RedPlate RP50DUO Operations Guide
5
REAR PANEL SECTION
Domestic (USA):
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 RP50D 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.
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).
FIXED/CATHODE (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).
Bias adjustment and bias test point
– Allows external access for bias adjustment (see bias procedure in the
Maintenance
section).