Quote:
Originally Posted by Penthode
I viewed the YouTube video and you either have an IF alignment problem or a problem in the video amplifier (open peaking coil). The black streaking suggests the phase response is very bad.
Stagger tuned stages are optimised for both correct phase and frequency response. It is essential that the manufacturers alignment instruction be followed to the letter.
But I must ask, do you understand the concept of the split sound design and vestigial sideband demodulation? Because unless you do, you will continue to go around in circles.
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There are 6 peaking coils after the video det, all check good resistance wise.
as was mentioned earlier the 1st IF coil L9 was broken and is new, and thus the hunt for a stable freq generator
have not had a chance to try to adjust it again.
Also, as someone said who has worked on these things, "the 4 720 pf coupling capacitors in the picture IF section can be troublesome."
if adjusting L9 does not help much, they are next