Quicksilver M60 User Manual
Quicksilver Audio M60 Mono Amplifier
Operating Instructions
Thank you for purchasing the Quicksilver Audio M60 Mono Amplifiers. The amplifiers have been engineered to have
a wide bandwidth, low distortion and excellent dynamic range.
Quicksilver believes simplicity provides the best sound and reliability. The AC signal in the M60 travels through only
one input tube, one driver tube, one coupling capacitor, the output tube and the output transformer. With only five
devices in the signal path, very little coloration is imparted to the signal.
This is an all tube design and uses no circuit boards or transistors.
This device has very high internal voltages. Never operate with the bottom removed!
Never operate your amplifers with the speakers disconnected.
To prolong the life of your amplifiers, never turn them on and off within a short period of time
(45 seconds.)
PLACEMENT
The M60 Mono Amplifiers should be placed where they will have plenty of air circulation. Allow
at least 6 inches of ventilation space on either side and at least 10 inches above them.
SPEAKER CONNECTION
Screw terminals are used for speaker connection because of their superior sonic performance.
The output transformer wires are silver soldered directly to the screw strips eliminating any output
wiring. Placing the amp directly behind the speaker with a very short speaker wire will further
improve the performance. The connection to the 4 or 8 ohm tap will be determined by the rating
on the back of your speaker system. The 1 ohm tap is for special applications only. The C terminal
should be connected to the common, ground, or negative terminal of your speaker.
C 1 4 8
SYSTEM GROUNDING
Input
100K
Your Mono Amplifiers come with three pronged grounded AC plugs. In some systems, where the
preamp is also grounded, a ground loop may appear as a low level hum. Using an adaptor on the
AC plug, to lift the ground, will solve this problem.
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.
POWER
TRANSFORMER
2
AMP
FUSE
IEC
OUTLET
SPEAKER
TERMINALS
TRANSFORMER
C
1
4
8
OUTPUT
EL34
INPUT
CONNECTOR
100K
12AU7
OR
12AX7
12BH7
EL34
EL34EL34
POWER SUPPLY
CAPACITORS
POWER
SWITCH
Push up
to turn on.
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