[R-390] Training manual

[James A. (Andy) Moorer]

It uses two 5651 tubes (V608 and V609) in series to set the voltage. Then it 
uses an active series regulator circuit employing a 6BH6 as the error 
voltage amplifier (V607) followed by two 6082 triodes as cathode followers 
(V605, V606).

The 5651 is sorta like an 0A2 or 0B2 except that the voltage is supposed to 
be more precise.

James A. (Andy) Moorer
www.jamminpower.com

----- Original Message ----- 

> Fellows,
>
> I have the following mail from the boatanchor pages.
> Are 5651 the regulator tubes used in the R390?
>
>