Re: Info on designing Tube circuits wanted

And whatever you do and whomever you emulate, let it not be Andre.
What you will get from this source is non-working designs using
boutique tubes of questionable utility with uniformly wretched
results.

Most everyone else here has given you reasonable and independently
verifiable advice. Patrick Turner has forgotten more about tube
systems and design than the rest of the NG collectively.

The advice I would give if you have the time and the patience would be
to obtain a full-stock Dynaco ST-70 and take it through any and many
of the various modifications that surround its design from its
initiation into the Audio Market in 1961 - ultimately ending with
Patricks design.

You will learn more about the care and feeding of tube amps from that
process in a measured and well-supported environment than most other
options. This is by no means the only way to go, but it is a way to
take a proven, common design through vast numbers of proven
modifications - and at a relatively low cost using easily obtained
parts. You should be able to take an ST-70 through most of its
potential paces for less cost than the simple cost of tubes for an
"Andre Special" amp.

Peter Wieck
Wyncote, PA

.

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