TUBES
The input tubes in this amplifier were chosen for their specific performance characteristics. These
tubes should last between one and two thousand hours. We can only guarantee the performance
of this unit when used with input tubes supplied by Quicksilver.
Quicksilver ships the Mono 100 Amplifiers with matched KT88 output tubes but the Mono100 can
use KT90s as well. The output tubes should be matched.
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.
The meter included should be set on the 200 m DCV scale
With the meter set on this scale and the meter wires plugged into the bias meter jacks, the meter
will read millivolts. Recommended bias is 80 millivolts and the maximum bias for each tube type
is as follows:
KT88
100 millivolts
KT90
120 millivolts
The bias control is between the output tubes near the power transformer.
To adjust the bias you will need a slot-head screwdriver. Adjust by turning clockwise to increase
bias; counterclockwise to decrease bias.
Remember that bias set above the recommended values
will wear out your tubes prematurely.
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.)
