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#2
05-14-2020, 06:41 PM
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I have not. I ordered some spares a while back and they've been delayed. That being said, since this is an AA5 for all intents and purposes, I might could borrow some known good ones from my AM radio and see if that has any impact.
I think I have a signal generator set up somewhere. Would there be any value in checking my audio section with one? I know my speaker output is good since I'm getting some audio hum from it, so it has to be a breakdown somewhere in the signal line, right?
__________________
To keep your tubes running smoothly, make sure to dust underneath the glass as well. 
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#4
05-15-2020, 02:45 PM
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The audio stage is humming, but I'm not getting any signal through. I can get a video of the noise if that will help.
And yeah, I'll pull some tubes from working sets to see if that makes any difference.
__________________
To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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#5
05-15-2020, 03:20 PM
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Went ahead and created a video: https://www.youtube.com/watch?v=Nyrr8iUFRzE
I also tried new tubes for everything except the 35Z5. I don't have any spares of that for now, but it also doesn't seem like the problem is in the power supply. I don't believe I have an RF generator, but I do have a digital signal generator I could set up. I haven't used it before but it looks like it might work for running some tests.
__________________
To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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#6
05-15-2020, 06:09 PM
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Again, I think the audio section is ok... I hear slight hum which changes with volume control rotation... some volume control scratch ... hum increase with body capacitance... noise from band switching. Do you get noise or change in noise as you connrct a wire to the antenna terminal?
What is the frequency range of the signal generator? can it generate a square wave? (rich in harmonics). jr
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#7
05-16-2020, 09:54 PM
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Looks like it can, yeah. I'll have to do a little research into the specific functionality (It's a sort of combo oscilloscope and signal generator) but the interface definitely allows for square waves.
__________________
To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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