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RedPlate BlackVerb Standard Operations Guide
Rear Panel Export:
IEC Module – contains the main power switch, power cord inlet connector and the fuse drawer
which doubles as the voltage selector on export models. To access the fuse(s) use a small flat
blade screwdriver in the notch at the bottom of the power cord inlet connector, the drawer snaps
out in a rearward direction. The BlackVerb can accept both the larger (3AG footprint) or smaller
European (5mm X 20mm) fuses. A time delay variety (SLO-BLO) is recommended. A fuse in the
range of 2.5 to 3 Amps is fine for domestic use (110 – 125 VAC) and 1.25 to 1.5 amps is fine for
Export use (220 – 240 VAC). The fuse drawer can be rotated on the export models for voltage
selection, make sure the correct value fuse is located on the same side of the fuse drawer as the
desired selection arrow. Line up the appropriate arrow on the fuse drawer with the arrow on the
bottom right of the module for the proper VAC selection.
50 WATT / 40 WATT Switch – This switch changes the bias architecture of the output tubes
from fixed bias (50 WATT) to cathode biased (40 WATT).
The 40 WATT position allows the use of 6V6 tubes for lower power output (~18 Watts with
6V6).
HI/LO POWER Switch – Changes the voltage on the power amp input stage (Phase Inverter
tube) so the amplifier breaks up sooner. Newer versions may have a PENTODE/TRIODE Switch.
Bias adjustment and bias test point – Allows external access for bias adjustment (see bias
procedure in the Maintenance section).
Impedance Selector Ω - Set this to the total impedance of all attached speakers. When 6V6
tubes are used, set to the next lower number.
Speaker Jacks – The MAIN and EXT jacks are wired in parallel. The MAIN jack must be used
first because it has a protection device. ALWAYS HAVE A SPEAKER CONNECTED TO AVOID
PERMANENT AMPLIFIER AND OUTPUT TUBE DAMAGE.
LINE OUT – A line level signal jack derived from the speaker output which contains the whole
tone of the amplifier.
SEND and RETURN Jacks – The send jack connects to the input of an external effects device
and the return jack connects to the output of an external effects device. The return jack interrupts
the signal path so the external effects unit must mix the wet and dry signals.
Footswitch Jack - This is a standard 180 degree 5 pin DIN jack for footswitch connection. If a
replacement cable is needed, make sure all 5 wires are supported. The pinout is conveniently
located on the rear panel for use with automated switcher conversion boxes.
SMOOTH Switch – Employs local negative feedback in the clean preamp for a hint of
compression.
Humbucker / Single coil Switch – Sets the amount of bass gain in the input stage, useful for
matching the amplifier to the guitar type.
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