Quicksilver M135 - Manual (Page 2)

4 AMP SLO-BLO FUSE
Standard fuse value must not be exceeded. If a fuse blows, replace and check output tube bias.
If there is a large change in any tube, then that tube is probably damaged. If the bias has not
changed then the cause of the fuse blowing may be due to other problems, such as 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.
Quicksilver ships the M135 Amplifiers with matched EL34 output tubes but the M135 can use a
variety of output tubes. The output tubes do not need to be matched however matched tubes can
provide better performance.
Output tubes will need to be replaced periodically. When a degradation in sound occurs, the fuse
blows repeatedly or the tubes will not hold their bias anymore 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 SETTING
Output tube bias should be set immediately when new tubes are put in; then again in 15 minutes;
and periodically the first few times of using the amplifiers. After that the bias should be checked
monthly.
The bias must be set correctly for the type of output tube that is used. The maximum setting for each
tube is as follows:
EL34 45ma
KT77 50ma
6L6 50ma
6550 60ma
KT88 60ma
Bias controls are behind the door near the right front panel handle. Open the door by applying
pressure with a finger at the bottom right. To check the bias push in the control for the tube you
want to check. Each tube corresponds to the control nearest it.
To adjust the bias you will need a slot-head screwdriver. Adjust by turning clockwise to increase
bias; counterclockwise to decrease bias. Do this for each of the six output tubes. Actual bias is
shown on the front panel bias meter. The M135 can use a variety of output tubes. Remember that
bias set above the recommended values will wear out your tubes prematurely.
If you depress two or more jacks at the same time the meter averages the readings of the tubes,
so your meter will not be damaged. Tube biases should be checked individually.