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I have a 1975 GE 19" which is mostly tube type but has a few transistors...it is a lot like a Portacolor chassis with a bigger HO tube and damper...I can remember a brightness problem on it too and it seems like I replaced the brightness limiter pot with a new pot mounted on the chassis and this cured it...however mine had a lack of brightness. Its been a while though. Seems like a lot of the adjustment pots on these GE's can be pretty flaky.
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