08-10-2015, 03:05 PM
The RCA tube sub. guide for emergency services lists the 25L6 as a sub for a 25A6. Filament power is the same in both but looks like the 25L6 has more gain.
DC resistance isn't the same as impedance so you can't really say is it's mismatched or not.
http://radiorestorer.com/rcawartubes.PDF
DC resistance isn't the same as impedance so you can't really say is it's mismatched or not.
http://radiorestorer.com/rcawartubes.PDF