(Tube Complement)
V1- 12AX7, Clean Channel
V2- 12AX7, Reverb Send
V3- 12AT7, Reverb Driver/Mixing amplifier
V4- 12AX7, Lead Channel
V5- 12AX7, Phase Inverter
V6, V7- EL-34(6CA7)/6L6GC, 50 Watt Output
V8, V9- EL-34(6CA7)/6L6GC, 100 Watt Output
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
It is recommended to only use exact replacement tubes similar to what is installed at the factory.
Be careful when deciding to install other types of 6L6, 6V6, or EL-34 based tubes. Not all have the
same specs and some can’t handle the plate voltage of the amplifier.
Below is a limited list of comparable tube types:
Summary of Contents for Two-Rock Bi-ONYX
Page 1: ...Bi Onyx 5o 1oo Watt OWNERS MANUAL...
Page 9: ......
