Dynaco-Doctor Forum

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RE: Help me ID this ST70 mod

Posted by Idler on March 16, 2016 at 19:36:06:
The tubes are 6922's. It looks, on further consideration, like Curcio's Cascode Differential Amplifier Driver Amplifier w/ Active Current Source, which is a 4 tube driver board.

The Audio Research mod, according to ARCDB, has 6 to 7 tubes on the driver board.

Thanks for the response.

Idler