Two-Rock Silver Sterling Signature, Owner'S Manual

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FUSE CHART
All Fuses are 3AG Type 250 Volt, SLO-BLO
Export 100 Volt Domestic Fuses: Export 220, 230, 240
Fuses:
3.2 - 100 Watt 4x6L6 3.2 - 100 Watt 4x6L6 2.5 - 100 Watt 4x6L6
4 - 150 Watt 4x6550 4 - 150 Watt 4x6550 2.5 - 150 Watt 4x6550
FOOTSWITCH
FET - Blue LED
BYPASS - Red LED
TUBE COMPLIMENT
V1- Preamp 12AX7
V2- Reverb Drive 12AT7
V3- Reverb Mix 12AX7
V4- Reverb Return, Reverb Send Gain 12AX7
V5- Phase Inverter 12AX7
V6- Cathode follower 12AX7WA
(Use proper
cathode follower tube. See Two-Rock for
recommendation)
V7-V10 - 6L6WGC, Output (100 Watt) ; 6550, Output (150 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 ADJUSTMENTS:
1. Power up unit and connect proper speaker load.
2. Set master volumes and effects return controls to zero.
3.
DO NOT apply any signal to the input during the biasing procedure!
4. Take unit off standby and allow a few seconds for the circuit to stabilize.
5. Set voltmeter to Millivolt scale (or lowest volt scale 60 millivolts=.060 volts.)
6. With meter grounded to chassis and + probe at test point, measure voltage. A reading of
0.030 to 0.032 volts is normal for 100 Watt amplifiers with (4) 6L6’s.
7. A reading of 0.034 to 0.036 volts is normal for 150 Watt amplifiers with (4) 6550’s.
8. If not in this range, adjust by turning bias screw SLOWLY a small amount.
Do not set
above .035!
Settings higher than recommended may cause premature tube wear and possibly damage the amplifier.
Keep in mind that tubes vary in quality, and some tubes can handle varying mA. If you’re not sure, ask a technician or contact
Two-Rock.
WARNING!
No user serviceable parts inside! Refer to qualified service person only.