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Some of these early sets came with a circuit breaker. It’s all going to depend what kind of test equipment you have. Do you have a way to test the emission on the crt? If crt is weak trinitrons can’t really be rejuvenated. A DVM could test rectifier circuitry in the power supply. Sony’s are a unique animal so a manual is really the first thing you’ll need to start with. KV-1204 would be early ‘70’s product. Good luck.
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Sony Trinitron is my favorite brand.
My wish list:
Sony KV-7010U
Sony KV-1220U
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