User Manual

6
SVT-CL Bass Guitar Amplifier
TUBE BIAS DIAGNOSIS
Condition Problem Solution
Green comes on, turns red No problem The longer the green LED
is lit prior to the red LED
illuminating, the better
matched the set of tubes
Red comes on, then green Tubes not properly
matched
Set slightly prior to when
the green LED illuminates.
Obtain a matched tube set
when possible
Red comes on, no green One or more tubes are non-
functional
Check to make sure tubes
are all seated properly; if
so, nd and replace bad
tube(s)
None on Possibly no high voltage,
bad Bias Control, or bad
tube(s)
Have unit checked by a
service technician
Both on all the time Possible bad Bias Control
or bad tube(s)
Have unit checked by a
service technician
If the tubes are bad enough to cause damage to the unit, the Fault Indicator (see #11 -
"The Front Panel" on page 3) will signal and the unit will shut down.
Block Diagram
BIAS
ADJUST
SPEAKER
OUTS
0dB INPUT
GAIN
ULTRA
LO
MID
FREQUENCY
MASTER
BUFFER
PREAMP
OUT
PWR AMP
INPUT
SLAVE
OUT
BAL
OUT
1/4" JACK
1/4" JACK
POWER
AMP
POWER
STANDBY
FAULT
BIAS
INDICATORS
ULTRA
HI
-15dB INPUT
BASS TREBLE
4 OHMS
2 OHMS
IMPEDANCE
POWER AMP
PROTECTION
SPEAKON
®
JACK
1+
2+
1- 2-