Re: Mn2000 broken insulator
There are number of North American sources for Ceramic Standoff insulators.
?
Keystone Electronics (New York), Digi-Key & Mouser distributors
Standoffs: Ceramic Round?
?
LSP Ceramics (New Jersey)?
?
===
McMaster-Carr has a number of materials used as Round Standoff Insulators.
I previously noted Phenolic, as one material.
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Re: Another source for MN-2000 broken insulator
McMaster-Carr has a Wide selection of Phenolic Round Tubes, that can be Cut to desired length for replacement with the Drake MN-2000 tuner.
?
Search for Garolite Phenolic.
===
?
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Looking for Recapped DRAKE AC-4
Hi Folks
?
i am looking for recapped, and in a good cosmetic shape, Drake AC-4, Eu Only (no tax) Please.
?
Please Contact me via email : ik1qhb@... or via whatsapp 0039 348 6918831 ?
Many Thanks
?
Paul IK1QHB
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Tim,
Carbon composition resistors typically increase in value over time due to absorbing moisture.?
That is the reason the voltage divider network resistance has increased causing the voltage to read low.?
Military spec publications identified this a long time ago and Allen Bradley recommended taking the resistors and putting them in an oven at 150F for 5 days to return them to spec.?
Naturally in your case it makes more sense to just replace them if you cannot adjust it with the potentiometer, after all, that¡¯s why it¡¯s there. ?
toggle quoted message
Show quoted text
On Jan 7, 2025, at 10:47?PM, amfone via groups.io <amfone20000@...> wrote:
?
OK sorry for the mistake I used the term in reference to the meter not reading correctly.
73 Tim
WB8UHZ
On Tuesday, January 7, 2025 at 10:55:56 PM EST, Jim Shorney via groups.io <jimnu0c@...> wrote:
OK but please stop calling them shunts. They are series voltage dropping resistors. The only shunt is the pot. A shunt is a resistance across the meter terminals to increase the current value needed for a full scale reading.
On Wed, 8 Jan 2025 03:38:34 +0000 (UTC)
"amfone via groups.io" <amfone20000@...> wrote:
>? Jim thanks for your help regarding the location and the voltage requirements of the shunts.
--
73
-Jim
NU0C
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Re: Anyone have an R4B dial?
Pat,
?
I have the complete Drake 4B PTO, smooth rotating Gearing System, and clean, not discolored, dial.
I can provide you with a few pictures.
?
If you are interested contact me off group at my email address below.
?
mikew5rkl at gmail dot com
?
73
Mike W5RKL
?
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Re: Anyone have an R4B dial?
Well, no help here but I can add that the dial on my R4B is also toasted.? The dial on my T4XB is fine,? wa4tuk
It may have been. The owner had such great expectations when he sent the rig and all the new parts to me but he bought them so I don¡¯t have any receipts.?
73,
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Tue, Jan 7, 2025 at 23:04, Michael Smith via < tw8kcabpilot@...> wrote:
Steve,
?
Are the dials you have seen made by Radio Daze, perhaps?
?
73,
Michael Smith, N4KZO
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Re: 6HS6 Price and Availability
I hadn't noticed the high prices for the 6HS6 until this thread. Ouch!
?
My R-4A came with a gassy 6HS6, among a few other tubes, so when I checked my stock and the substitution chart I used a 6136 (6AU6) for V8, the premixer, and the radio works fine.
?
After this post, I just checked the filament voltages and the 12.6V line measures 12.6VAC, and at the socket of V8 it shows 6.29VAC. So the missing 150mA of heater current doesn't seem to be bothering the 6EH5.
?
But having a few radios that use this tube I guess I should start looking for a spare. I see a few used ones that are labeled "Fisher" so that may be the problem... the audiophiles have sucked them up.
?
Dave
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Re: 6HS6 Price and Availability
Well, first the truth will vary.? Tubes are generally not mass produced anymore.? Those that are, are generally Chinese and for specific markets and use.? The 6SH6 tubes are likely not to be new so the stock value is directly proportional to the number available.? So, if a vendor has many of this tube type, they may tend to be cheaper per unit than a vendor that has but a few.? Hamfests are sometimes a good source?of tubes, but at times I have been surprised?that a New tube was essentially not new, but well used in a new looking box.?? In any case and regardless of the source, you should check the tube with a known reliable tube checker before inserting them into the radio.
Good luck. David Assaf III W5XU, VP8RXU ?
On Tue, Jan 7, 2025 at 10:23?PM Michael Smith via <tw8kcabpilot= [email protected]> wrote: Okay, so I know there has been a lot of discussion about the cost of these tubes.? They are a relatively high transconductance IF amplifier tube ¡ª so what?? I priced these tubes today from roughly $38 to $60, EACH.? Come on folks, are these tubes really that rare and unique, or has somebody found a way to inflate the price to make a big quick-profit.? I¡¯ve heard these stories of, ¡°Oh, tubes are getting scarce.¡± ? (The sky is falling, the sky is falling!) ?Then when one checks, well, the sky isn¡¯t actually falling, and there are LOTS of good NOS tubes available.? I would like to run a B-line without the inflation manipulation.? How often do these tubes need to be replaced, by experience (not rumor)?? Please, I would like to know the truth about what¡¯s going on with the 6HS6 vacuum tube.? Why are they priced so high?
?
Thank you.
?
73, Michael Smith, N4KZO
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Re: 6HS6 Price and Availability
Although they have been expensive for as long as I can remember, there is, I believe, an audiophile connection involved. I can remember seeing $15 prices in them as far back as the 90s.?
I am also in agreement with the 6AH6 being a replacement. There are loads of them at hamfests for $2-3 and I see them on the tube sellers¡¯ sites for $5 or so.?
And yes, this is how the free market works when it is un-messed with. I have a supply of them and it would cost me $45 to replace one so that is what I charge for them, as well.?
73,
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Wed, Jan 8, 2025 at 00:44, jerry-KF6VB < jerry@...> wrote: Could the 6HS6 suffer from audiophile interest?
- Jerry, KF6VB
On 2025-01-07 20:22, Michael Smith via groups.io wrote:
> Okay, so I know there has been a lot of discussion about the cost of
> these tubes. They are a relatively high transconductance IF amplifier
> tube -- so what? I priced these tubes today from roughly $38 to $60,
> EACH. Come on folks, are these tubes really _that_ rare and unique,
> or has somebody found a way to inflate the price to make a big
> quick-profit. I've heard these stories of, "Oh, tubes are getting
> scarce." (The sky is falling, the sky is falling!) Then when one
> checks, well, the sky isn't actually falling, and there are LOTS of
> good NOS tubes available. I would like to run a B-line without the
> inflation manipulation. How often do these tubes need to be replaced,
> by experience (not rumor)? Please, I would like to know the truth
> about what's going on with the 6HS6 vacuum tube. Why are they priced
> so high?
>
> Thank you.
>
> 73, Michael Smith, N4KZO
>
>
> Links:
> ------
> [1] /g/DRAKE-RADIO/message/81735
> [2] /mt/110491919/243852
> [3] /g/DRAKE-RADIO/post
> [4] /g/DRAKE-RADIO/editsub/243852
> [5]
> /g/DRAKE-RADIO/leave/12260778/243852/767576506/xyzzy
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Re: Anyone have an R4B dial?
It may have been. The owner had such great expectations when he sent the rig and all the new parts to me but he bought them so I don¡¯t have any receipts.?
73,
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
On Tue, Jan 7, 2025 at 23:04, Michael Smith via groups.io < tw8kcabpilot@...> wrote:
Steve,
?
Are the dials you have seen made by Radio Daze, perhaps?
?
73,
Michael Smith, N4KZO
|
Re: AFG/RFG controls R4C (W1ES)
Are you still using electricity?
On Tuesday, January 7, 2025 at 06:57:40 PM EST, N3 EG <n3eg@...> wrote:
I just jumpered the RFG and used an on/off/volume pot on my TR-3.? I never use the RFG on any radios I own.
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Re: 6HS6 Price and Availability
Could the 6HS6 suffer from audiophile interest?
- Jerry, KF6VB
toggle quoted message
Show quoted text
On 2025-01-07 20:22, Michael Smith via groups.io wrote: Okay, so I know there has been a lot of discussion about the cost of
these tubes. They are a relatively high transconductance IF amplifier
tube -- so what? I priced these tubes today from roughly $38 to $60,
EACH. Come on folks, are these tubes really _that_ rare and unique,
or has somebody found a way to inflate the price to make a big
quick-profit. I've heard these stories of, "Oh, tubes are getting
scarce." (The sky is falling, the sky is falling!) Then when one
checks, well, the sky isn't actually falling, and there are LOTS of
good NOS tubes available. I would like to run a B-line without the
inflation manipulation. How often do these tubes need to be replaced,
by experience (not rumor)? Please, I would like to know the truth
about what's going on with the 6HS6 vacuum tube. Why are they priced
so high?
Thank you.
73, Michael Smith, N4KZO
Links:
------
[1] /g/DRAKE-RADIO/message/81735
[2] /mt/110491919/243852
[3] /g/DRAKE-RADIO/post
[4] /g/DRAKE-RADIO/editsub/243852
[5] /g/DRAKE-RADIO/leave/12260778/243852/767576506/xyzzy
|
Re: 6HS6 Price and Availability
Michael;
I can't explain the high price of 6HS6's....maybe just basic economics - supply & demand?
But I can confirm that a 6AH6 used in place of the 6HS6 works just fine, at least in some spots in the R-4B and early R-4C's.
I have not done any real tests other than?just listening around the bands, and have not checked?all locations in each receiver either....but it would appear that if you lack a 6HS6, the much cheaper 6AH6 is worth a try.? I have not run out of 6HS6's yet, but the supply is getting low.??
73 and gl
Peter VE7PS
On Tue, Jan 7, 2025 at 8:22?PM Michael Smith via <tw8kcabpilot= [email protected]> wrote: Okay, so I know there has been a lot of discussion about the cost of these tubes.? They are a relatively high transconductance IF amplifier tube ¡ª so what?? I priced these tubes today from roughly $38 to $60, EACH.? Come on folks, are these tubes really that rare and unique, or has somebody found a way to inflate the price to make a big quick-profit.? I¡¯ve heard these stories of, ¡°Oh, tubes are getting scarce.¡± ? (The sky is falling, the sky is falling!) ?Then when one checks, well, the sky isn¡¯t actually falling, and there are LOTS of good NOS tubes available.? I would like to run a B-line without the inflation manipulation.? How often do these tubes need to be replaced, by experience (not rumor)?? Please, I would like to know the truth about what¡¯s going on with the 6HS6 vacuum tube.? Why are they priced so high?
?
Thank you.
?
73, Michael Smith, N4KZO
|
OK sorry for the mistake I used the term in reference to the meter not reading correctly.
73 Tim WB8UHZ
On Tuesday, January 7, 2025 at 10:55:56 PM EST, Jim Shorney via groups.io <jimnu0c@...> wrote:
OK but please stop calling them shunts. They are series voltage dropping resistors. The only shunt is the pot. A shunt is a resistance across the meter terminals to increase the current value needed for a full scale reading.
On Wed, 8 Jan 2025 03:38:34 +0000 (UTC) "amfone via groups.io" <amfone20000@...> wrote: >? Jim thanks for your help regarding the location and the voltage requirements of the shunts. -- 73 -Jim NU0C
|
6HS6 Price and Availability
Okay, so I know there has been a lot of discussion about the cost of these tubes. ?They are a relatively high transconductance IF amplifier tube ¡ª so what? ?I priced these tubes today from roughly $38 to $60, EACH. ?Come on folks, are these tubes really that rare and unique, or has somebody found a way to inflate the price to make a big quick-profit. ?I¡¯ve heard these stories of, ¡°Oh, tubes are getting scarce.¡± ? (The sky is falling, the sky is falling!) ?Then when one checks, well, the sky isn¡¯t actually falling, and there are LOTS of good NOS tubes available. ?I would like to run a B-line without the inflation manipulation. ?How often do these tubes need to be replaced, by experience (not rumor)? ?Please, I would like to know the truth about what¡¯s going on with the 6HS6 vacuum tube. ?Why are they priced so high?
?
Thank you.
?
73, Michael Smith, N4KZO
|
Re: Anyone have an R4B dial?
Steve,
?
Are the dials you have seen made by Radio Daze, perhaps?
?
73,
Michael Smith, N4KZO
|
OK but please stop calling them shunts. They are series voltage dropping resistors. The only shunt is the pot. A shunt is a resistance across the meter terminals to increase the current value needed for a full scale reading. On Wed, 8 Jan 2025 03:38:34 +0000 (UTC) "amfone via groups.io" <amfone20000@...> wrote: Jim thanks for your help regarding the location and the voltage requirements of the shunts. -- 73 -Jim NU0C
|
Jim thanks for your help regarding the location and the voltage requirements of the shunts.
These are the the resistors I purchased from Mouser, with the data sheet available to open from Mouser below it as I read it when I purchased these they are high voltage they are 2.2 meg at 1/2 watt 1% tolerance. Any advice I will appreciate thanks Tim
On Tuesday, January 7, 2025 at 10:02:39 PM EST, Jim Shorney via groups.io <jimnu0c@...> wrote:
Yes, that is where they are. It is a simple circuit. The only shunt in the circuit is the 10K pot R17. It adjusts the amount of current to the meter to provide a calibrated reading on the meter. The 2.2M series dropping resistors can be individually measured with a good DMM. Any one of them going open can render the circuit inoperable. I hope the resistors you bought are rated for high voltage. Each resistor in the circuit will develop over 280V across it when the HV is set to SSB.
On Wed, 8 Jan 2025 02:32:54 +0000
"Thomas W9TAB via groups.io" <electron@...> wrote:
> As I read the schematic R8 through R15 are the shunts 2.2 Meg and 1/2 watt. I have those from Mouser as of today. I have not opened the L7 but I believe they are located right behind the 3-500Z tubes in a clear sleeve
--
73
-Jim
NU0C
|
Yes, that is where they are. It is a simple circuit. The only shunt in the circuit is the 10K pot R17. It adjusts the amount of current to the meter to provide a calibrated reading on the meter. The 2.2M series dropping resistors can be individually measured with a good DMM. Any one of them going open can render the circuit inoperable. I hope the resistors you bought are rated for high voltage. Each resistor in the circuit will develop over 280V across it when the HV is set to SSB. On Wed, 8 Jan 2025 02:32:54 +0000 "Thomas W9TAB via groups.io" <electron@...> wrote: As I read the schematic R8 through R15 are the shunts 2.2 Meg and 1/2 watt. I have those from Mouser as of today. I have not opened the L7 but I believe they are located right behind the 3-500Z tubes in a clear sleeve -- 73 -Jim NU0C
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On Tuesday, January 7, 2025 at 09:32:59 PM EST, Thomas W9TAB via groups.io <electron@...> wrote:
Your L7 S/N is close to mine, I would perform the grid current meter calibration step to verify the meter functionality which is supplied by a voltage divider network (1 ohm 12w resistor) into a 200ua meter movement.?
I used an adjustable current / voltage bench top power supply and my Fluke 87 DMM set to madc, I checked it with the Fluke and power supply first then I put the grid circuit in series, there is an adjustment on the metering board.?
My plate current meter has an external shunt on the back of the meter and can be checked in a similar way as the grid current setup + to test point ¡°A¡± (Orange wire near edge of board) and the return would be pin 6 on the rear connector for the
plate circuit.?
On Jan 7, 2025, at 4:57?PM, amfone via groups.io <amfone20000@...> wrote:
?
Thanks Thomas its not the switches for the meter and other aspects of the meter forward watts reflected watts etc, it all works, lights are on etc. Pushing the Ep volts meter several times changes nothing what is happening
is I read 1600V no load in the CW position and 2300 in the SSB position, the supply is not the issue. I'm thinking its the meter shunts one of them anyway. As I read the schematic R8 through R15 are the shunts 2.2 Meg and 1/2 watt. I have those from Mouser
as of today. I have not opened the L7 but I believe they are located right behind the 3-500Z tubes in a clear sleeve probably made of woven glass pure fiber which acts like a heat resistant cover or its just heat shrink tubing.
Any info appreciated especially for anyone who has actually changed the shunts in an L7. The S/N on this L7 is 2960.
Thanks Tim
WB8UHZ
On Tuesday, January 7, 2025 at 03:20:43 PM EST, Clayton kk4iz via groups.io <kk4iz284@...> wrote:
I did check for shorts and loose wires. I clean the push buttons with a good contact clean ?but still no meter movement the lights do come on when pushed
On Jan 7, 2025, at 1:47?PM, Thomas W9TAB via groups.io <electron@...> wrote:
A good diagnostic check of the L7¡¯s Schadow push button switches is ¡°Does the accompanying light come on with each switch selection?¡±?
If not they might need cleaning.?
There are two sections for each switch, one for the indicator and the other for the function.?
On Jan 7, 2025, at 11:47?AM, amfone via groups.io <amfone20000@...> wrote:
?
Thank you to all for all of the good advice, much much appreciated!
Tim
WB8UHZ
On Monday, January 6, 2025 at 08:41:00 PM EST, Jim Shorney via groups.io <jimnu0c@...> wrote:
Your front panel pushbuttons may need a good cleaning.
On Mon, 6 Jan 2025 08:11:41 -0600
"Clayton kk4iz via groups.io" <KK4IZ284@...> wrote:
> I have a L-7 and neither meter is working. I have not checked to see if? the watt meeter works.
--?
73
-Jim
NU0C
73¡¯²õ
KK4IZ
Amateur Radio Operator
Warren Bryant?
124 Crestview Dr
Clanton,AL.??35045
Email:?KK4IZ284@...
Cell: 205-389-4170
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Greg W9GB
Thomas W9TAB
David
Jim Shorney