Fred Nachbaur wrote:

Max Holubitsky wrote:


[...]


Ok, but in a preamp they can sound great... and not everyone uses 300B's. I
think they're a better choice than a 12AX7 in many applications where 12AX7s are
used.

What??? It's a completely different tube. Just because the pinout is the
same doesn't mean that it's interchangeable. In some circuits it might
work half-assed, but don't be too surprised that it doesn't work properly.

12AU7 shines as a driver (or similar services like phase splitters,
etc.), whereas the 12AX7 is optimized for gain. It's like comparing
apples and oranges.

This is of course all out the window when it comes to musical production
amps, and anything goes as far as plunking in wrong subs "just because."

I meant that some circuits which are designed for use with 12AX7's, such as drivers
for output stages, could be re-designed for use with a low mu tube like a 12AU7 to
better effect. I don't mean that it could be used as a plug in sub, although it may
have sounded that way.



Cheers,
Fred
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