Quote:
Originally Posted by Penthode
Sorry to hear it did not work. There are a few checks you can actually make to ensure the local oscillator is correctly on frequency.
Remember the three screenshots I posted last week? When you adjust the fine tuning control across its range, do you get the bright smeary image with the control fully clockwise, the slightly less bright but sharper image in the middle setting and at the full counter clockwise the weak image? This is very important for the proper vestigial sideband tuning I outlined and it would confirm the oscillator tuning is correct. This is how all properly operating 621TS and 721TS sets should work.
|
While I'm sure your 721 has been aligned to perfection, I think you're assuming the video IF in Chris's set is also in perfect alignment. I don't recall any mention that the image has ever respond to the fine tuning control, but Chris can confirm. It certainly would be reasonable that the Video IF on a nearly 75 year old TV could be compromised to the extent that the fine tuning control will not show such subtle fine tuning indications?