(1) RCA 812A Transmitting Tube | Micanol Base | Graphite Plates. Tube tests at 94 with 56 being the minimum score for a good tube (with 65% life remaining).
Item Tag: 812A
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(1) RCA 812A Transmitting Tube Micanol Base Graphite Plate Tests NOS TV-7B/U
(1) RCA 812A Transmitting Tube | Micanol Base | Graphite Plates. Tube tests at 100 with 56 being the minimum score for a good tube (with 65% life remaining).