Re: SX-62B alignment instructions
Hi Scott.? That’s good info. So the problem seems to be in the FM limiter /discriminator area ??I will do some head scratching, but others might have the answer first. We had a day or two of nice weather, and I was out cleaning up flower beds so now I cant move. ? -- don??? va3drl
|
Re: SX-62B alignment instructions
Hi Don,
After I do the AM alignment part of the 2 high bands 88-108 and 27-55, I switch to FM, and there is no sound, because the RF gain control is all the way up,
as I lower the RF gain it begins to howl out of the speaker, then it finally drops into the normal audio hush. My o-scope is in storage, but I am using a frequency counter, and an RCA WR-50b signal generator. The generator output attenuator seems fine, and
cuts off the output on it's lowest setting.
The RF control works the same way with or without the generator running, and sounds terrible on a FM station, overdriven sounding, even with the RF control at its "best sounding position" between 2-3.using the settings as in the alignment setup. On AM the high
bands work, but not well on FM stations. The RF gain control can be advanced to 10 on the 2 top bands in the AM position, and pick up AM signals ok.
When I received the receiver all bands worked, but poorly, I don't remember if FM was proper before the recap, but it barely worked.
The general condition of the receiver is great, with all of the original tubes, which test as new. CW does work, but is turned off. The callibrator works, but is also turned off.
Thanks,
Scott
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Scott, I’m not too smart and also can’t read between the lines and words.?
What is oscillating?, and at what frequency? I guess you see it on a scope unless it is from the BFO and out the speaker.??
?
You mentioned nothing about the history and if you have ever had it receiving or not on any band. ?
Will it work on AM/CW on all bands ? ?and it is just the FM detector?
On FM what happens with the signal generator off and an antenna ..nothing?, stations? Oscillations most of the time?
Is your RG gain pot in good shape, or is it noisy, erratic? ???
I have a sx-62 of some version in sick bay so I am extra curious but it will take a while to understand things.
?
?
I did both alignments, and all seemed well until I switched in FM, and the gain was too high, and it wouldn't receive until I turned the RF control to 2-3, and only "works" in a small range,
either too high, and oscillates and blanks, or too low a gain to hear anything.
?
._,_
--
don??? va3drl
|
Re: SR-160 Vernier Dial Lubricaion
Hi Walt,
?
Excellent advice! ?Thank you very much for your help!
?
--
|
Re: SX-62 alignment instructions
Scott, I’m not too smart and also can’t read between the lines and words.? What is oscillating?, and at what frequency? I guess you see it on a scope unless it is from the BFO and out the speaker.?? ? You mentioned nothing about the history and if you have ever had it receiving or not on any band. ? Will it work on AM/CW on all bands ? ?and it is just the FM detector? On FM what happens with the signal generator off and an antenna ..nothing?, stations? Oscillations most of the time? Is your RG gain pot in good shape, or is it noisy, erratic? ??? I have a sx-62 of some version in sick bay so I am extra curious but it will take a while to understand things. ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Scott Petersen via groups.io
Sent: Sunday, March 16, 2025 9:26 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SX-62 alignment instructions? I did both alignments, and all seemed well until I switched in FM, and the gain was too high, and it wouldn't receive until I turned the RF control to 2-3, and only "works" in a small range, either too high, and oscillates and blanks, or too low a gain to hear anything. -- don??? va3drl
|
Re: SX-62 alignment instructions
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Don
Your IF alignment instructions are missing an important caveat.? You must lower the SG output to below where the AVC begins to operate.? Not doing so will cause the IFTs to be misaligned.? With the volume and RF gain controls at maximum, the
SG modulation should be heard but just barely over the background noise as the IF alignment progresses.??
Better to measure the voltage at the speaker terminals and not rely too much on one's hearing, especially as we get older, right Richard?.? This IF alignment method would be useable for all superhetrodyne receivers, not just hallicrafters.
Might as well mention that if the radio has a crystal filter in the IF chain, the frequency that this crystal passes through the filter is used to align the IFTs, not the SG dial reading.
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
Scott, as an aside, this is what they say for the S-20R .. they use the converter but disconnect it from upstream.
?
Thanks!, I didn't look up which pin did what, I thought it could have been the plate, and pulling the tube would isolate the RF coming in. SX-62B
Scott, It is a SX-62 {no suffix} ?
Since the signal is injected on the grid, it would seem the tube would have to be in service. ??
?
--
don??? va3drl
|
Re: SX-62 alignment instructions
I did both alignments, and all seemed well until I switched in FM, and the gain was too high, and it wouldn't receive until I turned the RF control to 2-3, and only "works" in a small range, either too high, and oscillates and blanks, or too low a gain to hear
anything.
toggle quoted message
Show quoted text
Don
Your IF alignment instructions are missing an important caveat.? You must lower the SG output to below where the AVC begins to operate.? Not doing so will cause the IFTs to be misaligned.? With the volume and RF gain controls at maximum, the SG modulation should
be heard but just barely over the background noise as the IF alignment progresses.??
Better to measure the voltage at the speaker terminals and not rely too much on one's hearing, especially as we get older, right Richard?.? This IF alignment method would be useable for all superhetrodyne receivers, not just hallicrafters.
Might as well mention that if the radio has a crystal filter in the IF chain, the frequency that this crystal passes through the filter is used to align the IFTs, not the SG dial reading.
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Sunday, March 16, 2025 at 01:53:14 PM CDT, don Root <drootofallevil@...> wrote:
Scott, as an aside, this is what they say for the S-20R .. they use the converter but disconnect it from upstream.
?
Thanks!, I didn't look up which pin did what, I thought it could have been the plate, and pulling the tube would isolate the RF coming in. SX-62B
Scott, It is a SX-62 {no suffix} ?
Since the signal is injected on the grid, it would seem the tube would have to be in service. ??
?
--
don??? va3drl
|
Thank you, Jim. Well, I'm in Tacoma, if that's considered close to the Canadian border (+/- 3 hr drive on a good day). Shipping it to Arkansas? Return shipping would be a few times the worth of the thing, and who knows what UPS or one of their cousins would do to it, even if double boxed (as I know from experience).
?
In the meantime, my SX-28 stopped working last fall and I've been avoiding it ever since. I need to take a deep breath and dive into it, but not just yet.
?
Tom
On 03/16/2025 2:08 PM PDT Jim Whartenby via groups.io <old_radio@...> wrote:
?
?
Tom
That is a shame.? I was just wondering if you had made any progress.? Perhaps a list member up in the north-west area of the country would be interested in having a go at it?? How far are you from the Canadian border?
?
I'm in Arkansas over 2000 miles away from you so that would be a lot of shipping expense for me to take a look at it.? That said, the furthest I have done a repair was for a gentleman in Fukushima, Japan.
Regards,
Jim
?
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
?
?
?
?
I certainly appreciate all the advice, hints and overall help I received in my attempt to resurrect this fine old survivor but, for me at least, I think the journey is over. Properly servicing the mixer section means that the LO coil assembly will have to be sufficiently lifted or even removed from the chassis. I found that doing so is beyond my ability. This assembly is connected to the main tuning capacitor by a connection that I am unable to de-solder in such a tight spot. It would take a heftier soldering iron than either one of the two I have, and even if I could, I doubt my ability to reconnect it. I'm a hobbyist, not a technician with the experience to deal with such a challenge.
?
It's a pity--I think this receiver would be very serviceable if repaired, and be capable of performing as well as most vintage, single conversion receivers lacking a crystal filter. So, back on the shelf it goes. I'll hold on to it for a while--after all, not too many people are going to want to tackle a receiver with challenges like this one.
?
Thanks again,
?
Tom
On 03/09/2025 6:11 PM PDT don Root <drootofallevil@...> wrote:
?
?
Jim & Tom?
The Hexode signal grid has a max? or min? voltage of -3? presumably to the cathode [depends who you read] , but my conclusion from a Sylvania ??blurb? is that it can go as positive as -3 volts, and as negative as -30 where there is little transconductance, and so is often connected to the AVC, but apparently not in the S-20R. but that does not help the situation.
As Jim says, on band 1 ?there is no ground, and I say there is no control of THAT grid voltage by ground, AVC or other, so it floats. On the other bands the bottoms of ?3,2,1 can be grounded [all depending] providing a DC ground ?but it goes thru the coil{s} so is strange to me. But band 1 is a real mystery to me too. ?
?
Tom, I suggested a test for the bandswitch area? was it not practicle? ?
?
?
That is interesting.? The tube manual indicates that -3 volts should be there.? Have you replaced C5 and C8?? Minor leakage in either could cancel the expected negative bias on G3 of the 6K8.? From the QST article, I expect that there are unintended interactions when the expected voltages are out of spec.
In looking at the schematic for the umpteenth time, I see how the upper band tank coils are returned to ground through switch 7D rotor that shorts the bottom of the band coils to ground.? Not sure how L13 is grounded when the band switch is in the BCB setting.? If you measure the DC resistance from the grid cap to ground you should measure R12 (33 ohms +/- 20%) plus the coil resistance for each band switch setting.? Is this the case???
Measuring from the switch side of R12, you should measure just the tank coil resistance to ground.? That resistance should increase as the band switch connects to the next lower tank coil.? If you don't see the coil resistance then perhaps the oscillator stator sections of either C1 or C2 is grounded?
Likewise, the switch side of C37 should measure the LO coil resistance to ground for each band switch setting.? Like the above, each lower band coil resistance will be higher.? Is this the case?
Remote troubleshooting is a s-l-o-w process,
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Sunday, March 9, 2025 at 11:47:14 AM CDT, Allthumbs via groups.io <btse1@...> wrote:
Thank you, Jim. The 6K8 control grid (grid cap) measures 0.00 vdc, pretty much as expected.
--
don??? va3drl
?
|
Re: SR-160 Vernier Dial Lubricaion
Hi Matt,
First thing is to clean all the old lub off. This should be done with small artist brushes or the steel tube acid brushes dipped into cleaning solution. Don't use a spray cleaner. I use alcohol. Careful, not to get any on the dial face. The gears need very
little lub. I use a toothpick and place a very small dot of white lub on each gear. Then rotate from stop to stop a few times to distribute the grease. A little is great, a little more is bad. If the dial is dirty, carefully clean a small area with just water
and rag. If the dial will not clean up, overlays are available.
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
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Hi All,
?
I am restoring an SR-160 that has been dormant for some time.? The vernier dial does rotate through it's full rotation but does so sluggishly, getting stuck periodically.? Does anyone have any suggestions regarding lubrication of the vernier dial mechanism
(type of lubricant, places to lubricate, etc)?
?
--
|
Thank you, Don. Yes, taking a break from it is what I need. You're right, that cap probably is C7, not C37. And the cathode voltage is okay, so it's probably not a faulty C7. But lifting or removing the LO coil assembly is still necessary to clean things up? around the 6K8. One of these days I'll get back to it.
?
Tom
On 03/16/2025 1:54 PM PDT don Root <drootofallevil@...> wrote:
?
?
Tom,? well we all get worn down and discouraged when things beat us. Also, after concentrating on something, it is hard to see the forest ?for the trees.? So perhaps it is time for a break.? Most of us just dab in this, and learn bits and pieces from here and there. Maybe we [ me anyhow] speak over your head, since we as individuals don’t know “just what you know”. That is always a problem. It is best to speak up; this is not a competition, it is a mutual assistance group of non-professionals down to first time dabblers. ?While you have your nose in the Rosin smoke, I’m looking into info on the 6K8? and other converters, and so learning a little bit.
?
For some time in the future, as to your problem , that cap must be C7 a 2200??F [or these days maybe 2200pF] connected to the cathode? and not C37 connected to the bandswitch.? You had a good voltage on the cathode, so it [and C8] don’t seem to be shorted and my guess is they are ok but cant be sure.
?
I wonder if you understood the simple resistance tests on the coil area? that I sent before. ???
--
don??? va3drl
|
Re: SX-62 alignment instructions
Scott, you did not yet say, is it a SX-62 A, or B or no-suffix? It seems that you did the 455 IF ok ????but the 10.7 IF ?is the problem? ??or are you all the way down to the FM ?detector ??? I was just looking ?quickly at the 62-A instructions. ? I did not see any indication of the sig gen output power/voltage so I wonder about that! ?you are saying that there is so much gain in the 7F8 mixer section ?that it somehow ?swamps out the Local oscillator ? ?but only at 10.7,not 455? IS this where you are? IF ALIGNMENT (10.7 MC) - Set the controls as follows: BAND SELECTOR. . . . . .. 27/56 mc range RECEIVE/STANDBY switch .. RECEIVE CALIB. XTAL switch ...... OFF NOISE LIMITER switch ..... OFF VOLUME .............. Near Maximum RECEPTION control. . AM SELEC TIVITY control. NORMAL/SHARP SENSITIVITY control . Near Maximum Set tuning dial pointer at approx. midscale. ? Connect the high side of the signal generator through an 0.1 mfd. capacitor to pin #1 of the 7F8 converter tube. Set signal generator at 10.7 mc and adjust slugs S-4,6.9,13 and 15 for maximum output. Now set slugs S-2 and S-l1 for maximum output but do not readjust slugs S-4 6.9, 13 and 15. 翱谤………………. Set RECEPTION control at FM and adjust slug S-16 for maximum output. Now set Slug S-7 for the null or minimum output as indicated on the output meter. Check the discriminator by slowly tuning the signal generator through 10 .7 mc and observe the two maximum audio level readings on the output meter. If the two peaks are equal the job is done ; if not it may be necessary to reset Slug S-16 until a reasonable balance is obtained. I don’t see how the RF gain[sensitivity] affects the 6F8, but that is a big schematic to try to digest. Somebody must know ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Scott Petersen via groups.io
Sent: Sunday, March 16, 2025 4:40 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SX-62 alignment instructions? Thanks, I tried(the correct way), but I'm having issues with the FM, it has so much gain in FM that the oscillator stops, until I reduce the RF gain, I have to align it on 2-3? on the RF gain to get anything out of it. going to start over and try again. -- don??? va3drl
|
Tom That is a shame.? I was just wondering if you had made any progress.? Perhaps a list member up in the north-west area of the country would be interested in having a go at it?? How far are you from the Canadian border?
I'm in Arkansas over 2000 miles away from you so that would be a lot of shipping expense for me to take a look at it.? That said, the furthest I have done a repair was for a gentleman in Fukushima, Japan. Regards, Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
I certainly appreciate all the advice, hints and overall help I received in my attempt to resurrect this fine old survivor but, for me at least, I think the journey is over. Properly servicing the mixer section means that the LO coil assembly will have to be sufficiently lifted or even removed from the chassis. I found that doing so is beyond my ability. This assembly is connected to the main tuning capacitor by a connection that I am unable to de-solder in such a tight spot. It would take a heftier soldering iron than either one of the two I have, and even if I could, I doubt my ability to reconnect it. I'm a hobbyist, not a technician with the experience to deal with such a challenge.
?
It's a pity--I think this receiver would be very serviceable if repaired, and be capable of performing as well as most vintage, single conversion receivers lacking a crystal filter. So, back on the shelf it goes. I'll hold on to it for a while--after all, not too many people are going to want to tackle a receiver with challenges like this one.
?
Thanks again,
?
Tom
On 03/09/2025 6:11 PM PDT don Root <drootofallevil@...> wrote:
?
?
Jim & Tom?
The Hexode signal grid has a max? or min? voltage of -3? presumably to the cathode [depends who you read] , but my conclusion from a Sylvania ??blurb? is that it can go as positive as -3 volts, and as negative as -30 where there is little transconductance, and so is often connected to the AVC, but apparently not in the S-20R. but that does not help the situation.
As Jim says, on band 1 ?there is no ground, and I say there is no control of THAT grid voltage by ground, AVC or other, so it floats. On the other bands the bottoms of ?3,2,1 can be grounded [all depending] providing a DC ground ?but it goes thru the coil{s} so is strange to me. But band 1 is a real mystery to me too. ?
?
Tom, I suggested a test for the bandswitch area? was it not practicle? ?
?
?
That is interesting.? The tube manual indicates that -3 volts should be there.? Have you replaced C5 and C8?? Minor leakage in either could cancel the expected negative bias on G3 of the 6K8.? From the QST article, I expect that there are unintended interactions when the expected voltages are out of spec.
In looking at the schematic for the umpteenth time, I see how the upper band tank coils are returned to ground through switch 7D rotor that shorts the bottom of the band coils to ground.? Not sure how L13 is grounded when the band switch is in the BCB setting.? If you measure the DC resistance from the grid cap to ground you should measure R12 (33 ohms +/- 20%) plus the coil resistance for each band switch setting.? Is this the case???
Measuring from the switch side of R12, you should measure just the tank coil resistance to ground.? That resistance should increase as the band switch connects to the next lower tank coil.? If you don't see the coil resistance then perhaps the oscillator stator sections of either C1 or C2 is grounded?
Likewise, the switch side of C37 should measure the LO coil resistance to ground for each band switch setting.? Like the above, each lower band coil resistance will be higher.? Is this the case?
Remote troubleshooting is a s-l-o-w process,
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Sunday, March 9, 2025 at 11:47:14 AM CDT, Allthumbs via groups.io <btse1@...> wrote:
Thank you, Jim. The 6K8 control grid (grid cap) measures 0.00 vdc, pretty much as expected.
--
don??? va3drl
|
Tom,? well we all get worn down and discouraged when things beat us. Also, after concentrating on something, it is hard to see the forest ?for the trees.? So perhaps it is time for a break.? Most of us just dab in this, and learn bits and pieces from here and there. Maybe we [ me anyhow] speak over your head, since we as individuals don’t know “just what you know”. That is always a problem. It is best to speak up; this is not a competition, it is a mutual assistance group of non-professionals down to first time dabblers. ?While you have your nose in the Rosin smoke, I’m looking into info on the 6K8? and other converters, and so learning a little bit. ? For some time in the future, as to your problem , that cap must be C7 a 2200??F [or these days maybe 2200pF] connected to the cathode? and not C37 connected to the bandswitch.? You had a good voltage on the cathode, so it [and C8] don’t seem to be shorted and my guess is they are ok but cant be sure. ? I wonder if you understood the simple resistance tests on the coil area? that I sent before. ??? -- don??? va3drl
|
Re: SX-62 alignment instructions
Oh Jim, my ONLY intent of this was? about removing a tube or otherwise preventing an antenna input while at the same time? using the mixer tube as a buffer between the Sig generator and the first IF transformer.?? There are different methods all depending on the circuit and its accessible points. ?It is part of my response to his original question. ?
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Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Jim Whartenby via groups.io
Sent: Sunday, March 16, 2025 4:32 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SX-62 alignment instructions? Your IF alignment instructions are missing an important caveat.? You must lower the SG output to below where the AVC begins to operate.? Not doing so will cause the IFTs to be misaligned.? With the volume and RF gain controls at maximum, the SG modulation should be heard but just barely over the background noise as the IF alignment progresses.?? Better to measure the voltage at the speaker terminals and not rely too much on one's hearing, especially as we get older, right Richard?.? This IF alignment method would be useable for all superhetrodyne receivers, not just hallicrafters. Might as well mention that if the radio has a crystal filter in the IF chain, the frequency that this crystal passes through the filter is used to align the IFTs, not the SG dial reading. -- don??? va3drl
|
Re: SX-62 alignment instructions
Thanks, I tried(the correct way), but I'm having issues with the FM, it has so much gain in FM that the oscillator stops, until I reduce the RF gain, I have to align it on 2-3? on the RF gain to get anything out of it. going to start over and try again.
toggle quoted message
Show quoted text
Scott, as an aside, this is what they say for the S-20R .. they use the converter but disconnect it from upstream.
?
Thanks!, I didn't look up which pin did what, I thought it could have been the plate, and pulling the tube would isolate the RF coming in. SX-62B
Scott, It is a SX-62 {no suffix} ?
Since the signal is injected on the grid, it would seem the tube would have to be in service. ??
?
--
don??? va3drl
|
Re: SX-62 alignment instructions
Don Your IF alignment instructions are missing an important caveat.? You must lower the SG output to below where the AVC begins to operate.? Not doing so will cause the IFTs to be misaligned.? With the volume and RF gain controls at maximum, the SG modulation should be heard but just barely over the background noise as the IF alignment progresses.??
Better to measure the voltage at the speaker terminals and not rely too much on one's hearing, especially as we get older, right Richard?.? This IF alignment method would be useable for all superhetrodyne receivers, not just hallicrafters.
Might as well mention that if the radio has a crystal filter in the IF chain, the frequency that this crystal passes through the filter is used to align the IFTs, not the SG dial reading. Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
Scott, as an aside, this is what they say for the S-20R .. they use the converter but disconnect it from upstream.
From: [email protected] [mailto:[email protected]] On Behalf Of Scott Petersen via groups.io
Sent: Saturday, March 15, 2025 2:48 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SX-62 alignment instructions ? Thanks!, I didn't look up which pin did what, I thought it could have been the plate, and pulling the tube would isolate the RF coming in. SX-62B
Scott, It is a SX-62 {no suffix} ? Since the signal is injected on the grid, it would seem the tube would have to be in service. ?? ?
--
don??? va3drl
|
SR-160 Vernier Dial Lubricaion
Hi All,
?
I am restoring an SR-160 that has been dormant for some time.? The vernier dial does rotate through it's full rotation but does so sluggishly, getting stuck periodically.? Does anyone have any suggestions regarding lubrication of the vernier dial mechanism (type of lubricant, places to lubricate, etc)?
?
--
|
I certainly appreciate all the advice, hints and overall help I received in my attempt to resurrect this fine old survivor but, for me at least, I think the journey is over. Properly servicing the mixer section means that the LO coil assembly will have to be sufficiently lifted or even removed from the chassis. I found that doing so is beyond my ability. This assembly is connected to the main tuning capacitor by a connection that I am unable to de-solder in such a tight spot. It would take a heftier soldering iron than either one of the two I have, and even if I could, I doubt my ability to reconnect it. I'm a hobbyist, not a technician with the experience to deal with such a challenge.
?
It's a pity--I think this receiver would be very serviceable if repaired, and be capable of performing as well as most vintage, single conversion receivers lacking a crystal filter. So, back on the shelf it goes. I'll hold on to it for a while--after all, not too many people are going to want to tackle a receiver with challenges like this one.
?
Thanks again,
?
Tom
On 03/09/2025 6:11 PM PDT don Root <drootofallevil@...> wrote:
?
?
Jim & Tom?
The Hexode signal grid has a max? or min? voltage of -3? presumably to the cathode [depends who you read] , but my conclusion from a Sylvania ??blurb? is that it can go as positive as -3 volts, and as negative as -30 where there is little transconductance, and so is often connected to the AVC, but apparently not in the S-20R. but that does not help the situation.
As Jim says, on band 1 ?there is no ground, and I say there is no control of THAT grid voltage by ground, AVC or other, so it floats. On the other bands the bottoms of ?3,2,1 can be grounded [all depending] providing a DC ground ?but it goes thru the coil{s} so is strange to me. But band 1 is a real mystery to me too. ?
?
Tom, I suggested a test for the bandswitch area? was it not practicle? ?
?
?
That is interesting.? The tube manual indicates that -3 volts should be there.? Have you replaced C5 and C8?? Minor leakage in either could cancel the expected negative bias on G3 of the 6K8.? From the QST article, I expect that there are unintended interactions when the expected voltages are out of spec.
In looking at the schematic for the umpteenth time, I see how the upper band tank coils are returned to ground through switch 7D rotor that shorts the bottom of the band coils to ground.? Not sure how L13 is grounded when the band switch is in the BCB setting.? If you measure the DC resistance from the grid cap to ground you should measure R12 (33 ohms +/- 20%) plus the coil resistance for each band switch setting.? Is this the case???
Measuring from the switch side of R12, you should measure just the tank coil resistance to ground.? That resistance should increase as the band switch connects to the next lower tank coil.? If you don't see the coil resistance then perhaps the oscillator stator sections of either C1 or C2 is grounded?
Likewise, the switch side of C37 should measure the LO coil resistance to ground for each band switch setting.? Like the above, each lower band coil resistance will be higher.? Is this the case?
Remote troubleshooting is a s-l-o-w process,
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Sunday, March 9, 2025 at 11:47:14 AM CDT, Allthumbs via groups.io <btse1@...> wrote:
Thank you, Jim. The 6K8 control grid (grid cap) measures 0.00 vdc, pretty much as expected.
--
don??? va3drl
|
Re: SX-62 alignment instructions
Scott, as an aside, this is what they say for the S-20R .. they use the converter but disconnect it from upstream.
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Scott Petersen via groups.io
Sent: Saturday, March 15, 2025 2:48 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] SX-62 alignment instructions? Thanks!, I didn't look up which pin did what, I thought it could have been the plate, and pulling the tube would isolate the RF coming in. SX-62B
Scott, It is a SX-62 {no suffix} ? Since the signal is injected on the grid, it would seem the tube would have to be in service. ?? ? -- don??? va3drl
|
Re: Interesting observation concerning crystals...
All boxed up and ready to go out in the mail tomorrow.? You'll get a notice from my Pirateship account.
73 - Steve, KW4H
On Saturday, March 15th, 2025 at 9:58 PM, Tom Smith <n5ama@...> wrote:
Hi Steve,
I’ll put a check in the mail to you tomorrow for three of them. Thanks for making them available.
?
Tom N5AMA
|
Re: WTB SR-160 Front Panel
Walt is **THE MAN** !!!
73/jeff/ac0c
alpha-charlie-zero-charlie
On 3/15/2025 1:44 PM, Scott WA9WFA via
groups.io wrote:
toggle quoted message
Show quoted text
First off, I need to apologize to the guys here
that responded to my SR-500 Tornado and SR-160 WTB post and
didn’t hear back from me. ?I was on the road.
Next, while on the road, I stopped by Walt
Cates' QTH in Kansas City where I had the pleasure of meeting
him and buying his SR-500 Tornado and PS-500AC. ?It’s in my
shack and on the air. ?My first contact was with W1AW believe
it or not. ?
For several years Walt has been looking for an
SR-160 panel to replace this SR-500 panel. ?The Tornado panel
is the same as the 160 with the exception of the metal Tornado
label below the escutcheon. ?The metal label is removable.
?Walt wasn’t able to find one in all those years, but I
thought I would continue the search, so I know it’s a long
shot.
I just can’t leave a radio alone but prefer to
spiff up and putter with them. ?I think this would be a fun
spiff up project if a panel can be located. ?If not, fine, I
am delighted with the radio never-the-less! ?
73, Scott WA9WFA
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don Root
Allthumbs
waltcates
Jim Whartenby