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Channel 1
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Channel 1 is the lead/overdrive channel and is
selected in one of two ways, via the Channel Select
switch on the control panel, or via the Channel Select
button on the supplied footswitch* pedal. A Yellow
LED located next to the Channel 1 Volume control
illuminates when Channel 1 is active.
*Note: Plugging in the footswitch deactivates the panel-
mounted Channel and Boost controls.
Gain & Volume Controls
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Channel 1 uses a Gain control in conjunction with a
Volume control to control the amount of tube-based
overdrive and volume. The Gain control is used to adjust
the amount of overdrive, while the Volume control allows
you to set the actual loudness of the amplifier.
Boost Switch
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A boost circuit is included to help you achieve ‘a-bit-
more’ overdrive for leads. The boost can be selected
via the front panel switch or through the supplied
footswitch pedal. A Red LED illuminates to indicate
when the boost is active.
Channel 1 Tone Controls
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The Treble, Bass, and Middle tone controls are
used to help you shape your sound. They are post-
gain and pre-volume. These are active only when
Channel 1 is selected.
Channel 2
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Channel 2 is the clean channel and thus has no Gain
control. In other respects the layout is the same as that
of Channel 1, with independent Volume and Treble,
Bass, and Middle tone controls. When channel 2 is
active the green LED located next to the Channel 2
Volume control is illuminated.
Brightness Switch
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Channel 2 includes a Brightness switch that activates
a circuit to provide additional treble boost to help make
your tone sparkle.
Master Controls
Presence Control
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The rotary Presence control is part of the Master
Control and adjusts the amount of edge or presence
(upper midrange) on your overall sound.
Reverb Control
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The Master Control section also includes a rotary
Reverb control that adjusts the overall reverb level
for both channels. The YCV40/YCV40T is equipped
with a long-style Accutronics® dual-spring reverb for
authentic vintage reverb.
Standby Switch & Indicator
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This switch controls the high voltage power being
supplied to the tubes. This mode effectively keeps the
tubes warmed up when the amp is not in use. The large,
jewel indicator on the front panel glows Red when the
amp is fully powered-up and changes to Yellow when the
high voltage circuit has been turned off. Putting the amp
into Standby mode (i.e. during set breaks) shuts off the
amplifier output stage and effectively increases tube life
by reducing wear on the tubes.
EFX / LINE Send & Return Jacks
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The Send and Rtn jacks of the YCV40/YCV40T allow
convenient use of an external effect unit. Simply connect
a 1/4 inch phone cable to the Send jack of the YCV40/
YCV40T and then connect this cable to the Input of your
effects unit. To send the processed signal back to the
YCV40, connect the output of the effects unit to the Rtn
jack of the YCV40/YCV40T.
The 1/4 inch TRS Send jack can be used as part of
an effects loop in conjunction with the Rtn jack. It can
also be used as a direct line out (preamp-out). The
-10dBu output is ideal for most guitar effects pedals
and professional signal processors. You can also use
this output to slave the YCV40/YCV40T with another
guitar amplifier by plugging into the Rtn jack of the
slave amplifier.
The 1/4 inch TRS Rtn jack can be used as your return
jack for your effects loop. It accepts an input signal that
is passed to the power amplifier, so it can be used as a
power amp in. The Master Control section regulates the
signal, so you can add Reverb as well as Presence.
Footswitch Jack
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Connecting a footswitch to the 1/4 inch TRS Footswitch
jack deactivates the control panel mounted Channel
Select and Boost switches. These functions are then
activated exclusively by the pedal. The included
footswitch features dual-latching switches, each with a
separate LED indicator.
The switching is accomplished with internal relays
so there is no audiable noise flowing through the
footswitch cable. Footswitch-induced noise is never an
issue. The YCV40/YCV40T is compatible with most
aftermarket latching dual-footswitch pedals.
External Speaker Jack/s
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These under-the-chassis mounted 1/4 inch jacks
allow convenient connection of an 8-ohm external
speaker cabinet. If you disconnect the internal 12
inch Celestion® speaker (2x10 inch on YCV40T),
you can connect up to two 8-ohm external cabinets.