12
Rear Panel Tuner Send
Instrument Level
Front Panel Input
-10 dB
pad
switch
logic
Mute Switch
-10 dB Pad
In/Out
Mute LED
buffer
buffer
Preamp
Gain
low cut
high
boost
12AX7
12AX7
buffer
3-band parametric EQ
+/- 15 dB +/- 15 dB +/- 15 dB
low
high
+/- 15 dB
contour
EQ clip Detect
bufferhi-pass
cut/boost
Preamp signal present
frequency
frequency
frequency
bandwidth
Wet/Dry Control
Effects Loop
Side Chain
effects return effects send
footswitch
switch
logic
Balanced Line Out
Pre/Post
EQ Select
buffer
line out level
line drivers
ground lift
Minimum Load is 2 ohms
status LED
Green = Pwr On
Red = DDT/Clip
power amp buffer/DDT
500 Watts RMS
with 2 ohm load
350 Watts RMS
with 4 ohm load
Speakon
line level
1 VRMS 0 dB
speaker jacks
power amp in preamp out
buffer
Volume
1
2
3
2(+)
1(-)
2(-)
1(+)
Rear Panel Input
Post Gain
bandwidth
bandwidth
low/mid mid high mid
Infrasonic filter
ring
tip
post EQ
pre EQ
200 Watts RMS
with 8 ohm load
Effects Loop
0 db
1 VRMS
ProBass 500 Block Diagram