Revv Owner’s Manual - 26
Power Tube Sockets & Tube Type
This amp has been designed to allow mixing of power tubes as each pair
has its own bias adjustment.
Tube positions 1 & 3 are set up as one pair & are biased with the bias
adjustment trimmer next to tube 1. Tubes 2 & 4 are the second set that
are biased with the adjustment trimmer next to tube 2.
This allows you to mix different power tubes in the amp if you wish to
experiment with new sounds. i.e. a set of KT88 tubes can be used with a
set of EL34 tubes.
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 V4 &
V6. A 12AT7 preamp tube is used in the V5 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).
5.2
5.3
5.4