Two-Rock CLASSIC REVERB SIGNATURE, Owner'S Manual, Page: 7 / 10

FUSE CHART
All Fuses are 3AG Type 250 Volt, SLO-BLO
Export 100 Volt Domestic Fuses: Export 220, 230, 240
Fuses:
3.5 - 100 Watt 4x6L6 3.25 - 100 Watt 4x6L6 1.6 - 100 Watt 4x6L6
2.8 - 50 Watt 2x6L6 2.5 - 50 Watt 2x6L6 1.25 - 50 Watt 2x6L6
FOOTSWITCH
FET -Blue LED
BYPASS -Red LED
REVERB DEFEAT -Green LED
TUBE COMPLEMENT
V1- Preamp 12AX7
V2- Reverb send, reverb return 12AX7
V3- Reverb driver 12AT7
V4- Reverb /clean mix 12AX7
V5- Phase inverter 12AX7
V6, V7- Output 6L6GC (100 Watt), 6V6GT (40 Watt) or 6L6GC (50 Watt)
V8, V9- Output 6L6GC (100 Watt), 6V6GT (40 Watt) or 5AR4 Rectifier (50 Watt)
BIAS PROCEDURE:
1. Make sure the speaker is connected properly, then power up the amplifier.
2.
DO NOT apply any signal to the input during the biasing procedure!
3. Insert the volt meter’s positive probe into the bias test point socket
4. Connect the volt meter’s negative probe to chassis ground
5. Switch the amp out of standby and allow a few seconds for the circuit to stabilize.
6. Set the voltmeter to millivolt scale (or lowest volt scale 60 millivolts =.060 volts.)
7. Observe the display on the meter to see the current bias setting.
A setting of 0.120 to 0.124 volts is normal for 100 watt amplifiers with (4) 6L6’s.
A setting of 0.060 to 0.063 volts is normal for 50 watt amplifiers with (2) 6L6’s.
A setting of 0.090 to 0.100 volts is normal for 40 watt amplifiers with (4) 6V6’s.
If an adjustment is needed, use a small flat blade screwdriver inserted into the bias adjust pot
and adjust by turning the bias screw SLOWLY in very small increments until the desired setting
is achieved on the meter. Then wait a few moments for the bias to stabilize and re-adjust if
necessary. You may need to repeat this procedure a couple of times.
*Bias ranges are measured and set in volts
*Do not set bias higher than recommended levels as it can lead to tube failure and possible damage to other components
in the amplifier!