RedPlate TruVerb Standard Operations Guide
4
4. POWER OFF
– Toggle the main power switch downward, there is no need to go into
standby first although it will not hurt anything.
MAINTENANCE SECTION
Your TruVerb amp has been designed for years of trouble free operation. The vacuum tubes
will need to be replaced over time. We recommend new output tubes every 160 - 240 hours and
new preamp tubes every 320 - 480 hours.
The front and rear panels have a protective finish that can be easily scratched with abrasives
so always use a damp soft cloth to clean them (never use paper towels). The cabinetry can be
cleaned with our super secret tolex cleaner (on a paper towel - 2 squirts of WD-40 and 4 squirts
window cleaner), let your keyboard player try it on his plastic keys, it replicates the feel of a brand
new keyboard.
TUBE LAYOUT
All tube brands are acceptable, a long plate is preferred in the V5 (Phase Inverter) position.
Warning
– No user serviceable parts inside so unless you know what you’re
doing please refer to a qualified service person only.
BIAS PROCEDURE
See Addendum for TruVerb88 bias procedure
1. When new 6L6 GC output tubes are installed it is important to re-bias the amp for optimal
performance. No biasing needed for 6V6 tubes because they can only be used in cathode
bias position.
2. ALWAYS HAVE A SPEAKER CONNECTED.
3. Use a digital volt meter set to DC volts at lowest scale (MV). Makes sure the black lead is
the common terminal of the meter and the read lead is the DC voltage terminal of the
meter.
4. Place the Amplifier in operate mode with the Master Volume and Reverb controls set to
zero.
5. Place the red meter lead in the test point hole (red tip jack) And touch (or clip) the black
meter lead on one of the metal output tube retainer clips.
6. Use a small flat blade screwdriver to adjust the bias pot for a reading of 140MV ± 5 MV (FYI
- the plate voltage is 470 volts). The reading is the sum of the idle current for all four 6L6
tubes.
7. Recheck the reading after 10 minutes of operation, and again after a week or two of
operation.