Quote:
Originally Posted by zeno
Why not ! But usually a problem like this is voltage related. All 3 video
outputs are tied at the emitters to the B&W info. The colors come from the
demod to the bases.
LFOD !
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I've noticed that not all TVs are built this way. The Motorola I'm looking at mixes in the monochrome video signal earlier in the chain. Then there's tube sets which apply the monochrome signal to the cathode, and the colour info to the G1 of the CRT. If the Electrohome chassis does mix it in right at the emitter of the video outputs, then that's a good thing. Those three outputs are on a common heat sink, on a floating PC board suspended between the CRT tube sockets by stretched O rings.
The fact that the contrast control was directly controlling brightness, makes me wonder if the DC levels are correct in the video amplifier circuitry.