Quote:
Originally Posted by Penthode
Yes you could. However you will hear the audio as you are tuning the slug long before you will have anything intelligible on the meter. Further you can hear when it is tuned as you will be tuning between the two distortion peaks if the discriminator is properly aligned for a perfect s response. The alignment remains suspect now because the settings have been changed. But even if the alignment is bad, you should hear something.
So the first rudimentary step is to try and bring the local oscillator back in line. I suspect a simple swap around of the tubes will yield some audio. Then we can focus on its precise final adjustment.
Which reminds me that split sound TV tuning is no different from an FM radio tuning which uses the discriminatory circuit. That is as you approach the correct tuning, the audio builds in level, becomes distorted then the loudest and clearest audio is received. Tuning further you reach a second distortion peak and the audio clears and is weaker. Many forget that either side of the best audio point is slope detection which is weaker and slightly distorted.
But here, we first need to hear any audio and the home in on it.
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I'm with you guys listening in earnest. I will do the tube swapping later this evening as I'm working late today. I have about a dozen 6J6 tubes so I can spend the next 2 days doing tube swaps if that's what's needed. We'll see. I'll update in a few hours. Thanks again so much for the interest and help!
08-25-2022, 05:22 PM
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