User Manual

Front
1
Gain
Power amps' input sensitivity. This button
increases the gain level for both channels
at the INPUT jacks (24) and (25).
2
VOLUME LEFT A
volume control A for the left power amp.
This control is active if button A/B is in the
off position; LED does not illuminate.
3
VOLUME LEFT B
volume control B for the left power amp.
This control is active if button A/B is in the
on position (depressed); LED illuminates.
7
PRESENCE LEFT A
Treble control A for the left poweramp
channel; it is active if button A/B (9) is in the
off position; LED is not illuminating.
T I P 2
8
PRESENCE LEFT B
Treble control B for the left poweramp
channel; it is active if button A/B (9) is in the
on position; LED is illuminating.
T I P 2
STANDBY LEFT
left channel standby.
12
STANDBY RIGHT
right channel standby.
13
POWER
AC power on/off.
14
GAIN
TUBE POWERAMP 840/50
PRESENCE
A / B
L EFT A L EFT B R IGHT A R IGHT B
STAND B Y POWER
R IGHT L EFT
R
VOLUME
A / B
L EFT A L EFT B R IGHT A R IGHT B
1
2 3 4 5 6 8 9 10 11 12 13 147
T I P 1
T I P 1
4
A/B VOLUME
switches between VOLUME A controls and
VOLUME B controls.
1. A/B button position off: VOLUME A
2. A/B button position on: VOLUME B,
indicated by the red LED.
This feature can also be switched via a
footswitch connected to jack 23;
the VOLUME A/B pushbutton is
deactivated once a footswitch is connected.
T I P 3
9
A/B PRESENCE
switches between PRESENCE A controls and
PRESENCE B controls.
1. A/B button position off: PRESENCE A
2. A/B button position on: PRESENCE B,
indicated by the red LED.
This feature can also be switched via a
footswitch connected to jack 23;
the PRESENCE A/B pushbutton is
deactivated once a footswitch is connected.
T I P 3
10
PRESENCE RIGHT A
Treble control A for the right poweramp
channel; it is active if button A/B (9) is in the
off position; LED is not illuminating.
T I P 2
11
PRESENCE RIGHT B
Treble control B for the right poweramp
channel; it is active if button A/B (9) is in the
on position; LED is illuminating.
T I P 2
T I P 5
T I P 5
5
VOLUME RIGHT A
volume control A for the right power amp.
This control is active if button A/B is in the
off position; LED is not illuminating.
6
VOLUME RIGHT B
volume control B for the right power amp.
This control is active if button A/B is in the
on position (depressed); LED is illuminating.
T I P 1
T I P 1