6
TUBE FUNCTION AND LOCATION CHART
Factory recommended tubes are listed under each location. Numbering sequence is left to right looking at FRONT of amp
starting with the row closest to front panel of amp.
Use only 12AX7 tubes as specified. These cannot be for other types.
V1 (FRONT)
Channel A Phase Inverter. Circled arrows above tube indicates Presence and Depth controls.
12AX7AC Ruby Selected
V2 (REAR)
Channel B Phase Inverter. Circled arrows above tube indicates Presence and Depth controls.
12AX7AC Ruby Selected
V3-V6
Power Tubes
6L6GCM Ruby Selected Fryette Tested & Matched
Sovtek 5881-6L6WGC Fryette Tested & Matched
Any good quality 6L6/5881 tube type will operate properly in this amplifier. Due to the unique, compact design, the
power tubes bias voltage is factory fixed for optimum operation. NOTE! The operating voltages and temperature are
optimized for this specific bias setting. To maintain safe operating temperature and maximum reliability, the bias is
factory fixed and must not be altered.
