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REAR PANEL
Footswitch socket
TREMOLO/REVERB. Connect the supplied dual latching footswitch here to select
TREMOLO On/Off and REVERB On/Off.
Effects Loop
The V40D has an effects loop, which is a simple, low impedance, series loop.
The By-Pass switch completely disables the Effects loop for ‘True-Bypass’ Please ensure
this switch is in the up, ‘ON’ position if you want to use effects in the Loop.
The RETURN socket is for connection to the output of effects units. When not used it is
internally connected to the SEND, therefore the EFFECTS LOOP can be ignored if not in
use. It can also be used as a small signal ‘Slave’ input from another amplifier but DO NOT
plug an amplifier’s speaker output into the Return socket or very bad things will happen.
The RETURN socket is also very useful for fault diagnosis. If your V40D doesn’t produce
any sound when played, plug the guitar directly into the RETURN socket and play. This
bypasses the entire pre-amplifier section and sends the guitar signal through just the
output stage. If sound is now heard then the problem is in the pre-amp section and is
likely to be a faulty pre-amp valve.
The SEND socket is for connection to the input of effects units. On the V40D it is a lower
impedance version of the signal that appears at the INPUT. Use the send to connect to
floor pedals or rack effects such as Delay, Chorus and Reverb etc. Effects such as
Overdrive, Fuzz, Wah Wah and Tuners often give better results plugged into the
Instrument Input on the front panel. The Send socket can also be used on its own to send
a signal to another amplifier.
Biasing:
Biasing needs to be done each time the output valves are replaced and should be checked
periodically to make sure they are working at their optimum for sound quality & valve
life. To set the Bias on the V40D you need a multimeter set to the 200mV DC range.
Biasing is carried out externally so no need to remove the amp from the wooden sleeve.
Output valves can be replaced from the rear of the amp by simply removing the back grill
