Jim Shorney writes: Quote from another forum: I bought a radio so I could talk to other people =
on the radio about the radio I just bought.=20 Oh come on Mr Grumpy, the C-7 finally met its soul mate. That deserves a picture :-) --lyndon
|
Quote from another forum: I bought a radio so I could talk to other people on the radio about the radio I just bought. 73 -Jim NU0C On Sun, 10 Mar 2024 11:12:29 -0700 "Lyndon VE7TFX" <lyndon@...> wrote: About 18 months ago, when I acquired the mythical C-7 console,
I predicted a TR-7 was in my future if I did not find a C-4
replacement front panel.
It turns out I was right :-)
--lyndon
|
Re: Drake L7 grid/voltage meter
If anyone is interested, "ice blue" LEDs are now available that are a good match for the correct Drake aqua blue gels. I recently used one in my TR5 to replace a #53 lamp. LEDs surround the top bayonet like a turret and in the TR5 it results in even lighting across the meter scale.
Paul, W9AC
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Jim Shorney Sent: Sunday, March 10, 2024 2:01 PM To: [email protected]Subject: Re: [DRAKE-RADIO] Drake L7 grid/voltage meter I could try that I suppose. I have some cool whites somewhere. This one is pretty bad. Attached pic is with warm whites behind. Before anyone says anything, the meter is off-scale left due to a static charge. After I let it dissipate the meter works fine. 73 -Jim NU0C On Sun, 10 Mar 2024 10:29:17 -0700 "Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote: I have an outlier L7: one meter is normal and the other is "yellowy" I have reduced the apparent difference by using a "warm white" LED behind the normal one and a "white" LED bulb behind the yellow one.
My L7 has the blue filters in front of the meters and the later meters, so it's all with the meter scales.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with [Proton Mail]() secure email.
On Sunday, March 10th, 2024 at 12:38 PM, Bill Leonard N0CU <billincolo73@...> wrote:
Mark,
If you don't get any responses, I think that I still have a copy of the program that was on the software CD that came with the ARRL Handbook years ago. It allows you to print a new scale for any meter by simply entering in the basics parameters. The program no longer comes with the ARRL handbooks. It was developed for Win7, so I don't know if it will work on later Windows systems. Let me know if you are interested.
Bill N0CU
On Sat, Mar 9, 2024 at 10:33?PM Mark via groups.io <el34guy@...> wrote:
Hello,
Can anyone print me off a white copy of this meter scale from the L7 so I can replace my yellow version? I'm not sure if it needs to be on paper or plastic? Thanks, 73
Mark
W0NCL
Sent from my Verizon, Samsung Galaxy smartphone
-- 73 -Jim NU0C
|
Re: Latest problem with RV-75
No, L211 and L212 would not do that. They are parallel resonant circuits to peak the third harmonic of the crystal. They will not change the frequency. Apparently you are missing the 10 Hz steps. From the manual, the 8-bit D-A converter handles the two least significant bits of the BCD frequency data bits. That would be the 10 Hz steps. "The 8-bit converter can generate 100 different voltages corresponding to 00 thru [sic] 99 BCD". This voltage is applied to the varactor CR216 in the VCXO circuit. After all the multiplying, mixing, and prescaling this becomes the 10 Hz steps in the output. Adjustments of R227 and R228 are critical for this. Check the DC voltage on pin 8 of P202. It should move in steps as you slowly tune from xxxx.0 to xxxx.1, then go back to where it started. It looks like it should step between 0 and +9V. If you see steps as you tune slowly through 100 Hz the problem is in the VCXO crystal circuit. If you don't see it moving check pin 1 of P106 on the digital board for the same voltage (note that the pins are numbered backwards on the schematic from the pins of P202). If you are not seeing the stepping there that indicates a problem in the 8-bit D-A. It's a pretty simple circuit but it's easier to post a pic than to list all the parts. It's a bunch of logic buffers feeding into a cleverly crafted voltage divider network. I would think that the failure of any one chip would not render it completely useless so I suspect your problem lies elsewhere. Note that this whole thing is unexplored territory for me. I believe the above is a correct analysis but I could be wrong. :) 73 -Jim NU0C On Sat, 09 Mar 2024 20:19:59 -0800 "K6OXN Bob" <bobk6oxn@...> wrote: Just finished the full alignment.? All frequencies and voltages look great. The only problem is that when tuning, I cannot get the 100khz digit on the TR7 to increment and then it will advance by 1khz.? Annoying at least but the 10x probe proved to be the main culprit.? Now to set down with the schematic and see where I went wrong with the tuning so that the 100hz digit increments correctly. I use my RV-7 and it increments properly with it, so the TR7 is working as it should. I suspect that one of the signal voltage adjustments is wrong or on the edge. It will work out and I enjoy a good challenge.? RV-75 looks good and it is right on freq with WWV and some of the nets I get on.? I still suspect L211 and L212 is the problem although the signal is right at spec.? Thanks everyone for the hints and assistance.
73? Bob
-- 73 -Jim NU0C
|
About 18 months ago, when I acquired the mythical C-7 console,
I predicted a TR-7 was in my future if I did not find a C-4
replacement front panel.
It turns out I was right :-)
--lyndon
|
L7 filament choke connections
Since today is apparently fun with L7 pictures day, I thought I would post this. L7 owners, you may want to check your filament choke connections occasionally. These are images from the amp with the multicolored meters.
Also documented by Ham Repair guy on the internet.
--
73
-Jim
NU0C
|
Re: Drake L7 grid/voltage meter
I could try that I suppose. I have some cool whites somewhere. This one is pretty bad. Attached pic is with warm whites behind. Before anyone says anything, the meter is off-scale left due to a static charge. After I let it dissipate the meter works fine. 73 -Jim NU0C On Sun, 10 Mar 2024 10:29:17 -0700 "Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote: I have an outlier L7: one meter is normal and the other is "yellowy" I have reduced the apparent difference by using a "warm white" LED behind the normal one and a "white" LED bulb behind the yellow one.
My L7 has the blue filters in front of the meters and the later meters, so it's all with the meter scales.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with [Proton Mail]() secure email.
On Sunday, March 10th, 2024 at 12:38 PM, Bill Leonard N0CU <billincolo73@...> wrote:
Mark,
If you don't get any responses, I think that I still have a copy of the program that was on the software CD that came with the ARRL Handbook years ago. It allows you to print a new scale for any meter by simply entering in the basics parameters. The program no longer comes with the ARRL handbooks. It was developed for Win7, so I don't know if it will work on later Windows systems. Let me know if you are interested.
Bill N0CU
On Sat, Mar 9, 2024 at 10:33?PM Mark via groups.io <el34guy@...> wrote:
Hello,
Can anyone print me off a white copy of this meter scale from the L7 so I can replace my yellow version? I'm not sure if it needs to be on paper or plastic? Thanks, 73
Mark
W0NCL
Sent from my Verizon, Samsung Galaxy smartphone
-- 73 -Jim NU0C
|
Re: Drake L7 grid/voltage meter
And attached are two de-yellowed images, 24 BPP and 1 BPP. Either would look good printed actual size. 73 -Jim NU0C On Sun, 10 Mar 2024 10:27:40 -0700 "Jim Shorney via groups.io" <jimNU0C@...> wrote: OK Guys, STOP. We have a good image of the scale. Mark just needs someone to PRINT it to scale for this amp!
73
-Jim
NU0C
On Sun, 10 Mar 2024 09:38:05 -0700
"Bill Leonard N0CU" <billincolo73@...> wrote:
Mark,
If you don't get any responses, I think that I still have a copy of the
program that was on the software CD that came with the ARRL Handbook years
ago. It allows you to print a new scale for any meter by simply entering in
the basics parameters. The program no longer comes with the ARRL handbooks.
It was developed for Win7, so I don't know if it will work on later Windows
systems. Let me know if you are interested.
Bill N0CU
On Sat, Mar 9, 2024 at 10:33?PM Mark via groups.io <el34guy=
[email protected]> wrote:
Hello,
Can anyone print me off a white copy of this meter scale from the L7 so I
can replace my yellow version? I'm not sure if it needs to be on paper or
plastic? Thanks, 73
Mark
W0NCL
Sent from my Verizon, Samsung Galaxy smartphone
-- 73 -Jim NU0C
|
Re: Drake L7 grid/voltage meter
I have an outlier L7: one meter is normal and the other is "yellowy"? I have reduced the apparent difference by using a "warm white" LED behind the normal one and a "white" LED bulb behind the yellow one.
My L7 has the blue filters in front of the meters and the later meters, so it's all with the meter scales.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Sunday, March 10th, 2024 at 12:38 PM, Bill Leonard N0CU <billincolo73@...> wrote:
Mark, If you don't get any responses, I think that I still have a copy of the program that was on the software CD that came with the ARRL Handbook years ago. It allows you to print a new scale for any meter by simply entering in the basics parameters. The program no longer comes with the ARRL handbooks. It was developed for Win7, so I don't know if it will work on later Windows systems. Let me know if you are interested. Bill N0CU
Hello,
Can anyone print me off a white copy of this meter scale from the L7 so I can replace my yellow version? I'm not sure if it needs to be on paper or plastic? Thanks, 73
Mark W0NCL
Sent from my Verizon, Samsung Galaxy smartphone
|
Re: Drake L7 grid/voltage meter
OK Guys, STOP. We have a good image of the scale. Mark just needs someone to PRINT it to scale for this amp! 73 -Jim NU0C On Sun, 10 Mar 2024 09:38:05 -0700 "Bill Leonard N0CU" <billincolo73@...> wrote: Mark,
If you don't get any responses, I think that I still have a copy of the
program that was on the software CD that came with the ARRL Handbook years
ago. It allows you to print a new scale for any meter by simply entering in
the basics parameters. The program no longer comes with the ARRL handbooks.
It was developed for Win7, so I don't know if it will work on later Windows
systems. Let me know if you are interested.
Bill N0CU
On Sat, Mar 9, 2024 at 10:33?PM Mark via groups.io <el34guy=
[email protected]> wrote:
Hello,
Can anyone print me off a white copy of this meter scale from the L7 so I
can replace my yellow version? I'm not sure if it needs to be on paper or
plastic? Thanks, 73
Mark
W0NCL
Sent from my Verizon, Samsung Galaxy smartphone
-- 73 -Jim NU0C
|
Richard,
What is it about those HP meters that have them listed on eBay for 3x more than what you can get a nice HP 8640B sig gen for?
Also, what is the input impedance of a good VTVM? I have tried using my HP 3479A multimeter, but even though it has a 10M input impedance it loads down many/most of the high impedance tube circuits that I have tried using it on.
Bill N0CU
On Sat, Mar 9, 2024 at 3:13?PM Richard Knoppow < 1oldlens1@...> wrote: ? ? I don't follow Mr. Carlson. It sounds like his super-probe is
nothing more than a signal tracer. Signal tracers were common service
instruments for years. An AC detector on a small audio amplifier with
built in speaker. You can trace a signal around in a set with one of
these. Usually also arranged to trace audio without a diode detector.
Next best to a scope.
? ? The 410B is a great meter, I like them better than the 410C. Be
careful to read the warning at the front of the handbook, the ground in
not isolated and you can zap yourself.
? ? BTW, the General Radio 1800A VTVM has a similar problem with the
case being hot in some connections.
On 3/9/2024 2:03 PM, Steve Wedge, W1ES/4 via wrote:
> Test equipment is another hobby that comes directly from the hobby of
> amateur radio.? I also worked in electronic hardware for decades and
> even in a metrology lab for a year or two.
>
> Now that I have finished the R-4C that was giving me such grief, I'm
> looking to getting my $5 ME-26 D/U working properly.? This is a VTVM
> that is the military version of the HP 410B, with an RF probe that can
> be accurate to 800 MHz.
>
> Steve Wedge, W1ES/4
>
> Time flies like an arrow.? Fruit flies like a banana.
>
> Sent with Proton Mail <> secure email.
>
> On Saturday, March 9th, 2024 at 4:04 PM, Michael Jensen
> <kavigal@...> wrote:
>> Three monitors is.. Awesome I can only agree on that as "It systems
>> specialist" == Keyboard basher..
>>
>> Funny you bring up Mr. Carlson, was checking my mail on the phone and
>> saw the first line in your reply... and was going to write to you
>> that, the "sound" i noticed was precisely what Mr.Carlson was tracing
>> with he's "Super probe" doohickey thingy thing..
>>
>> I have seriously considered he's probe, I do have the documentation,
>> but never got around to build one, that is that I never had the need..
>> Until now. Maybe when the day is 35 hours and not 24 hours.. One never
>> knows..
>>
>> /Michael - oz8abr
>>
>> On Sat, Mar 9, 2024 at 9:05?PM Steve Wedge, W1ES/4 via
>> <> <w1es=[email protected]
>> <mailto:[email protected]>> wrote:
>>
>>? ? ?Crackling sounds that affect the AGC (and thus cause the meter to
>>? ? ?deflect) are worthy of investigation. You may have a component
>>? ? ?that is either cracking (resistor) or has some intermittent
>>? ? ?dialectric issues (capacitor).
>>
>>? ? ?I have been promising myself that I would look into creating one
>>? ? ?of those "Mr. Carlson Super Probes". "Mr. Carlson's Lab" is on
>>? ? ?YouTube and he created an AC probe that can sniff out problems
>>? ? ?like internally arcing components. The probe is similar in concept
>>? ? ?to the old signal tracers but it is much more sensitive. I believe
>>? ? ?he has two versions: one with through-hole and the other using
>>? ? ?SMT. He demonstrated the probe on an old receiver that was showing
>>? ? ?"crackling" noises. and was able to find the bad cap within a few
>>? ? ?minutes.
>>
>>? ? ?Anyway, I scored another victory today: I figured out how to add a
>>? ? ?3rd monitor to the shack computer! More screen area -- yay!
>>
>>? ? ?73,
>>
>>? ? ?Steve Wedge, W1ES/4
>>
>>? ? ?Time flies like an arrow. Fruit flies like a banana.
>>
>>? ? ?Sent with Proton Mail <> secure email.
>>
>>? ? ?On Saturday, March 9th, 2024 at 1:14 PM, Michael Jensen
>>? ? ?<kavigal@... <mailto:kavigal@...>> wrote:
>>>? ? ?Well sorry for the slow reply, work just tend to take up too much
>>>? ? ?of one's spare time ;).
>>>? ? ?Sounds like a very nice trip you and XYL is planning, now I do
>>>? ? ?not travel much these days(I used to), now I just mainly work
>>>? ? ?from home and enjoy monitoring the HF bands, when 'Teams' decides
>>>? ? ?to leave me alone ;).
>>>
>>>? ? ?About that Beer.. Guess I already owe you one, at least as an
>>>? ? ?excuse to get myself one.
>>>
>>>? ? ?Been a few years since I was in Copenhagen, I live in the
>>>? ? ?opposite end of the country all the way up to the North about
>>>? ? ?50KM south of the most northern point..
>>>
>>>? ? ?And yes we will get to the bottom of this issue, actually I
>>>? ? ?notice something, when I turn on the radio 'ON' to "standby"
>>>? ? ?position the meters consequential "jumps" from ~S9+20 to the
>>>? ? ?S9+40 meter mark, first time I noticed I just though "ohh meter
>>>? ? ?is sticky" but then while troubleshooting I fiddled with the RF
>>>? ? ?gain and guess what?
>>>? ? ?No "sticky" meter when RF gain is fully cranked up quickly.
>>>
>>>? ? ?I noticed twice when "cold" starting the rig, and coinciding
>>>? ? ?"crackling" sound when the meter "jumped", not sure what the
>>>? ? ?right term is in English / U.S.A'ish but same sound a hot 6146B
>>>? ? ?tube can produce just not so pronounced.
>>>
>>>? ? ?It may not be related, just noticed it.. So.. status quo, really
>>>? ? ?eager to get that 12be6 swapped, but the mail man is apparently
>>>? ? ?on vacation in Hawaii current time.
>>>
>>>? ? ?/Michael.
>>>
>>>? ? ?On Thu, Mar 7, 2024 at 6:48?PM Steve Wedge, W1ES/4 via
>>>? ? ?<> <w1es=[email protected]
>>>? ? ?<mailto:[email protected]>> wrote:
>>>
>>>? ? ? ? ?Yeah, that's a shame that we still have such impediments. In
>>>? ? ? ? ?the grand scheme of things, a few 60 year old tubes are
>>>? ? ? ? ?nothing. If I was going to Demark this year, I'd pop a couple
>>>? ? ? ? ?in my bag and trade them for a beer but we will not be in the
>>>? ? ? ? ?area. We will be in HB9, DL, OE, OK, F, G, GW, GM and TF this
>>>? ? ? ? ?summer. My XYL is not a ham, so I'm not bringing any radios,
>>>? ? ? ? ?unfortunately :-) I mention this in case you're in any of
>>>? ? ? ? ?these areas in June or July.
>>>
>>>? ? ? ? ?In a couple years, perhaps, we will get to Scandinavia. I
>>>? ? ? ? ?worked in Copenhagen for a week long ago and have wanted to
>>>? ? ? ? ?tour that area.
>>>
>>>? ? ? ? ?We will get to the bottom of this.
>>>
>>>? ? ? ? ?73,
>>>
>>>? ? ? ? ?Steve Wedge, W1ES/4
>>>
>>>? ? ? ? ?Time flies like an arrow. Fruit flies like a banana.
>>>
>>>? ? ? ? ?Sent with Proton Mail <> secure email.
>>>
>>>? ? ? ? ?On Thursday, March 7th, 2024 at 12:26 PM, Michael Jensen
>>>? ? ? ? ?<kavigal@... <mailto:kavigal@...>> wrote:
>>>>? ? ? ? ?Steve, I'd love the approach of shotgunning, but nope I do
>>>>? ? ? ? ?not have a complete set.
>>>>
>>>>? ? ? ? ?I do have 2x12ba6 in the mail and 1 12be6 also in the mail,
>>>>? ? ? ? ?so that will be the starting point.
>>>>
>>>>? ? ? ? ?I did consider and I'd love to get a complete set from
>>>>? ? ? ? ?K5SVC, but it would add more than 4 times
>>>>? ? ? ? ?the money I have in the R4B already, getting tubes from the
>>>>? ? ? ? ?US to Europe is .. insane..
>>>>? ? ? ? ?So thank you to the Danish Government ;)
>>>>
>>>>? ? ? ? ?Anyways, will try the three tube change first, that's kinda
>>>>? ? ? ? ?where I'm at now.
>>>>
>>>>? ? ? ? ?/Michael
>>>>
>>>>? ? ? ? ?On Thu, Mar 7, 2024 at 5:33?PM Steve Wedge, W1ES/4 via
>>>>? ? ? ? ? <> <w1es=[email protected]
>>>>? ? ? ? ?<mailto:[email protected]>> wrote:
>>>>
>>>>? ? ? ? ? ? ?Now is the time, if you either have a spare set or have
>>>>? ? ? ? ? ? ?another R-4B, to swap every tube out at the same time
>>>>? ? ? ? ? ? ?(¡°²õ³ó´Ç³Ù²µ³Ü²Ô²Ô¾±²Ô²µ¡±).
>>>>
>>>>? ? ? ? ? ? ?I had an R-4B that was vexing me to no end until I
>>>>? ? ? ? ? ? ?replaced all the tubes and then put swapped the old ones
>>>>? ? ? ? ? ? ?back, one at a time. I found two bad/gassy 12BA6¡¯s and a
>>>>? ? ? ? ? ? ?12BE6 that passed the tube tester but was no good.
>>>>
>>>>? ? ? ? ? ? ?Steve Wedge, W1ES/4
>>>>
>>>>? ? ? ? ? ? ?Time flies like an arrow. Fruit flies like a banana.
>>>>
>>>>
>>>>? ? ? ? ? ? ?Sent from Proton Mail <> for iOS
>>>>
>>>>
>>>>? ? ? ? ? ? ?On Thu, Mar 7, 2024 at 09:29, Michael Jensen
>>>>? ? ? ? ? ? ?<kavigal@...
>>>>? ? ? ? ? ? ?<mailto:On+Thu,+Mar+7,+2024+at+09:29,+Michael+Jensen+%3C%3Ca+href=>> wrote:
>>>>>? ? ? ? ? ? ?When unpowered, S1+a hair, so very close to zero.
>>>>>
>>>>>? ? ? ? ? ? ?Have checked the following resistors so fare...
>>>>>? ? ? ? ? ? ?Just FYI, nothing more..
>>>>>? ? ? ? ? ? ?R9 1.5K** Board 9 OK
>>>>>? ? ? ? ? ? ?R8 220K** Chassis Right Side -R OK
>>>>>? ? ? ? ? ? ?R12 1.5k**Board 9 OK
>>>>>? ? ? ? ? ? ?R13 1.5K**Board 9 OK
>>>>>? ? ? ? ? ? ?R16 1.5K**Board 7 OK
>>>>>? ? ? ? ? ? ?R17 12K* OK
>>>>>? ? ? ? ? ? ?R24 18K* OK
>>>>>
>>>>>? ? ? ? ? ? ?R136 1k** Chassis Left Side -R OK
>>>>>? ? ? ? ? ? ?R142 4.7K**Board 3 OK
>>>>>? ? ? ? ? ? ?R146 22K** Board 3 -- coil OK
>>>>>
>>>>>? ? ? ? ? ? ?/Michael.
>>>>>
>>>>>? ? ? ? ? ? ?On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via
>>>>>? ? ? ? ? ? ? <>
>>>>>? ? ? ? ? ? ?<w1es=[email protected]
>>>>>? ? ? ? ? ? ?<mailto:[email protected]>> wrote:
>>>>>
>>>>>? ? ? ? ? ? ? ? ?Yes, I have been bit by one of the meter terminals.
>>>>>? ? ? ? ? ? ? ? ?It hurts :-). This circuit is at around 150V
>>>>>? ? ? ? ? ? ? ? ?potential.
>>>>>
>>>>>? ? ? ? ? ? ? ? ?Steve Wedge, W1ES/4
>>>>>
>>>>>? ? ? ? ? ? ? ? ?Time flies like an arrow. Fruit flies like a banana.
>>>>>
>>>>>
>>>>>? ? ? ? ? ? ? ? ?Sent from Proton Mail <>
>>>>>? ? ? ? ? ? ? ? ?for iOS
>>>>>
>>>>>
>>>>>? ? ? ? ? ? ? ? ?On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT
>>>>>? ? ? ? ? ? ? ? ?<glenn.mh.dk@...
>>>>>? ? ? ? ? ? ? ? ?<mailto:On+Thu,+Mar+7,+2024+at+01:23,+Glenn,+OZ1HFT+%3C%3Ca+href=>> wrote:
>>>>>>? ? ? ? ? ? ? ? ?Hi Michael
>>>>>>
>>>>>>? ? ? ? ? ? ? ? ?More safety: Let the Drake unlugged power plug and
>>>>>>? ? ? ? ? ? ? ? ?cable be visible to you, on your workbench, while
>>>>>>? ? ? ? ? ? ? ? ?you work on the Drake.
>>>>>>
>>>>>>? ? ? ? ? ? ? ? ?(Then it be much harder to get an accidently
>>>>>>? ? ? ? ? ? ? ? ?electric shock.)
>>>>>>
>>>>>>? ? ? ? ? ? ? ? ?--
>>>>>>? ? ? ? ? ? ? ? ?best regards,
>>>>>>
>>>>>>? ? ? ? ? ? ? ? ?Glenn, OZ1HFT
>>>>>
>>>
>>
>
>
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Re: Drake L7 grid/voltage meter
Mark, If you don't get any responses, I think that I still have a copy of the program that was on the software CD that came with the ARRL Handbook years ago. It allows you to print a new scale for any meter by simply entering in the basics parameters. The?program no longer comes with the ARRL handbooks. It was developed for?Win7, so I don't know if it will work on later Windows systems. Let me know if you are interested. Bill N0CU
Hello,
Can anyone print me off a white copy of this meter scale from the L7 so I can replace my yellow version? I'm not sure if it needs to be on paper or plastic? Thanks, 73
Mark? W0NCL?
Sent from my Verizon, Samsung Galaxy smartphone
|
Congrats. The Alphas, generally speaking, are more robust amps. Although you do have to take better care of the grids in those metal triodes. 73 -Jim NU0C On Sun, 10 Mar 2024 06:34:23 -0700 "K8CCA" <echapm4@...> wrote: Hey guys, didn't buy the L7, but came home with a Alpha 87A. Was a great
price and I could not pass it up.
|
Re: Drake L7 grid/voltage meter
Mark:
I have to wonder what causes SOME L-7 meters to discolor this way?? Back in the early 90's, after getting my 1st L-7, I found a bunch of spare parts for sale which included a brand new pair of meters for the L-7.? They were nice and white at that time.? They arrived wrapped in paper towels, inside a box, and were stored by me inside another cardboard box...in other words, there was no way any sunlight could get in there and do that.? Years later, I pulled them out to see what was in the box and discovered the scales had yellowed....not quite as badly as yours...but maybe 60-70% of that?? ?I sold off one of the L-7's years ago and it's been through two owners since, both of whom I still keep in touch with and both L-7's do not exhibit any?yellowing?of the scales!
I wasn't too worried about it as the?meters were meant to be spare parts for the day I lose a meter in the L-7....which, fortunately, has yet to happen.? I can always use the scales in a defunct meter should that catastrophe occur...hopefully unlikely, now that the one L-7 I have has the protective diode mod now.
I made my own scales for my SR-2000 power supply, as they were yellowed badly, but the plastic meter housings were also yellowed.? No amount of Novus polish would completely remove the yellowing of the plastic, though it did help a lot.? I found two "same style" meters on Ebay for under $20 and made my own scales using the free "METER" program.? They were much simpler scales than the L-7 multimeter though.? Scales were printed with a laser printer on heavy 80 weight paper and spray glued to the originals.? They look really good.
Another option might be to see if RadioDaze could make new scales for you.? They are VERY good with graphic reproductions.? I have no idea what the initial setup charge would be but might be worth an inquiry.
73 Peter VE7PS
Hello,
Can anyone print me off a white copy of this meter scale from the L7 so I can replace my yellow version? I'm not sure if it needs to be on paper or plastic? Thanks, 73
Mark? W0NCL?
Sent from my Verizon, Samsung Galaxy smartphone
|
I have a very nice Drake L4B HF amplifier I would like to offer for sale. The amp is in very good condition. The amp has been upgraded with the Harbach ES4L4B Soft-Start/Soft -Key /Bias Module start boards. The amp power supply has been rebuilt with Harbach PM-400 Replacement Power Supply Module rebuild kit. The?amp will put out around 750 watts on CW and 1200 watts on SSB. I am selling because the amp is excess to my needs. It comes with a manual and a custom soft cover. I am asking $1300 OBO. Local pickup preferred I would prefer not to ship the amp and power supply and would help with delivery within 75 miles of zip code 18202. However any shipping and packing insurance will be at the purchaser¡¯s expense. The tubes and chimneys are very fragile and must be shipped separately. Please let me know if you have any questions. The amp and power supply are Sold as is with no warrantee.?
|
Hey guys, didn't buy the L7, but came home with a Alpha 87A. Was a great price and I could not pass it up.?
So I am going to sell my L4b. If anyone is looking for one it's been recapped with Harbach boards, and the soft start board as well. Looking for $1200 not to crazy about shipping it, but I will be at Dayton or of course could meet someone up to 60 miles from Grand Rapids, Michigan.?
On Fri, Mar 8, 2024, 3:46?PM Jim Shorney < jimNU0C@...> wrote:
If you keep your eyes and ears open you can get lucky. Sometimes extremely so. Back in the mid 80s I traded a $150 Diawa 2m HT for my NCL-2000. Cosmetically ugly but working to spec. Yes, the guy is still a friend of mine and I still have that amp. He was also? instrumental in one of my recent Alpha acquisitions.
73
-Jim
NU0C
On Fri, 08 Mar 2024 12:36:48 -0800
"Steve Toth via " <stoth47=[email protected]> wrote:
> I looked for a linear for a couple of years - I was looking for an ICOM 2KL (hard to find) with power supply.
> In the course of the search I saw Drake amps with power supplies at an average price of $1200.? I came to the conclusion $1200 was reasonable for both an amp and power supply in good cosmetic and operating condition, anything under $1200 was a good deal and anything over $1200 would have to be justified by excellent condition and how bad I wanted it.
> I ended up paying $1400 for a pristine amp and power supply that worked right out of the box with no problems out of CA.
> Your mileage (and desires) may vary.....?
> - Steve? W7SJT
>
> "Always look for a positive solution then Improvise, Adapt, and Overcome"
> - Adaptation of the U.S. Marine Corps motto
>
> "There are no rules here!...We're trying to accomplish something!!"
>
> - Thomas Edison
>
>
> "Success is not final, failure is not fatal.? It is the courage to continue that counts."
>
> -?Winston Churchill
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>? ? ?On Friday, March 8, 2024 at 01:11:59 PM MST, K8CCA <echapm4@...> wrote:?
>?
>? Thanks guys, great input.? I know it's been for sale for 2 years, so I knda figured it was a bit high.? He mentioned the Schulmann Auction, but the reality is that you need to pay to ship it there, and then give them 38% commission.? I will make an offer tomorrow as I was also thinking around 1200 was a fair price, and see what?happens.?
> It's supposed to have brand?new RFparts tubes and new caps.? I am unsure what else, but I rebuilt my L4B, so I assume I will recognize the insides.? Only issue is that I won't be able to plug it into 240V, so won't be able to verify the operation.??
>
> On the 30L-1 I bought one sans tubes at Dayton a few years ago for $100 as the guy told me it didn't have any HV after he put the Young Kim capacitor board in it and was sick of messing with?it.? It was in perfect condition,?so I figured I could fix it and risked it for that cheap.? I figured that the XFMR was toast, but was surprised?to find the HV Glitch resistor?tucked in around behind the XFMR and not connected to the board.? A quick solder job and it was fine.? Had another one given to me that had a grid to plate short from chinese crap 811s and after replacing a few parts, including the XFMR that I got from the CCA list a few months ago, it's working fine as well.? Don't really need the L7, but it would be nice to have the complete 7 line, so I will try to buy it.? Let you all know Saturday night when I get back.??
> Thanks again for the insight!??
> On Fri, Mar 8, 2024 at 2:49?PM jerry-KF6VB <jerry@...> wrote:
>
> On 2024-03-08 11:20, Jim Shorney wrote:
> > It is all relative. An Alpha 374A sold here recently at an estate sale
> > for $400.?
>
> *** And I saw - but didn't buy - a 30L-1 at the local ham swap for $180.
> ? ?It was missing one tube, and the meter glass was cracked,
> but otherwise in very nice cosmetic condition.? Still regret that,
> although
> I already have one of those :).
>
> ? ? ? ? ? ? ? ? ? ? ?- Jerry, KF6VB
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--
73
-Jim
NU0C
|
Drake L7 grid/voltage meter
Hello,
Can anyone print me off a white copy of this meter scale from the L7 so I can replace my yellow version? I'm not sure if it needs to be on paper or plastic? Thanks, 73
Mark? W0NCL?
Sent from my Verizon, Samsung Galaxy smartphone
|
Re: Latest problem with RV-75
Just finished the full alignment.? All frequencies and voltages look great. The only problem is that when tuning, I cannot get the 100hz digit on the TR7 to increment and then it will advance by 1khz.? Annoying at least but the 10x probe proved to be the main culprit.? Now to set down with the schematic and see where I went wrong with the tuning so that the 100hz digit increments correctly. I use my RV-7 and it increments properly with it, so the TR7 is working as it should. I suspect that one of the signal voltage adjustments is wrong or on the edge. It will work out and I enjoy a good challenge.? RV-75 looks good and it is right on freq with WWV and some of the nets I get on.? I still suspect L211 and L212 is the problem although the signal is right at spec.? Thanks everyone for the hints and assistance.
73? Bob
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I don't follow Mr. Carlson. It sounds like his super-probe is nothing more than a signal tracer. Signal tracers were common service instruments for years. An AC detector on a small audio amplifier with built in speaker. You can trace a signal around in a set with one of these. Usually also arranged to trace audio without a diode detector. Next best to a scope.
The 410B is a great meter, I like them better than the 410C. Be careful to read the warning at the front of the handbook, the ground in not isolated and you can zap yourself.
BTW, the General Radio 1800A VTVM has a similar problem with the case being hot in some connections.
toggle quoted message
Show quoted text
On 3/9/2024 2:03 PM, Steve Wedge, W1ES/4 via groups.io wrote: Test equipment is another hobby that comes directly from the hobby of amateur radio.? I also worked in electronic hardware for decades and even in a metrology lab for a year or two.
Now that I have finished the R-4C that was giving me such grief, I'm looking to getting my $5 ME-26 D/U working properly.? This is a VTVM that is the military version of the HP 410B, with an RF probe that can be accurate to 800 MHz.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with Proton Mail <> secure email.
On Saturday, March 9th, 2024 at 4:04 PM, Michael Jensen <kavigal@...> wrote:
Three monitors is.. Awesome I can only agree on that as "It systems specialist" == Keyboard basher..
Funny you bring up Mr. Carlson, was checking my mail on the phone and saw the first line in your reply... and was going to write to you that, the "sound" i noticed was precisely what Mr.Carlson was tracing with he's "Super probe" doohickey thingy thing..
I have seriously considered he's probe, I do have the documentation, but never got around to build one, that is that I never had the need.. Until now. Maybe when the day is 35 hours and not 24 hours.. One never knows..
/Michael - oz8abr
On Sat, Mar 9, 2024 at 9:05?PM Steve Wedge, W1ES/4 via groups.io <> <w1es@... <mailto:[email protected]>> wrote:
Crackling sounds that affect the AGC (and thus cause the meter to
deflect) are worthy of investigation. You may have a component
that is either cracking (resistor) or has some intermittent
dialectric issues (capacitor).
I have been promising myself that I would look into creating one
of those "Mr. Carlson Super Probes". "Mr. Carlson's Lab" is on
YouTube and he created an AC probe that can sniff out problems
like internally arcing components. The probe is similar in concept
to the old signal tracers but it is much more sensitive. I believe
he has two versions: one with through-hole and the other using
SMT. He demonstrated the probe on an old receiver that was showing
"crackling" noises. and was able to find the bad cap within a few
minutes.
Anyway, I scored another victory today: I figured out how to add a
3rd monitor to the shack computer! More screen area -- yay!
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with Proton Mail <> secure email.
On Saturday, March 9th, 2024 at 1:14 PM, Michael Jensen
<kavigal@... <mailto:kavigal@...>> wrote:
Well sorry for the slow reply, work just tend to take up too much
of one's spare time ;).
Sounds like a very nice trip you and XYL is planning, now I do
not travel much these days(I used to), now I just mainly work
from home and enjoy monitoring the HF bands, when 'Teams' decides
to leave me alone ;).
About that Beer.. Guess I already owe you one, at least as an
excuse to get myself one.
Been a few years since I was in Copenhagen, I live in the
opposite end of the country all the way up to the North about
50KM south of the most northern point..
And yes we will get to the bottom of this issue, actually I
notice something, when I turn on the radio 'ON' to "standby"
position the meters consequential "jumps" from ~S9+20 to the
S9+40 meter mark, first time I noticed I just though "ohh meter
is sticky" but then while troubleshooting I fiddled with the RF
gain and guess what?
No "sticky" meter when RF gain is fully cranked up quickly.
I noticed twice when "cold" starting the rig, and coinciding
"crackling" sound when the meter "jumped", not sure what the
right term is in English / U.S.A'ish but same sound a hot 6146B
tube can produce just not so pronounced.
It may not be related, just noticed it.. So.. status quo, really
eager to get that 12be6 swapped, but the mail man is apparently
on vacation in Hawaii current time.
/Michael.
On Thu, Mar 7, 2024 at 6:48?PM Steve Wedge, W1ES/4 via groups.io
<> <w1es@...
<mailto:[email protected]>> wrote:
Yeah, that's a shame that we still have such impediments. In
the grand scheme of things, a few 60 year old tubes are
nothing. If I was going to Demark this year, I'd pop a couple
in my bag and trade them for a beer but we will not be in the
area. We will be in HB9, DL, OE, OK, F, G, GW, GM and TF this
summer. My XYL is not a ham, so I'm not bringing any radios,
unfortunately :-) I mention this in case you're in any of
these areas in June or July.
In a couple years, perhaps, we will get to Scandinavia. I
worked in Copenhagen for a week long ago and have wanted to
tour that area.
We will get to the bottom of this.
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with Proton Mail <> secure email.
On Thursday, March 7th, 2024 at 12:26 PM, Michael Jensen
<kavigal@... <mailto:kavigal@...>> wrote:
Steve, I'd love the approach of shotgunning, but nope I do
not have a complete set.
I do have 2x12ba6 in the mail and 1 12be6 also in the mail,
so that will be the starting point.
I did consider and I'd love to get a complete set from
K5SVC, but it would add more than 4 times
the money I have in the R4B already, getting tubes from the
US to Europe is .. insane..
So thank you to the Danish Government ;)
Anyways, will try the three tube change first, that's kinda
where I'm at now.
/Michael
On Thu, Mar 7, 2024 at 5:33?PM Steve Wedge, W1ES/4 via
groups.io <> <w1es@...
<mailto:[email protected]>> wrote:
Now is the time, if you either have a spare set or have
another R-4B, to swap every tube out at the same time
(¡°²õ³ó´Ç³Ù²µ³Ü²Ô²Ô¾±²Ô²µ¡±).
I had an R-4B that was vexing me to no end until I
replaced all the tubes and then put swapped the old ones
back, one at a time. I found two bad/gassy 12BA6¡¯s and a
12BE6 that passed the tube tester but was no good.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail <> for iOS
On Thu, Mar 7, 2024 at 09:29, Michael Jensen
<kavigal@...
<mailto:On+Thu,+Mar+7,+2024+at+09:29,+Michael+Jensen+%3C%3Ca+href=>> wrote:
When unpowered, S1+a hair, so very close to zero.
Have checked the following resistors so fare...
Just FYI, nothing more..
R9 1.5K** Board 9 OK
R8 220K** Chassis Right Side -R OK
R12 1.5k**Board 9 OK
R13 1.5K**Board 9 OK
R16 1.5K**Board 7 OK
R17 12K* OK
R24 18K* OK
R136 1k** Chassis Left Side -R OK
R142 4.7K**Board 3 OK
R146 22K** Board 3 -- coil OK
/Michael.
On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via
groups.io <>
<w1es@...
<mailto:[email protected]>> wrote:
Yes, I have been bit by one of the meter terminals.
It hurts :-). This circuit is at around 150V
potential.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail <>
for iOS
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT
<glenn.mh.dk@...
<mailto:On+Thu,+Mar+7,+2024+at+01:23,+Glenn,+OZ1HFT+%3C%3Ca+href=>> wrote:
Hi Michael
More safety: Let the Drake unlugged power plug and
cable be visible to you, on your workbench, while
you work on the Drake.
(Then it be much harder to get an accidently
electric shock.)
--
best regards,
Glenn, OZ1HFT
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
Test equipment is another hobby that comes directly from the hobby of amateur radio.? I also worked in electronic hardware for decades and even in a metrology lab for a year or two.
Now that I have finished the R-4C that was giving me such grief, I'm looking to getting my $5 ME-26 D/U working properly.? This is a VTVM that is the military version of the HP 410B, with an RF probe that can be accurate to 800 MHz.
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Saturday, March 9th, 2024 at 4:04 PM, Michael Jensen <kavigal@...> wrote:
Three monitors is.. Awesome I can only agree on that as "It systems specialist" == Keyboard basher..
Funny you bring up Mr. Carlson, was checking my mail on the phone and saw the first line in your reply... and was going to write to you that, the "sound" i noticed was precisely what Mr.Carlson was tracing with he's "Super probe" doohickey thingy thing..
I have seriously considered he's probe, I do have the documentation, but never got around to build one, that is that I never had the need.. Until now. Maybe when the day is 35 hours and not 24 hours.. One never knows..
/Michael - oz8abr
On Sat, Mar 9, 2024 at 9:05?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Crackling sounds that affect the AGC (and thus cause the meter to deflect) are worthy of investigation. You may have a component that is either cracking (resistor) or has some intermittent dialectric issues (capacitor).
I have been promising myself that I would look into creating one of those "Mr. Carlson Super Probes". "Mr. Carlson's Lab" is on YouTube and he created an AC probe that can sniff out problems like internally arcing components. The probe is similar in concept to the old signal tracers but it is much more sensitive. I believe he has two versions: one with through-hole and the other using SMT. He demonstrated the probe on an old receiver that was showing "crackling" noises. and was able to find the bad cap within a few minutes.
Anyway, I scored another victory today: I figured out how to add a 3rd monitor to the shack computer! More screen area -- yay!
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Saturday, March 9th, 2024 at 1:14 PM, Michael Jensen < kavigal@...> wrote:
Well sorry for the slow reply, work just tend to take up too much of one's spare time ;). Sounds like a very nice trip you and XYL is planning, now I do not travel much these days(I used to), now I just mainly work from home and enjoy monitoring the HF bands, when 'Teams' decides to leave me alone ;).
About that Beer.. Guess I already owe you one, at least as an excuse to get myself one.
Been a few years since I was in Copenhagen, I live in the opposite end of the country all the way up to the North about 50KM south of the most northern point..
And yes we will get to the bottom of this issue, actually I notice something, when I turn on the radio 'ON' to "standby" position the meters consequential "jumps" from ~S9+20 to the S9+40 meter mark, first time I noticed I just though "ohh meter is sticky" but then while troubleshooting I fiddled with the RF gain and guess what? No "sticky" meter when RF gain is fully cranked up quickly.
I noticed twice when "cold" starting the rig, and coinciding "crackling" sound when the meter "jumped", not sure what the right term is in English / U.S.A'ish but same sound a hot 6146B tube can produce just not so pronounced.
It may not be related, just noticed it.. So.. status quo, really eager to get that 12be6 swapped, but the mail man is apparently on vacation in Hawaii current time.
/Michael.
On Thu, Mar 7, 2024 at 6:48?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Yeah, that's a shame that we still have such impediments. In the grand scheme of things, a few 60 year old tubes are nothing. If I was going to Demark this year, I'd pop a couple in my bag and trade them for a beer but we will not be in the area. We will be in HB9, DL, OE, OK, F, G, GW, GM and TF this summer. My XYL is not a ham, so I'm not bringing any radios, unfortunately :-) I mention this in case you're in any of these areas in June or July.
In a couple years, perhaps, we will get to Scandinavia. I worked in Copenhagen for a week long ago and have wanted to tour that area.
We will get to the bottom of this.
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Thursday, March 7th, 2024 at 12:26 PM, Michael Jensen < kavigal@...> wrote:
Steve, I'd love the approach of shotgunning, but nope I do not have a complete set.
I do have 2x12ba6 in the mail and 1 12be6 also in the mail, so that will be the starting point.
I did consider and I'd love to get a complete set from K5SVC, but it would add more than 4 times
the money I have in the R4B already, getting tubes from the US to Europe is .. insane..
So thank you to the Danish Government ;)
Anyways, will try the three tube change first, that's kinda where I'm at now.
/Michael
On Thu, Mar 7, 2024 at 5:33?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Now is the time, if you either have a spare set or have another R-4B, to swap every tube out at the same time (¡°²õ³ó´Ç³Ù²µ³Ü²Ô²Ô¾±²Ô²µ¡±).
I had an R-4B that was vexing me to no end until I replaced all the tubes and then put swapped the old ones back, one at a time. I found two bad/gassy 12BA6¡¯s and a 12BE6 that passed the tube tester but was no good.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 09:29, Michael Jensen < kavigal@...> wrote: When unpowered, S1+a hair, so very close to zero.
Have checked the following resistors so fare... Just FYI, nothing more.. R9 1.5K** Board 9 OK
R8 220K** Chassis Right Side -R OK
R12 1.5k**Board 9 OK
R13 1.5K**Board 9 OK
R16 1.5K**Board 7 OK
R17 12K* OK
R24 18K* OK
R136 1k** Chassis Left Side -R OK
R142 4.7K**Board 3 OK
R146 22K** Board 3 -- coil OK
/Michael.
On Thu, Mar 7, 2024 at 3:19?PM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Yes, I have been bit by one of the meter terminals. It hurts :-). This circuit is at around 150V potential.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Thu, Mar 7, 2024 at 01:23, Glenn, OZ1HFT < glenn.mh.dk@...> wrote: Hi Michael
More safety: Let the Drake unlugged power plug and cable be visible to you, on your workbench, while you work on the Drake.
(Then it be much harder to get an accidently electric shock.)
--
best regards,
Glenn, OZ1HFT
|
Jim Shorney
Paul Christensen
K8CCA
