09-29-2014, 04:31 PM
OK went out and measured AVC voltage again and measured at grid of 78 QAVC tube. -1.75 tuned in and - 0.387 off tune so it looks like not enough AVC to move the meter. Now to figure out what is causing the lack of voltage there .
I didn't mention that I live in a very rural area and get virtually no am stations here so I am talking about my AMT 3000 transmitter as I mention a "strong" station. I do get Quite a few SW stations at various times though so the radio does seem to perform pretty well. As far as the code 125 version, I am getting excellent performance with stations all over the SW dial. But right now I am working on the early code 121 and trying to solve these one at a time.
I also swapped out all of the front end tubes with no change in performance at all just to be thorough.
Thanks,
Frank
I didn't mention that I live in a very rural area and get virtually no am stations here so I am talking about my AMT 3000 transmitter as I mention a "strong" station. I do get Quite a few SW stations at various times though so the radio does seem to perform pretty well. As far as the code 125 version, I am getting excellent performance with stations all over the SW dial. But right now I am working on the early code 121 and trying to solve these one at a time.
I also swapped out all of the front end tubes with no change in performance at all just to be thorough.
Thanks,
Frank
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