Determining the correct voltages on output tube V9 6K6 doesn¡¯t tell you everything about why there possibly is no audio but it is a place to start trouble shooting. However I am not sure if that would be my first choice. Injecting an audio signal into the phono jack is a pretty good idea in my opinion as an overall check of a functioning audio system. If the system is not working then examining various portions of the system makes sense. Checking backwards from the speaker or earphone is the most logical approach.
Besides voltages, continuity checks with a VOM or DMM are important. I¡¯ve read about a great many no audio stories because the headphone jack contacts were dirty and not making contact. Same problem could occur if the contacts on S2A or S3A are dirty. Dirty tube pins another problem that socket voltages would miss. Bad or open solder joints are another possibility. Could be problems with the V8 audio amp circuit and as well as V9 audio output.
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Yes it is a selection on the front of the radio for phono input. I am checking voltages first but just had that idea this week looking at the schematic. And it does feed directly in. ? I can also take my heathkit generator and just input a low level tone on that jack after I check voltages
?
To add to this, just to make sure, the phono input is just a low level audio input to the audio amplifier. It does not need to be modulated. Its a suitable place to inject a low level audio tone. I have not looked at the schematic but typically a phono input is on a switch that connects the audio input to either the detector output or the phono jack. On 3/28/2024 2:17 PM, Bruce Collins wrote: First find out if you even have proper voltages on the pins of the 6K6!
If the OT primary is open¡ nearly zero volts on the plate, pin 3. If no
screen voltage on pin 4¡ no audio. If the 6K6 is not turned on¡ no
voltage on pin 8, the cathode and again, no audio.
---------- Forwarded message ---------
From: *Keith* <kd4avp@... <mailto:kd4avp@...>>
Date: Thu, Mar 28, 2024 at 2:40?PM
Subject: [HallicraftersRadios] SX-100 phono input
To: <[email protected] <mailto:[email protected]>>
Question for the group....
Will be working on the SX100 again this weekend.
I am not getting any sound from the speaker.
As stated before, I tap across the 6k6 pin and get some static on the
speaker.
Would it make sense to feed an modulated signal into the phono input to
just see if it makes noise?
Use my IG102 signal generator and either internal modulation or another
tone generator into the IG102. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998
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To add to this, just to make sure, the phono input is just a low
level audio input to the audio amplifier. It does not need to be
modulated. Its a suitable place to inject a low level audio tone. I have
not looked at the schematic but typically a phono input is on a switch
that connects the audio input to either the detector output or the phono
jack.
toggle quoted message
Show quoted text
On 3/28/2024 2:17 PM, Bruce Collins wrote: First find out if you even have proper voltages on the pins of the 6K6!
If the OT primary is open¡ nearly zero volts on the plate, pin 3. If no
screen voltage on pin 4¡ no audio. If the 6K6 is not turned on¡ no
voltage on pin 8, the cathode and again, no audio.
---------- Forwarded message ---------
From: *Keith* <kd4avp@... <mailto:kd4avp@...>>
Date: Thu, Mar 28, 2024 at 2:40?PM
Subject: [HallicraftersRadios] SX-100 phono input
To: <[email protected] <mailto:[email protected]>>
Question for the group....
Will be working on the SX100 again this weekend.
I am not getting any sound from the speaker.
As stated before, I tap across the 6k6 pin and get some static on the
speaker.
Would it make sense to feed an modulated signal into the phono input to
just see if it makes noise?
Use my IG102 signal generator and either internal modulation or another
tone generator into the IG102.
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
|
First find out if you even have proper voltages on the pins of the 6K6!? If the OT primary is open¡ nearly zero volts on the plate, pin 3. If no screen voltage on pin 4¡ no audio. If the 6K6 is not turned on¡ no voltage on pin 8, the cathode and again, no audio.? ---------- Forwarded message --------- From: Keith <kd4avp@...>Date: Thu, Mar 28, 2024 at 2:40?PM Subject: [HallicraftersRadios] SX-100 phono input To: < [email protected]> Question for the group.... Will be working on the SX100 again this weekend.? I am not getting any sound from the speaker. As stated before, I tap across the 6k6 pin and get some static on the speaker. Would it make sense to feed an modulated signal into the phono input to just see if it makes noise? Use my IG102 signal generator and either internal modulation or another tone generator into the IG102.
|
Question for the group....
Will be working on the SX100 again this weekend.?
I am not getting any sound from the speaker.
As stated before, I tap across the 6k6 pin and get some static on the speaker.
Would it make sense to feed an modulated signal into the phono input to just see if it makes noise?
Use my IG102 signal generator and either internal modulation or another tone generator into the IG102.
|
12.47 volts AC on that tube.? It seems to be working. Just not strong on higher bands.? Maybe it's because it's out of case?? ? About s6 on 80 meters.?
Just to be sure, measure the ac voltage on the filament?of V11. Check CR10 and the cap that feeds it.
Check V11B pins 1 and 8 against the voltage chart in the manual.
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
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Walt, I got the VFO mechanically aligned. I had to modify a bristol key.? There was no possible way to get to that collar.? ?Its fixed now.? I trimmed up C122 and it seems ok now.
The calibrator has low output.? Its only maybe S3 or S4 on meter.? S1 on 20 meters. Not sure why.? I found a 6u8a in that spot. The fil wiring is stock. I put a 7059 in from the other rig. It now works but is weak.? Any thoughts?
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Just to be sure, measure the ac voltage on the filament?of V11. Check CR10 and the cap that feeds it.
Check V11B pins 1 and 8 against the voltage chart in the manual.
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
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Show quoted text
?
Walt, I got the VFO mechanically aligned. I had to modify a bristol key.? There was no possible way to get to that collar.? ?Its fixed now.? I trimmed up C122 and it seems ok now.
The calibrator has low output.? Its only maybe S3 or S4 on meter.? S1 on 20 meters. Not sure why.? I found a 6u8a in that spot. The fil wiring is stock. I put a 7059 in from the other rig. It now works but is weak.? Any thoughts?
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Re: SR2000 initial power up
Walt, I got the VFO mechanically aligned. I had to modify a bristol key.? There was no possible way to get to that collar.? ?Its fixed now.? I trimmed up C122 and it seems ok now.
The calibrator has low output.? Its only maybe S3 or S4 on meter.? S1 on 20 meters. Not sure why.? I found a 6u8a in that spot. The fil wiring is stock. I put a 7059 in from the other rig. It now works but is weak.? Any thoughts?
C
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With modern amateur transceivers that have general coverage receiver sections and a bandscope, finding and listening to foreign broadcast station is like 'shooting fish in a barrel". Just dial in the frequency to one of the SWL bands like? ?49M,? 31M? etc. and you can easily spot their AM signals on the bandscope, even easier if the scope has a waterfall feature. Doing that is easy - the tough part is finding anything decent to listen to anymore - most of what I hear these days are either in Spanish, another foreign language that I don't understand or annoying religious programming. Many of the interesting SWL stations I used to listen to back in the 60s-80's have either gone off the air or moved to the internet, presumably because of the high cost of running/maintaining expensive high power AM transmitters and antennas for the SWL bands.
?
Bob K3AC
In a message dated 3/27/2024 5:14:05 PM Eastern Daylight Time, drootofallevil@... writes:
I started with ¡°Scott¡± but then saw Floyd at the bottom and changed it, ?so oops!
There are the SW broadcast bands, but also ?other intermittent uses, so ?it might be one way intermittent station, or two-way , but often ?you can only hear one station from your place.
?
?
?
Floyd , I wonder if you are tuning on ham bands? If so you might pick up a good signal ?from station A ?with a good path to you, but station B? might be on the same frequency with a good path to A? but not a good path to you. Path depends on locationS and often on the ionization from the sun at the time¡ etc? etc.
?
?
Scott - not sure what you're asking, but I'll assume you're asking about establishing a contact on one of the HF bands.? Many modern transceivers have scanner capability, but I've never heard of anyone using it.? Most modern transceivers have a spectrum display where you can see activity on a band.? ?It's simple to get to his frequency - spin the knob until the cursor is on the visible station, or in some cases the spectrum display is a touch screen and all you have to do is touch the visible station and you're hearing him.? I think the problem with a scanner on the HF bands is that it would be stopping on everything - someone tuning up, etc.? Some folks use the scanner capability on the higher bands like 6 or 2 meters.
73, Floyd - K8AC
--
don??? va3drl
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I started with ¡°Scott¡± but then saw Floyd at the bottom and changed it, ?so oops! There are the SW broadcast bands, but also ?other intermittent uses, so ?it might be one way intermittent station, or two-way , but often ?you can only hear one station from your place. ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of don Root
Sent: Wednesday, March 27, 2024 4:56 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] An easier way?? Floyd , I wonder if you are tuning on ham bands? If so you might pick up a good signal ?from station A ?with a good path to you, but station B? might be on the same frequency with a good path to A? but not a good path to you. Path depends on locationS and often on the ionization from the sun at the time¡ etc? etc. ? ? Scott - not sure what you're asking, but I'll assume you're asking about establishing a contact on one of the HF bands.? Many modern transceivers have scanner capability, but I've never heard of anyone using it.? Most modern transceivers have a spectrum display where you can see activity on a band.? ?It's simple to get to his frequency - spin the knob until the cursor is on the visible station, or in some cases the spectrum display is a touch screen and all you have to do is touch the visible station and you're hearing him.? I think the problem with a scanner on the HF bands is that it would be stopping on everything - someone tuning up, etc.? Some folks use the scanner capability on the higher bands like 6 or 2 meters.
73, Floyd - K8AC
--
don??? va3drl
-- don??? va3drl
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Yes- there is. Here's a neat way to find Shortwave? stations? broadcasting in English (or other languages that you choose). It's an app you put on your phone or PC and you enter various parameters and it gives you specific SWL stations that you may be able to receive at your location:
?
?
Happy SWLing,
Bob K3AC
In a message dated 3/27/2024 4:55:39 PM Eastern Daylight Time, drootofallevil@... writes:
?
Floyd , I wonder if you are tuning on ham bands? If so you might pick up a good signal ?from station A ?with a good path to you, but station B? might be on the same frequency with a good path to A? but not a good path to you. Path depends on locationS and often on the ionization from the sun at the time¡ etc? etc.
?
?
Scott - not sure what you're asking, but I'll assume you're asking about establishing a contact on one of the HF bands.? Many modern transceivers have scanner capability, but I've never heard of anyone using it.? Most modern transceivers have a spectrum display where you can see activity on a band.? ?It's simple to get to his frequency - spin the knob until the cursor is on the visible station, or in some cases the spectrum display is a touch screen and all you have to do is touch the visible station and you're hearing him.? I think the problem with a scanner on the HF bands is that it would be stopping on everything - someone tuning up, etc.? Some folks use the scanner capability on the higher bands like 6 or 2 meters.
73, Floyd - K8AC
--
don??? va3drl
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Floyd , I wonder if you are tuning on ham bands? If so you might pick up a good signal ?from station A ?with a good path to you, but station B? might be on the same frequency with a good path to A? but not a good path to you. Path depends on locationS and often on the ionization from the sun at the time¡ etc? etc. ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Floyd - K8AC
Sent: Wednesday, March 27, 2024 4:43 PM
To: [email protected]
Subject: Re: [HallicraftersRadios] An easier way?? Scott - not sure what you're asking, but I'll assume you're asking about establishing a contact on one of the HF bands.? Many modern transceivers have scanner capability, but I've never heard of anyone using it.? Most modern transceivers have a spectrum display where you can see activity on a band.? ?It's simple to get to his frequency - spin the knob until the cursor is on the visible station, or in some cases the spectrum display is a touch screen and all you have to do is touch the visible station and you're hearing him.? I think the problem with a scanner on the HF bands is that it would be stopping on everything - someone tuning up, etc.? Some folks use the scanner capability on the higher bands like 6 or 2 meters.
73, Floyd - K8AC -- don??? va3drl
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I was referring to both Ham and SW. I realize the continuous stations were listed, and even before that, the radio dials had country listings on them,
but the individaul transmissions are sporadic, and sometimes hard to catch, I thought there may be a connect frequency, and move to another to continue conversations, some of this happens on the 10m repeater I can hear.
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Scott, are you referring to the ham bands or the SW bands?
I can speak only to the SW bands.
Back in the day, you could cruise the popular SW bands like 49m and 31m in the evening, and there was always plenty to listen to.
You could also tune in specific stations because most of the electronics magazines, like
Popular Electronics?and Electronics Illustrated,?published SW broadcasting schedules in each issue.?
? ? ? ? ? ? ? ? ? ? ? ?Joe Connor
On Wednesday, March 27, 2024 at 04:13:42 PM EDT, Scott Petersen <s-petersen@...> wrote:
I have been a SWL listener for along time, and it is so haphazard to find users on the air, are there common frequencies to start conversations? In modern days there are scanners that can catch conversations easily. Was tuning through the bands randomly
the way it was done before scanners?
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Scott - not sure what you're asking, but I'll assume you're asking about establishing a contact on one of the HF bands.? Many modern transceivers have scanner capability, but I've never heard of anyone using it.? Most modern transceivers have a spectrum display where you can see activity on a band.? ?It's simple to get to his frequency - spin the knob until the cursor is on the visible station, or in some cases the spectrum display is a touch screen and all you have to do is touch the visible station and you're hearing him.? I think the problem with a scanner on the HF bands is that it would be stopping on everything - someone tuning up, etc.? Some folks use the scanner capability on the higher bands like 6 or 2 meters.
73, Floyd - K8AC
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On Fri, Mar 22, 2024 at 12:19 PM, HF wrote:
Wow, I hadn't known about this Winkeyer feature!? I'm curious about how it handles the initial delay.? I scanned the manual and couldn't find the answer.? Are all the dits and dahs delayed by the lead time between paddle contact closure and output?? Or does only the first element since the PTT output last? dropped have a delayed start?? I think it'd be difficult to use if everything sends out 30-40 ms after my fingers feel the mechanical contact at the paddle.
I checked this out today and the leadin and tail delays do function when you're just in keyer mode without the PC involved.? The first code elements are delayed by the amount of the specified lead time.? At 20 ms delay, I think I could get used to it.? 30 ms was very difficult to deal with.? I found that the keyer queues only two code elements, so if you start sending too soon, key presses might get lost.? A ten ms delay is hardly noticeable. 73, Floyd - K8AC
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Scott, are you referring to the ham bands or the SW bands?
I can speak only to the SW bands.
Back in the day, you could cruise the popular SW bands like 49m and 31m in the evening, and there was always plenty to listen to.
You could also tune in specific stations because most of the electronics magazines, like Popular Electronics?and?Electronics Illustrated,?published SW broadcasting schedules in each issue.?
? ? ? ? ? ? ? ? ? ? ? ?Joe Connor
On Wednesday, March 27, 2024 at 04:13:42 PM EDT, Scott Petersen <s-petersen@...> wrote:
I have been a SWL listener for along time, and it is so haphazard to find users on the air, are there common frequencies to start conversations? In modern days there are scanners that can catch conversations easily. Was tuning through the bands randomly the way it was done before scanners?
|
I have been a SWL listener for along time, and it is so haphazard to find users on the air, are there common frequencies to start conversations? In modern days there are scanners that can catch conversations easily. Was tuning through the bands randomly the way it was done before scanners?
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More on matching tubes. Burle color coded their tubes for matching purposes. So, IF you get NEW Burle tubes color coded blue you are perfect. Red and green will work but not to maximum efficiency. Black will not work at all.?
You can test individual tubes in the SR-2000. Pull one of the 8122's plug the hole with a rag or tissue to ensure the remaining tube has good air flow. Set the mic and rf drive to minimum. In low power key up and adjust the bias for 100ma. Measure and record
the bias voltage on the grid of the tube. Repeat the process with as many tubes you have. You are looking for -25 to -31v tubes.
ref
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
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From: Walt Cates <cateswa@...>
Sent: Wednesday, March 27, 2024 12:23 PM
To: [email protected] <[email protected]>
Subject: Re: [HallicraftersRadios] SR2000 initial power up
?
Caution, the 8122's must be matched.
Walt Cates, WD0GOF
?
A majority of acceptance is not proof of correctness.
Thank you walt. I will tackle this after work today.
Radio number 2 really runs great!? ?The RX and TX audio is much better sounding on this rig.? I am using a classic EV664. I ran it on SSB low on 80 meters for several hours.? Drift is minimal.? The Dial is the only problem I can find at this point.?
A fellow ham is sending me a NEW Load capacitor for Radio number 1, It is exactly the same cap!? ?He also had a new 8122 tube!!? He is mailing that to me as well.??
Radio number 1 will get a new load cap and then I need to find out why audio is thin.? It passes NO audio below 400hz.? I already tried the shift L15 and 16 over and that did help slightly.? I fear the Xtal filter has shifted?? ?The LSB Xtal aligns to .520
so that should be close enough?? I might try to series a 5pf cap to see if I can kick it up slightly.?
Radio number 1 also drifts UP in frequency.? Slightly up and never stops.? I have to very slightly adjust vfo back down over the course of a few minutes. This goes on for hours.?
Walt can you suggest what to do? Just change all the mica caps in VFO? Or try to change just a few??
Clark
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Re: SR2000 initial power up
Hi Clark,
I have a matched pair of NOS Burle 8122
tubes (Green Dot) that are surplus to my needs if you want to pick
up a couple of spares. I tested and de-gassed them in my SR-2000
in June of 2021 and would be happy to confirm they are still good
if you are interested. $550 for the pair (shipped).
Bob,? K7DYB
On 3/26/2024 9:23 PM, W7WRX wrote:
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Update.
Radio number 1 has a fault with the ball bearings missing on load
cap shaft. This allows contact.? Ordered ball bearings.??
Radio number 2 is alive!? ?Its band switch was hot switched. I
repaired it.? FULL power on 80 now!? ?
The CAL would not work. I found a 6u8a installed in in the V11
spot!? ?I checked the wiring. its factory. I installed a 7059 from
the other rig and BINGO calibrator works.
The output was low, I found the Slug up front was out of
adjustment. I checked this as walts document said it could cause
this. Sure enough, one tweak and it has full drive and power.
The DIAL is off 20 KC.? ?I need to deal with that.? Not sure what
to do...? Adjust the Dial or attempt to align it over. That seems
far off.? It tracks fine and maintains the same 20KC offset across
the band.
Making progress!!!
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Walt - guess I responded to your suggestions on my other thread regarding sideband suppression.? Guess the two problems are closely related.??
Floyd
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Bruce Collins
waltcates
don Root
Floyd - K8AC
Robert Kembel