RedPlate BlackVerbDuo Operations Guide
4
producing increased low end at louder volumes. The control clicks off when rotated to zero for no
presence.
Master Volume
– This is an active control and actually adds gain at the higher settings. The
cleanest tones are achieved at settings below 7.
REAR PANEL SECTION
Domestic (USA):
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 BlackVerbDuo can accept both the larger (3AG footprint) or smaller
European (5mm X 20mm) fuses. A time delay variety (SLO-BLO) is recommended. Follow the
recommended amperage ratings on the panel. 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.
Standby Switch
– This switch allows the tubes to warm up before operating the amplifier. Wait
1 minute after power on to move it up to the operate position. For improved tube life and
performance do not leave the amplifier in Standby position for longer than 20 minutes (better to just
leave it in operate mode during performance intermissions).
50 WATT / 40 WATT Switch or Fixed/Cathode Switch
– (2 6L6 models) 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 less power output (~18 Watts with 6V6).
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 (50 Watt 2 6L6 models only).
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. Example usage would be for recording or connection to a PA or slave amp.