Quote:
Originally Posted by radio nut
Was just watching a documentary on the history of old trains and the screen is showing old film and as an the scene changes from one train to another and the background is a lot brighter it starts buzzing
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OK, need a second test. Remove your antenna connection and short the set terminals
while the set is buzzing. If the result is no buzz, then do the test that I proposed in the 9th post in your old thread.
http://www.videokarma.org/showthread.php?t=259882
This test did not pinpoint the problem before since there was another cause for the buzz then.
If this tests now reduces or eliminates the buzz, then the problem is signal overload.
The most obvious cause is too strong a signal.
It also can be caused by misadjustments of gain setting (including local / distant switch) or gassy tube in the tuner, IF, or sync tubes. Most Muntz sets did not use them, but if your Muntz has a tube labeled either AGC or AGC Keying, that is a real possibility. If it has keying, (and only if) then also suspect the tube that provides the signal that is keyed, which often is the video output tube.
James.