I bought another old organ today mainly for the 7591's and 12ax7's but it had some other tubes in it of which I do not know if they have any other uses.
6x8
6fh8
6fa7

They are rebranded RCA and raytheon mainly from the early 60's the 7591's were westinghouse and test good so I am pretty happy just need to get that ST-40 from my buddy.
Brian

Eico? One of the very best integrated PP amps made! I have only seen 6X8s in organs, Lowry I think. The other tubes I am not familier with. Were the 6FH8 (interesting tube, medium-mu 3 plate tetrode) and the 6FA7 (Diode-Sharp cut off twin plate tetrode) on the amp chassis with the 7591s and the 6X8s (medium-mu triode-sharp-cutoff pentode) in a large bank above the amp? The 6X8s might make good earphone amps. .45 watts SE class A1

How about a picture?

I love audio Pinups.


Mitch