[ARC5] Audio stage impedances.

[WA5CAB at cs.com]

Although they are pin for pin compatible (have the same apparent basing), 
besides the significantly different heater requirements (you can't parallel 
any of them with the other tubes in a Command Set receiver because you would 
be putting 12 volts across 6 volt heater tubes), the other three tubes will 
require at a minimum a change in cathode resistor and probably screen 
dropping resistors.


> >      The 12A6 does not seem to be similar to any other tube. 
> >It is a low power beam pentode with an output of around 4 
> >watts.
> 
> Yes. Although a 6V6, 6K6, or 6F6 can be directly substituted for it if the 
> 
> filaments are all wired in parallel.
> 

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480