On Sun, 20 Dec 2009 12:22:40 +0000 (GMT), Jim Lesurf
wrote:

I guess designers of commercial audio amps back then were more habituated
to using transformers than nowdays. I didn't know about the above, but
recall that some early domestic transistor amps included things like
coupling transformers.

How about a current guitar practice amplifier?

http://www.soundthoughts.co.uk/look/pignose.jpg

The idea is to sound like a proper valve guitar amplifier, and it sort
of does it.

d