RedPlate RPHD100 Operations Guide
4
REAR PANEL SECTION
IEC Module
– contains the main power switch, power cord inlet connector and the fuse drawer. To access the fuse 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 RPHD100
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.
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).
100 WATT / 50 WATT Switch
– This switch lifts the center two output tubes (V7 & V8) to effectively remove them from having any
audio impact. The impedance of the amplifier remains unchanged.
Bias adjustment and bias test point
– Allows external access for bias adjustment (see bias procedure in the
Maintenance
section).
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.
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.
Impedance Selector Ω
- Set this to the total impedance of all attached speakers.
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.
Trigger Control
– This control sets the amount of signal for the first gain stage of the section. Low settings are smoother and higher
settings are more aggressive.
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.
Overdrive Switch
– UP = Overdrive on when the footswitch is not connected. Make sure switch is down for footswitch usage.
Boost Switch
– UP = Preamp boost on when the footswitch is not connected. Make sure switch is down for footswitch usage.