RedPlate Black-n-Blues Operations Guide
8
MAINTENANCE SECTION
Your Black-n-Blues 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, also a great cable cleaner.
TUBE CHART 45 Watt
TUBE CHART 100 Watt
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 - 45 Watt Model w/ 4 6V6 tubes
1. When new 6V6 GT output tubes are installed it is important to re-bias the amp for optimal
performance.
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 set to zero.
5. Set the 45 WATT/ 18 WATT switch to the 45 WATT position.
6. 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.
