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Their original circuit used 12AT7s




It was changed, in part, because some were complaining of a hair-trigger, and the switch to 12AU7s mitigated that to a degree. I don't even know if they offer the "standard gain" (12AT7) option anymore, but it only involves changing a few resistors if anyone needed the extra gain, or felt the 12AT7 was a better tube choice.

Note that some of the plate resistors listed as 36K in the 12AU7 version above list are now shown as 30K in the schematic you posted, TK. I'm not sure if that's due to the addition of CCS, or for some other reason.

My voltages never matched up to what was shown on the several schematics (different voltages indicated on each) that I was sent. All resistors were checked on an ohm meter prior to installation, so I always wondered if the discrepancy was due to differences among variations in 12AU7s.


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