Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

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Resto soon.....

Posted by Interstage Tranny on March 7, 2017 at 15:14:14:
Vintage tube gear can be amazing ! A 60 year old unit will need a tune-up, soon or sooner. The record player will probably need maintenance more often. So, it is definitely amazing that a sixty year old, original amp and tuner still play at all.

RCA console amps of that era usually used 6BQ5/EL84 output tubes. Their power supplies were varied, but they will/do need some electrolytic capacitors replaced, as well as possibly the original solid state diodes. Likewise, the final stage coupling caps, connected to the EL84s, probably require immediate replacement. They are either .027 uf or .047 uf.

As the original amps "warm-up," it is possible the power supply caps or the coupling caps "derate" or leak voltages. That can "cut-off" the tubes as you mention. How is the hum level ?