Front Panel
The Presence A/B switching function can be executed via a Looper
or other MIDI devices that feature a freely-programmable switching
input. If the ground and the circuit are identical in the MIDI device
then you may encounter ground hum.
A practical application of the PRESENCE switching feature in
conjunction with a dual channel preamp (clean/lead): PRESENCE A
controls set between the 1 and 4 o'clock positions; PRESENCE B
controls set between the 8 and 11 o'clock positions. Activate
PRESENCE A in the clean mode and PRESENCE B for the lead mode.
You can also access two different tonal variations in each of the
operating modes (i.e. clean & lead) using the PRESENCE function as
described in this example.
This amp is designed for one speaker cabinet per channel. If you
decide to connect additional speakers, ensure you keep the overall
impedance in mind! For instance, if you want to connect two 8Z
systems per side, you must first connect them in series and then to
the amp's 16Z outputs. The -Speaker Cabinet Extension offers
a number of options, right up to four cabinets per channel.
If you are using a stereo speaker for both channels, ensure it actually
operates in the stereo mode, otherwise you may damage the power
amp. A convincing stereo image is achieved via a quality stereo
effects processor and a separate speaker for each channel.
The 830.30 model is perfectly suited for studio-recording or club
gigs. Additionally it offers the advantage to reach tube poweramp
distortion at a moderate volume with authentic sounds.
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3
T I P
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Presence A/B
Switching from PRESENCE A to
PRESENCE B
1.Position Off:
PRESENCE A active
2.Position On (pushed in):
PRESENCE B active
red LED indicates PRESENCE B active.
PRESENCE A/B switching can be executed
via footswitch;
the PRESENCE A/B switch is then inactive
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1
2
3
4
5
6 7
8
9 10 11 12
13
14
Gain(Lo/Hi)
power amps’ input sensitivity
Presence B Left
treble control B in the power amp, left channel
Presence A Right
treble control A in the power amp, right channel
Presence B Right
treble control B in the power amp, right channel
Power Tube Fuse
power tube fuse (ECS) for tube
pair V6 und V7 (830.50)
LED indicates defective fuse
In model 830.30:
tube pair V4 und V6
Power
AC power on/off
Presence A Left
treble control A in the power amp, left channel
Standby Right
right channel standby
Standby Left
left channel standby
Power Tube Fuse
power tube fuse (ECS) for
tube pair V10 und V11 (830.50)
LED indicates defective fuse
Power Tube Fuse
power tube fuse (ECS) for tube
pair V8 und V9 (830.50)
LED indicates defective fuse
In model 830.30:
tube pair V9 und V11
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Volume Right
volume control for the right power amp
Volume Left
volume control for the left power amp
15
Power Tube Fuse
power tube fuse (ECS) for tube
pair V4 und V5 (830.50)
LED indicates defective fuse
