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RedPlate BlackLine/BluesLine Operations Guide
fuse is the MAINS fuse, observe back panel recommended fuse value. On domestic models the left
side fuse area can be used to store a spare fuse. On dual voltage models the fuse drawer is
rotated 180 degrees to select the new voltage and fuse.
Standby/Operate 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 / 18 WATT Switch – This switch does not really change the power output of the
amplifier but makes the amp break up much sooner in 18 watt position.
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.
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.
MID BOOST Switch – BlackLine only. This switch lets you select a midboost which increases
upper mids on both the clean and lead channels. Makes the clean preamp more "midrangey" and
adds "creaminess" to the lead channel. Switch must be activated for footswitch button to work.
TWEED MID Switch – BluesLine only. This switch lets you select a midboost on the lead
channel which increases upper mids and also sets the clean (Tweed) channel to the tweed
position(s) of the Mode switch. Makes the Tweed preamp "fatter" and adds "creaminess" to the lead
channel. Switch must be activated for footswitch button to work.
Boost Control – Sets the level of boost for the lead preamp, also activates a non adjustable
boost on the clean channel (or Tweed channel on the BluesLine). Control must be above zero for
footswitch button to work.
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.
Voicing - Humbucker / Single coil/ Fat Switches – Sets the amount of bass gain in the input
stage (separate switches for both Clean and Lead channels), useful for matching the amplifier to
the guitar type.
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