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TUBE FUNCTION AND LOCATION CHART
Each 12AX7/12AU7 has two sections/functions. Section A is shown first, Section B is second. Factory recommended
tubes are listed under each location (where two types are listed, the second listing is a factory recommended
substitution). Numbering sequence is left to right looking at FRONT of amp starting with the row closest to front panel of
amp.
Use only 12AX7 or 12AU7 tubes as specified. These cannot be switched between socket locations or
substituted for other types.
V1
Input Stage (post volume control).
12AX7 China
Phase Inverter.
12AX7WA Russia
V2
Voltage Amp/Driver Stage
12AU7 China
Voltage Amp/Driver Stage
V3
Input Stage (post volume control).
12AX7 China
Phase Inverter.
12AX7WA Russia
V4
Voltage Amp/Driver Stage
12AU7 China
Voltage Amp/Driver Stage
V5-V8
Power
Tubes
KT88 Sovtek
KT88 EH
KT88 Svetlana (SED)
