Tube Complement - Two-Rock Sensor 22 Owner's Manual

V1- 12AX7,
V2- 12AX7,
V3- 12AX7WA,
V4- 12AX7WA,
V5- 12AX7,
V6-V7 - 6L6 (35/50 watt) or 6V6 (22 watt) Power Tubes
Each fine production tube is tested and matched to our exacting specifications. External bias
adjustment and test points are located on the chassis near the output tube sockets. A digital
voltmeter and small screwdriver are required for bias adjustment.
BIAS ADJUSTMENT PROCEDURE:
-Power up unit and connect proper speaker load
-DO NOT have an instrument connected to the input during the biasing procedure!
-Take unit off standby and allow a few seconds for the circuit to stabilize.
-Set multi-meter to read DC Volts
-With meter grounded to chassis and + probe inserted into test point, measure voltage.
-Using a small flat head screwdriver, insert into Bias pot and turn slowly adjusting Bias
level
Below is a limited list of comparable tube types:
6L6: 6L6GC, 7581, 5881
6V6: 6V6S, 6V6GT
Bias Ranges: Are measured and set in Volts. But can be measured and set in milliamps.
6L6 type tubes: .060V to .070V for 35watt version
6V6: tube types: .044V to .058V for 22watt version
Do not set bias higher than recommended as it can lead to tube failure or failure within the
amplifier!

Tube Complement

Input and Gain
Lead Input and Gain
Effect's loop buffer
Effect's loop buffer
Phase Inverter
Factory Setting: .064V
Factory Setting: .050V