http://bognerampforum.informe.com/xtc-t ... t2907.html
V1A: 1st stage for Green channel
V1B: 1st stage for Blue and Red channel
V2A: 2nd stage for Blue and Red channel
V2B: 3rd stage for Red channel
V3A: 3rd stage for Blue channel and 4th stage for Red channel
V3B: cathode follower feeding the tonestack
V4A: cathode follower for FX Send (in circuit only if effects loop is on)
V4B: FX Return (in circuit only if effects loop is on)
V5A&B: Phase Inverter
V6A: 2nd stage for Green channel
V6B: 3rd stage for Green channel