2.3
Tubes
Each Supro tube amplifier is a 100% analog, 100% tube amplifier. There are NO
solid state (transistor) devices in
ANY
audio signal path.
Viewed from the rear of the chassis
Power
Transformer
Output
Transformer
Power Tubes
6L6
6L6
ECC83
ECC83
ECC83
ECC832
ECC83
V1
V3
V4
V5
V6
V7
V8
CH1 Preamp
CH2 Preamp
Reverb Make-up
EFX Loop
ECC81
V2
Reverb Driver
CH2 Preamp
Phase Inverter
2.4
Troubleshooting
Supro products have been designed for years of trouble free service. There are many
unique protection features to the design.
If you are having difficulty, check the
following:
No sound, but PILOT LIGHT is ON
Check to see that the speaker is plugged into the SPEAKER JACK (not the footswitch
jack). Make sure all knobs are turned up past zero and that the standby switch is set
to operate. As this is a tube amp, the tubes take approximately 1 minute to warm
up before you will get sound. The STANDBY switch should be set to standby for
this warm up period.
No sound and the Lights are All OFF
Unplug the power cord and check the 2.5A, 250V fuse (rear panel).
If you have any further questions, our email address is
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