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RE: Schematic?

The '3 tube' solution is apparently what both the ST70 and ST120 have.

I don't remember the order of 'gain' for the interchangeable tubes of the '12 series'. Can you put them in order from LOW to HIGH gain?

I don't know enough to know WHY pin #7 has a 1 meg resistor to it and is @110v while pin #2 has no such resistor and is at 115v.....
Shouldn't these be symmetrical? Do you adjust the AC balance pot ONCE per tube change to get the SAME 370 volts OUT? The 20k resistors are listed as 2 watts, which is a LOT, IMO, Is the DC balnance pot for 'bias'? That makes a little sense because I see downstream of that .2v whcih might be the bias voltage.....whatever the current works out to?

Bob Lantino mentions 5 tubes OK for this circuit. 12AU7 / 12BH7 / 5963 / 5814 / 6189 AND has a CCS in the circuit in the form of an LM334 from TI....... I do NOT know what tube the amp ships with OR if any others are 'optional' or which to choose should I be given such a choice.....
Too much is never enough

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