2 AMP SLO-BLO FUSE
Standard fuse value must not be exceeded. If a fuse blows, replace and turn amp back on. Visually
inspect all 4 output tubes to see if they are all glowing at the same brightness. If one tube is not
glowing or is glowing red, that tube is bad. If the output tubes appear to be okay, then the cause
of the fuse blowing may be due to poor system grounding, unstable preamp, shorted speaker, etc.
Interchanging the amps between channels will help localize the problem to either the system or the
amplifier.
TUBES
The input tubes in this amplifier were chosen for their specific performance characteristics. These
tubes should last several years or many thousands of hours. We can only guarantee the
performance of this unit when used with input tubes supplied by Quicksilver.
Each M60 Amplifier is shipped with 4 matched EL34 output tubes. Best performance will result
when all 4 tubes are A.C. and D.C. matched. The number on each EL34 box is the D.C. matching
number for that tube.
Output tubes
will need to be replaced periodically. When a degradation in sound occurs or the
fuse blows repeatedly, it is time for new output tubes. We recommend purchasing tubes from
Quicksilver Audio or your dealer and we recommend keeping an extra output tube on hand in the
event that one fails.
OUTPUT TUBE BIAS
There are no bias adjustments in the M60. Whichever output tubes are used will all automatically
adjust themselves to the necessary bias. Because of this many different output tubes may be used.
The best performance and longest life will result when all 4 output tubes are matched.
Some of the output tubes that may be used in the M60 are: EL34, KT77, 6L6, 5881, 6550, KT88,
KT99A.
The measured performance and the sound of the amplifiers will be slightly different with each type
of output tubes used. In some cases the customer may want to change output tubes to finetune
the amplifier to his system.
8
2
AMP
FUSE
EL34
EL34
EL34
EL34
12AX7
12BH7
OR
12AU7
C
1
POWER
SWITCH
Push up
to turn on.
POWER SUPPLY
CAPACITORS
4
POWER
TRANSFORMER
IEC
OUTLET
SPEAKER
TERMINALS
INPUT
CONNECTOR
100K
OUTPUT
TRANSFORMER
