Gibson GA-20 Owner's Manual page 19

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TURN IT UP
Gradually turn your volume up to a desirable level.
MORE TECHNICAL INFORMATION
CIRCUIT TOPOLOGY
GA20RVT: Class A 15W
GA40RVT & GA42RVT: Class A 30W
INPUTS
Channel1, Channel 2 & Mix
TUBES/VALVES
GA20RVT: 5X12AX7 (Preamp), 2X6L6 (Power)
GA40RVT & GA42RVT: 5X12AX7 (Preamp), 2X6V6 (Power)
FUSE
The line fuse, located in the line voltage module on the back of the amp, protects your
amplifier against irregularities in the A.C. source, tube failure, component failure, severe

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