[Peter Wieck]

On Aug 11, 10:35 am, Bret Ludwig wrote:
John:

I have tried (breadboarded) two circuits. Both had their merits, but
the 6BQ5 circuit was just too 'little'. I am tempted to try one or two
more including one based on the 7591A, and one possibly with different
drivers before I bend and punch sheet metal.

So tell us, what drives you to fool with such an undesireable tube
such as the 7591, expensive, not terribly available?

That I have a bunch in hand... no more.

Peter Wieck
Wyncote, PA