Revv Owner’s Manual - 20
Tubes & Bias
Power Tubes
Our lower wattage amplifiers are designed with 6V6 tubes for the best
tonal & feel performance at a wide range of volumes. REVV-brand 6V6GT
tubes are always recommended when replacement is required.
Note: While we designed the amplifier to be easy to maintain, we advise
that all tubes be set up by a qualified service technician to prevent
damage to the amp from improper bias settings.
Preamp Tubes
This amplifier uses 12AX7 preamp tubes in tube positions V1 V2 V3, & V5.
A 12AT7 preamp tube is used in the V4 position for the FX Loop & only a
12AT7 tube should be used in this socket.
Preamp tubes do not need to be biased & usually have a long life unlike
power tubes, but 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 taking the chassis out of the
wood head shell. You will need a voltmeter or digital multimeter set to the
lowest DC voltage range. (Make sure you refer to the meter’s user
manual).
Note: Use tubes that are matched! A matched quad is best but matched
pairs will also suffice.
5.0
5.1
5.2
5.3
