Quote:
Originally Posted by Findm-Keepm
A-yep!
H-3 chassis (I have one with all the GE documentation/service lit) is 1970, so yes, the H-4 is 1971. The HE chassis PortaColor was introduced in 1972, 1973 introduced the 10JA chassis solid-state PortaColor, and 1974 was the 10QA Chassis PortaColor so your set is among the last of the all-tube models.
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IIRC, the H-4 is the first chassis to use a 12JF5 and a 1DG3 high voltage rectifier. It also had the safety capacitor on the PC board, near the horizontal output tube. The newer chassis, had the cap on a terminal strip on the side of the hv cage.
Slight differences in the power supply circuitry on the H-4 vs the earlier models.