Please note that the phase inverter is done by V10 and V20 while the 12AT7 are buffer-amps AFTER the PI, so it would make sense to have these 4 tubes matched! (1 pair 12AX7 + 1 pair 12AT7)
Tubeset includes:
3x RT003
ECC83-Cz TAD Premium Selected
1x RT104 - Quad
6L6GCM-STR REDBASE TAD PREMIUM Selected
The Bias of the Power Tubes should be set to approximately 28-32 mA.
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