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Back Panel (Power Tube Biasing):

FAN

CAUTION:

NEVER touch hot tubes!!! Temperatures can exceed 500˚F and cause severe burns!

Biasing your tube ampliﬁer need not be a scary endeavor as the process is pretty straightforward.

Heed all warnings, cautions and instructions and you should do ﬁne. If you're unsure or unclear on

the process, do not attempt to manipulate the bias from factory settings. If, during the biasing

process, you hear a loud "pop" or see a tube "ﬂash" immediately power down the unit and seek a

qualiﬁed tube ampliﬁer repair/service technician.

OPERATION NOTES:

• Monitor your output tube bias at idle current. To achieve idle current, your amp must be turned

on and operating at idle (no audio signal being fed into the input or the FX loop return). Make

sure that your speaker is plugged in.

• Attach the negative test lead from your multimeter to the GND- terminal (black) on the back

panel of the amp.

• One at a time, attach the red (positive) test lead from your multimeter to either V8+ or V9+ ter-

minals (red) and note the reading on your meter. Then read the voltage on the other tube. The

resulting numbers should be within 6mv of each other. Note that your maximum bias setting

must be based off of the higher number.

• To optimize your output tube bias, adjust the control screw by inserting a mini ﬂathead screw

driver into control port (see diagram and description for item number (28)). Turn clockwise to

bias your tubes 'hotter' (increasing the idle current) and counter-clockwise to bias your tubes

' c ooler' (decreasing the idle current).

• Cooler settings (lower idle current) can increase the life of your tubes. Too cool and the sound

will tend to be brash and one dimensional.

• Optimal tone and feel can be found when the bias range is around 50% - 70% of your tube's

maximum operating range. This will vary between the types of tubes you choose to operate your

amp with.

• Should you wish to swap to the other set of tubes, you must do so in like-kind pairs as mixed

tubes will not operate correctly and may be hazardous to your ampliﬁer. You can safely substi-

tute either rectiﬁer tube. Again, use caution to mount the correct tubes in the appropriate tube

sockets.

OHM SELECTOR

16Ω

8Ω

4Ω