Fuse Chart
All Fuses are 3AG Type 250 Volt, SLO-BLO
Export 100 Volt Domestic Fuses: Export 220, 230, 240 Fuses:
2.5 - 50 Watt 2.5 - 50 Watt 1.6 - 50 Watt
3.2 - 100 Watt
3.2 - 100 Watt
2.5 - 100 Watt
(Tube Complement)
V1- 12AX7, Input and Gain
V2- 12AX7, Reverb Send & Return
V3- 12AT7, Reverb Drive
V4- 12AX7- Effects buffer & Mixing Stage
V5- 12AX7, Phase Inverter
V6-V7 - 6L6 (50 watt) & V8-V9 (100 watt)
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
Summary of Contents for Two-Rock Studio Pro 50
Page 1: ...OWNER S MANUAL...
