I looked this morning and my TR-4 has the arrowed dial skirt.
Thanks,
Barry - N4BUQ
From: "Steve Wedge, W1ES/4 via groups.io" <w1es@...>
To: "DRAKE-RADIO" <[email protected]>
Sent: Thursday, May 11, 2023 5:56:36 PM
Subject: Re: [DRAKE-RADIO] Drake Dial?
The arrow is with TR-3, at least. I also believe it was in early TR-4. The reason is that the 20m band goes ¡°backwards¡± from the other bands, so you can¡¯t use numbering around the skirt.?
The ¡°B¡± period TR-4 had a similar skirt to the B Line but also no numbering. The gave you a 0 index mark and just lines, otherwise.?
Interestingly, the skirt of the TR-6 has numbers but they run the reverse of the B Twins.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Thu, May 11, 2023 at 15:05, VE7PS <ve7ps@...> wrote: I have a couple like that here too, if anyone needs one. Not sure about it being for a TR-3 or early TR-4. They had a plate like that under the fluted knob, yes, but not sure it ever had an arrow on it. I have others for the R-4 that are also similar...but no arrow.j Peter VE7PS
On Thu, May 11, 2023 at 10:50?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: That¡¯s TR-3/early TR-4 that uses the fluted knob. Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS On Thu, May 11, 2023 at 13:09, n4buq < n4buq@...> wrote: Not sure if any of you guys have seen this. According to the poster, it's 2.25" in diameter so smaller than a 2-B dial at 2.5" but maybe someone recognizes it here and could use it.
Thanks,
Barry - N4BUQ
|
Strangely enough, I had never heard anything about these components, when, yesterday I saw a reference to them on the Facebook VETE page and then something popping up here in the Drake reflector.
Are these parts in the PS7?? The time period suggests that they could be.? I have not opened up my PS7 since I bought it and I have already a large number of projects to complete.? I guess that, since the TR7 does have a 120V buss in it for the fan that the TR7/TR7A could also have these capacitors inside them.? As luck would have it, the TR7A is up for a troubleshooting session as soon as I finish with my 2-B's, as ,y friend is waiting to get his TR7 back that I'll be board-swapping to tind that AGC gremlin that I've described before.
Whilst my mind darts around, does anyone know if the L7 has any of these RIFA caps in it?
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
|
(Changing the subject line)
I took another look and those caps are not grounded but connected across LINE and NEUTRAL through low-value resistors. I presume one of those is the resistor to which you're referring. The caps leak for a while before blowing and that causes those resistors to overheat. I had that occur in one of my scopes.
I'm not looking at the schematic of your scope so not sure what's causing 60V on your chassis. It can be caused by leaky power-line filters but, again, not sure what's in your scope.
Thanks,
Barry - N4BUQ
toggle quoted message
Show quoted text
----- Original Message ----- From: "jerry-KF6VB" <jerry@...>
To: "DRAKE-RADIO" <[email protected]>
Sent: Thursday, May 11, 2023 10:04:48 PM
Subject: Re: [DRAKE-RADIO] 2-B 50kHz Alignment Question On 2023-05-11 18:01, n4buq wrote:
Hi Jerry,
In case you're not aware of it, the 2400-series power supplies have
line-filtering RIFA caps between line and ground as well as neutral to
ground. *** Now aware. One exploded cap on the board. Luckily,
I have the big service manual that was in the bag on top of the scope.
Do these caps need to be anything special other than
rated for 250V?
There's also a popped resistor next to the popped cap. Broken
in half - probably from the physical force of the cap exploding.
This resistor is in series with the little transformer that produces the
"line sync" voltage.
But the popped cap doesn't explain the 60VAC on the chassis.
Especially since it persists with the power switch off. The power
switch disconnects BOTH legs of the AC input. Or it's supposed to :).
With the power switch off, the only things left in the circuit
are the EMI module and the fuse holder.
My ohmmeter says that the EMI module is OK; but the ohmmeter doesn't
output 125VAC. Actually, I have an old Heathkit capacitor checker that
can output a lot of volts; maybe I'll drag that in from the shed.
When I turn on the scope, it gives a failed self test - something about
inadequate positive voltage. But then you cancel the self test, and it
works normally.
- Jerry, KF6VB
|
Re: wtb: repairable ac-3 or ac-4
As I answered the previous?call for a TR3 assembly power supply: | Thu, May 11, 7:52?PM (11 hours ago)
| | | |
I have an AC3 that I used with a TR3 many years ago.? I still?have both and they are on the?list for restoration.? From the looks of it, I already?changed one of the?capacitors?and it worked then, but I would suggest that a new kit be installed.? I also have an MS4 speaker and cabinet for it if you wish.? In the arrangement I had, I used a RV3 remote VFO and speaker power supply with it.? Was a lot of fun, then.
I am going to the Dayton hamfest and can bring?it all with me, if you plan to be there; otherwise the shipping would be quite costly.
So, what do you think?? If you can get one that is plug in working, you may wish to go with that instead of this.?
I am sure that you know the AC4 will also work with the TR3, but same issue; it likely needs an upgrade as well. David Assaf III W5XU, VP8RXU ?
I could also use a AC-3 or AC-4 for my TR-3.
This is on my list to look for at Dayton.
Dave KC3AM
On 5/11/2023 6:52 PM, Jim Linsenbardt
wrote:
Hi to all!
I recently got a TR-3 functional and hope to use it on some of the
vintage nets. I'm now looking for a repairable power supply to
pair with it (with or without speaker.) If you happen to have one,
please let me know.
73's and best wishes
Jim
KD0WF
|
Re: 2-B 50kHz Alignment Question
On 2023-05-11 18:01, n4buq wrote: Hi Jerry,
In case you're not aware of it, the 2400-series power supplies have
line-filtering RIFA caps between line and ground as well as neutral to
ground. *** Now aware. One exploded cap on the board. Luckily, I have the big service manual that was in the bag on top of the scope. Do these caps need to be anything special other than rated for 250V? There's also a popped resistor next to the popped cap. Broken in half - probably from the physical force of the cap exploding. This resistor is in series with the little transformer that produces the "line sync" voltage. But the popped cap doesn't explain the 60VAC on the chassis. Especially since it persists with the power switch off. The power switch disconnects BOTH legs of the AC input. Or it's supposed to :). With the power switch off, the only things left in the circuit are the EMI module and the fuse holder. My ohmmeter says that the EMI module is OK; but the ohmmeter doesn't output 125VAC. Actually, I have an old Heathkit capacitor checker that can output a lot of volts; maybe I'll drag that in from the shed. When I turn on the scope, it gives a failed self test - something about inadequate positive voltage. But then you cancel the self test, and it works normally. - Jerry, KF6VB
|
Re: wtb: repairable ac-3 or ac-4
I could also use a AC-3 or AC-4 for my TR-3.
This is on my list to look for at Dayton.
Dave KC3AM
On 5/11/2023 6:52 PM, Jim Linsenbardt
wrote:
toggle quoted message
Show quoted text
Hi to all!
I recently got a TR-3 functional and hope to use it on some of the
vintage nets. I'm now looking for a repairable power supply to
pair with it (with or without speaker.) If you happen to have one,
please let me know.
73's and best wishes
Jim
KD0WF
|
Re: Drake 1-A output transformer?
This document is also conveniently located in the group file section and includes an additional circuit revision image in a single ZIP file. /g/DRAKE-RADIO/files/1A%20Early.zip73 -Jim NU0C On Thu, 11 May 2023 17:04:30 +0000 "Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote: Thanks, Peter. I¡¯m not sure that I had all of this early one.
I¡¯ll be getting back to the 1-A after I finish the 2-AB¡¯s, then a TR7 mystery and a driver issue with the TR-4Cw RIT.
I¡¯m busier now than I ever was.
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Thu, May 11, 2023 at 12:42, VE7PS <[ve7ps@...](mailto:On Thu, May 11, 2023 at 12:42, VE7PS <<a href=)> wrote:
Steve/Chris;
See attached schematics. May help if you don't already have these.
The transition was at serial #453.
I think mine is #456 or something like that - just after the change was made.
73
Peter
VE7PS
On Thu, May 11, 2023 at 5:58?AM Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
Chris, the output transformer is a generic part that was very common in the days when this receiver was made. The 6AQ5 was very commonly used as an audio output amp and Drake used a fairly standard circuit. I replaced the transformer in mine and bought the part for something like $10 on eBay.
I have been struggling, off and on, with a 1-A for the past couple of years. I have an intermittent problem that I believe is inside the low pass filter in the audio chain but I haven't mustered up the guts to take it out and go inside. Good luck with yours and I hope that it's from '58 because the only existing schematics seem to be for serial numbers after around 386. Mine is 331 (I think) and there are definite differences.
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent with [Proton Mail]() secure email.
------- Original Message -------
On Thursday, May 11th, 2023 at 7:51 AM, Chris Farley via groups.io <vacuuminded2@...> wrote:
Hi all,
I just picked up a bucket list 1A which seems to fundamentally work, however the output transformer appears to be a much later replacement AND has failed. Tall order but has anybody an un-saveable parts unit for this transformer or the whole speaker/transformer assembly?
Regards,
Chris kc9ieq
|
Re: 2-B 50kHz Alignment Question
Hi Jerry,
In case you're not aware of it, the 2400-series power supplies have line-filtering RIFA caps between line and ground as well as neutral to ground. Those are notorious for burning out - sometimes causing a brief spike that would trip a GFCI. Once they burn out, though, they don't typically cause any more problems but it's good to replace them with modern/better components (I did). They're pretty easy to spot on the LVPS board.
Good luck with it,
Barry - N4BUQ
toggle quoted message
Show quoted text
----- Original Message ----- From: "jerry-KF6VB" <jerry@...>
To: "DRAKE-RADIO" <[email protected]>
Sent: Thursday, May 11, 2023 5:24:17 PM
Subject: Re: [DRAKE-RADIO] 2-B 50kHz Alignment Question On 2023-05-11 10:14, Steve Wedge, W1ES/4 via groups.io wrote:
Yep ¡ª a cheap Chinese generator that I bought on Amazon. It is more
than stable and accurate enough to align these radios. *** I almost bought that one. Actually, an upgraded 80Mhz version with
higher sample rate. And actually...I DID buy it. But I sent it back;
didn't even open the box. Why?
I really needed a frequency counter, and it had one built in; but
perusing the user manual online, I discovered that the built-in
frequency
counter was not very sensitive. It required 2 volts p-p to count. Not
nearly sensitive enough to align my TR7. Ebay yielded up an HP counter
with 15mV sensitivity.
I realized that the only reason I was going after that generator was
that it's small. Not having a proper test bench with an equipment
tower,
I lusted after tiny instruments that could fit on the table along with
whatever I was fixing.
The solution? Went to the Home Depot yesterday and bought a sheet of
1/2 inch plywood. Cut out a upper shelf for my worktable. Ripped a 2x4
into a pair of 2x2's for stiffeners. Now I have a five-foot shelf, 16
inches wide ( the depth of my good scope ). It's about 20 inches above
the table, giving me plenty of space to work. I plan to install
lighting
under the shelf.
Already populated it. Got out the good signal generator ( Wavetek
3000 )
and the good scope, a dual lab supply, a decent HP frequency counter.
Left
the bench for a while to do other stuff. Came back to a smell of burned
electronics
and a popped GFCI. Huh?
Apparently the good scope ( Tektronix 2445 ) had sat in the shed too
long. A voltmeter
between the scope and ground shows 60VAC. This continues with the power
off and the fuse
removed. Only thing left in circuit is the input EMI filter. Probably
one of the caps shorted out.
Luckily, I have the service manual. Tektronix P/N 119-1536-00. None to
be had anywhere.
HOWEVER, one website had a picture of it. It's made by TDK, their P/N
ZUB2203-00. Woohoo!
Those can be got! On order... There might be more. It's failing a
self test that says "Positive Voltage
too low". I'll worry about that after I install the new EMI filter.
In the meantime, I can use my Rigol DSO to align the TR7.
- Jerry, KF6VB
|
Re: Drake 1-A output transformer?
Thanks, good info to have in the archives!
Regards, Chris kc9ieq
On Thu, May 11, 2023 at 11:42 AM, VE7PS <ve7ps@...> wrote: Steve/Chris;
See attached schematics.? May help if you don't already have these.
The transition was at serial #453.
I think mine is #456 or something like that - just after the change was made.
73 Peter VE7PS On Thu, May 11, 2023 at 5:58?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: Chris, the output transformer is a generic part that was very common in the days when this receiver was made.? The 6AQ5 was very commonly used as an audio output amp and Drake used a fairly standard circuit.? I replaced the transformer in mine and bought the part for something like $10 on eBay.
I have been struggling, off and on, with a 1-A for the past couple of years.? I have an intermittent problem that I believe is inside the low pass filter in the audio chain but I haven't mustered up the guts to take it out and go inside.? Good luck with yours and I hope that it's from '58 because the only existing schematics seem to be for serial numbers after around 386.? Mine is 331 (I think) and there are definite differences.
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
------- Original Message -------
On Thursday, May 11th, 2023 at 7:51 AM, Chris Farley via <vacuuminded2= [email protected]> wrote:
Hi all,?
I just picked up a bucket list 1A which seems to fundamentally work, however the output transformer appears to be a much later replacement AND has failed.? Tall order but has anybody an un-saveable parts unit for this transformer or the whole speaker/transformer assembly???
Regards,?
|
Re: wtb: repairable ac-3 or ac-4
I have an AC3 that I used with a TR3 many years ago.? I still?have both and they are on the?list for restoration.? From the looks of it, I already?changed one of the?capacitors?and it worked then, but I would suggest that a new kit be installed.? I also have an MS4 speaker and cabinet for it if you wish.? In the arrangement I had, I used a RV3 remote VFO and speaker power supply with it.? Was a lot of fun, then.
I am going to the Dayton hamfest and can bring?it all with me, if you plan to be there; otherwise the shipping would be quite costly.
So, what do you think?? If you can get one that is plug in working, you may wish to go with that instead of this.?
I am sure that you know the AC4 will also work with the TR3, but same issue; it likely needs an upgrade as well.
David Assaf III W5XU, VP8RXU ?
Hi to all!
I recently got a TR-3 functional and hope to use it on some of the vintage nets. I'm now looking for a repairable power supply to pair with it (with or without speaker.) If you happen to have one, please let me know.
73's and best wishes
Jim
KD0WF
|
martins.m0pam@... ? Hi Martin..
The above is the email address for your email from the group.
? I looked at your account and everything is in order.? I have no idea why you are not receiving the groups posts. ? Check your SPAM folder.? Check and see if your email service provider has done something to restrict your access. ? Joe ¨C W7RKN Co-Owner/Co-Moderator ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of armando martins via groups.io
Sent: Thursday, May 11, 2023 3:28 PM
To: [email protected]
Subject: [DRAKE-RADIO] new listing? to the site moderator hi there i stop getting an mail from the group and i am a bit confused about that. could you please let me know if i still a member of the group or what hapens to my membership many thanks m0pam ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
|
The arrow is with TR-3, at least. I also believe it was in early TR-4. The reason is that the 20m band goes ¡°backwards¡± from the other bands, so you can¡¯t use numbering around the skirt.?
The ¡°B¡± period TR-4 had a similar skirt to the B Line but also no numbering. The gave you a 0 index mark and just lines, otherwise.?
Interestingly, the skirt of the TR-6 has numbers but they run the reverse of the B Twins.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Thu, May 11, 2023 at 15:05, VE7PS < ve7ps@...> wrote: I have a couple like that here too, if anyone needs one. Not sure about it being for a TR-3 or early TR-4. They had a plate like that under the fluted knob, yes, but not sure it ever had an arrow on it. I have others for the R-4 that are also similar...but no arrow.j
Peter VE7PS
On Thu, May 11, 2023 at 10:50?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: That¡¯s TR-3/early TR-4 that uses the fluted knob.
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Thu, May 11, 2023 at 13:09, n4buq < n4buq@...> wrote: Not sure if any of you guys have seen this. According to the poster, it's 2.25" in diameter so smaller than a 2-B dial at 2.5" but maybe someone recognizes it here and could use it.
Thanks,
Barry - N4BUQ
|
I guess title says it all, looking for a c line at Dayton next week, whatcha got??
K8cca?
|
wtb: repairable ac-3 or ac-4
Hi to all!
I recently got a TR-3 functional and hope to use it on some of the vintage nets. I'm now looking for a repairable power supply to pair with it (with or without speaker.) If you happen to have one, please let me know.
73's and best wishes
Jim
KD0WF
|
to the site moderator hi there i stop getting an mail from the group and i am a bit confused about that. could you please let me know if i still a member of the group or what hapens to my membership many thanks m0pam
|
Re: 2-B 50kHz Alignment Question
On 2023-05-11 10:14, Steve Wedge, W1ES/4 via groups.io wrote: Yep ¡ª a cheap Chinese generator that I bought on Amazon. It is more
than stable and accurate enough to align these radios. *** I almost bought that one. Actually, an upgraded 80Mhz version with higher sample rate. And actually...I DID buy it. But I sent it back; didn't even open the box. Why? I really needed a frequency counter, and it had one built in; but perusing the user manual online, I discovered that the built-in frequency counter was not very sensitive. It required 2 volts p-p to count. Not nearly sensitive enough to align my TR7. Ebay yielded up an HP counter with 15mV sensitivity. I realized that the only reason I was going after that generator was that it's small. Not having a proper test bench with an equipment tower, I lusted after tiny instruments that could fit on the table along with whatever I was fixing. The solution? Went to the Home Depot yesterday and bought a sheet of 1/2 inch plywood. Cut out a upper shelf for my worktable. Ripped a 2x4 into a pair of 2x2's for stiffeners. Now I have a five-foot shelf, 16 inches wide ( the depth of my good scope ). It's about 20 inches above the table, giving me plenty of space to work. I plan to install lighting under the shelf. Already populated it. Got out the good signal generator ( Wavetek 3000 ) and the good scope, a dual lab supply, a decent HP frequency counter. Left the bench for a while to do other stuff. Came back to a smell of burned electronics and a popped GFCI. Huh? Apparently the good scope ( Tektronix 2445 ) had sat in the shed too long. A voltmeter between the scope and ground shows 60VAC. This continues with the power off and the fuse removed. Only thing left in circuit is the input EMI filter. Probably one of the caps shorted out. Luckily, I have the service manual. Tektronix P/N 119-1536-00. None to be had anywhere. HOWEVER, one website had a picture of it. It's made by TDK, their P/N ZUB2203-00. Woohoo! Those can be got! On order... There might be more. It's failing a self test that says "Positive Voltage too low". I'll worry about that after I install the new EMI filter. In the meantime, I can use my Rigol DSO to align the TR7. - Jerry, KF6VB
|
looks like the skirt for the drake tr3 vfo knob.
On Thu, May 11, 2023 at 1:09?PM n4buq < n4buq@...> wrote: Not sure if any of you guys have seen this.? According to the poster, it's 2.25" in diameter so smaller than a 2-B dial at 2.5" but maybe someone recognizes it here and could use it.
Thanks,
Barry - N4BUQ
|
OK - just checked?my TR-4, and it does?have an arrow!? This one is not the flat dial, but the beveled one like the B-line.? Gary's right though - no numbers on it.
It's conceivable then to me that the earlier flat dial did have the arrow as well on the transceivers.
Learn something new every day!? Trouble is I now forget way more things each day!
PS
The rx/tx have numbers, the transceivers »å¾±»å²Ô¡¯³Ù. 73, Gary WB6OGD? On May 11, 2023, at 12:05 PM, VE7PS <ve7ps@...> wrote:
? I have a couple like that here too, if anyone needs one.? Not sure about it being for a TR-3 or early TR-4.? They had a plate like that under the fluted knob, yes,? but not sure it ever had an? arrow on it.? I have others for the R-4 that are also similar...but no arrow.j
Peter VE7PS On Thu, May 11, 2023 at 10:50?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: That¡¯s TR-3/early TR-4 that uses the fluted knob.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Thu, May 11, 2023 at 13:09, n4buq < n4buq@...> wrote: Not sure if any of you guys have seen this. According to the poster, it's 2.25" in diameter so smaller than a 2-B dial at 2.5" but maybe someone recognizes it here and could use it.
Thanks,
Barry - N4BUQ
|
The rx/tx have numbers, the transceivers »å¾±»å²Ô¡¯³Ù. 73, Gary WB6OGD?
toggle quoted message
Show quoted text
On May 11, 2023, at 12:05 PM, VE7PS <ve7ps@...> wrote:
? I have a couple like that here too, if anyone needs one.? Not sure about it being for a TR-3 or early TR-4.? They had a plate like that under the fluted knob, yes,? but not sure it ever had an? arrow on it.? I have others for the R-4 that are also similar...but no arrow.j
Peter VE7PS On Thu, May 11, 2023 at 10:50?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: That¡¯s TR-3/early TR-4 that uses the fluted knob.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS
On Thu, May 11, 2023 at 13:09, n4buq < n4buq@...> wrote: Not sure if any of you guys have seen this. According to the poster, it's 2.25" in diameter so smaller than a 2-B dial at 2.5" but maybe someone recognizes it here and could use it.
Thanks,
Barry - N4BUQ
|
I almost like the idea of there being one mark per revolution on the dial.? It sort of helps to count the digits.
Thanks,
Barry - N4BUQ
From: "VE7PS" <ve7ps@...>
To: "DRAKE-RADIO" <[email protected]>
Sent: Thursday, May 11, 2023 2:05:28 PM
Subject: Re: [DRAKE-RADIO] Drake Dial?
I have a couple like that here too, if anyone needs one.? Not sure about it being for a TR-3 or early TR-4.? They had a plate like that under the fluted knob, yes,? but not sure it ever had an? arrow on it.? I have others for the R-4 that are also similar...but no arrow.j Peter VE7PS
On Thu, May 11, 2023 at 10:50?AM Steve Wedge, W1ES/4 via <w1es= [email protected]> wrote: That¡¯s TR-3/early TR-4 that uses the fluted knob.? Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
Sent from Proton Mail for iOS On Thu, May 11, 2023 at 13:09, n4buq < n4buq@...> wrote: Not sure if any of you guys have seen this. According to the poster, it's 2.25" in diameter so smaller than a 2-B dial at 2.5" but maybe someone recognizes it here and could use it.
Thanks,
Barry - N4BUQ
|
David
Jim Shorney
K8CCA
armando martins
joe braswell
Gary WB6OGD