5) TUBE COMPLIMENT AND EXTERNAL BIAS JACKS AND ADJUSTMENT
From left to right:
V1 – JJ 12AX7/ECC83S (input stage 1 for BRIGHT and NORMAL channels)
V2 – JJ 12AX7/ECC83S (gain stage 2 and tonestack driver)
V3 – JJ 12AX7/ECC83S (phase inverter for power amplifier)
V4 – JJ E34L
V5 – JJ E34L
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