Revv Owner’s Manual - 15
Tubes & Bias
Power Tubes
- The Revv D20 has been designed to use
6V6GT
power
tubes in the power section, and it is recommended that Revv 6V6GT
power tubes be used whenever replacement is necessary for optimal per-
formance.
Preamp Tubes
- The D20 amplifier uses
12AX7
preamp tubes in tube
positions
V1
and
V2
positions. Preamp tubes do not need to be biased
and usually have a long life, unlike power tubes. However it is possible for a
preamp tube to become faulty at any stage of its rated lifespan.
Power Tube Bias
- The power tubes can be biased without opening the
chassis. You will need a digital multimeter set to the lowest DC voltage
range. (Make sure you refer to the meter’s user manual and are familiar
with the meter - not all meters are capable of reading such a small signal.)
Note: Use tubes that are matched! It is recommended that a matched
Revv brand pair of 6V6GT tubes be used when replacing the power
tubes.
Note: While the bias setting of the power tubes has been made user
friendly, we do not expect everyone to be experienced enough to per-
form the procedure and we strongly recommend that the procedure be
completed by an experienced technician to prevent damage to the ampli-
fier or power tubes.
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