I could be nuts, but the Sams manual calls X5 the "AGC amp" and it seems to take input from the 4th video IF as well as from the manual gain control. I am not good at puzzling out solid-state stuff. In any case, it behaves a lot like my RCA 630TS, whose manual gain was called the Picture control. A better label might have been the Twitchy control
.
Having full gain from the antenna at all times seems good for my setup, where the old TVs primarily receive signals from the in-house modulator.
The hum definitely sounds like 60hz. Trying a 12vdc supply should be easy enough. I haven't examined anything in the power supply yet, since it plays plenty bright and plenty loud. A p-s can have noise interference even if it supplies adequate voltage, though.
Phil Nelson
10-08-2011, 01:10 PM
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