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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 V4 Amplifiers with matched KT88 output tubes but the V4 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
extra fuses and an extra output tube on hand.
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.
Recommended bias is 40 ma and maximum bias for each tube type is as follows:
EL34 40ma
KT77 40ma
6L6 45ma
6550 50ma
KT88 55ma
Bias controls are behind each tube. To check the bias push in the button for the tube you want to
check and note the reading on the meter. Each tube corresponds to the black button nearest it. The
amp may sound a little better with higher than 40 ma bias on some speakers and lower than 40 ma
bias on others.
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 four output tubes. Actual bias is
shown on the bias meter. The V4 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 buttons 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.
WARNING
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 off and then on within a short period of time
(45 seconds.)