Owner`s manual

Figure 2. Removable hatchplate

1) Allow the amplifier to warm up for at least 30 minutes.

2) Turn the preamplifier off so that no signal is entering the amplifier

3) Loosen the 4 captive screws on the top hatch cover.

4) Remove the hatch cover. The bias tool is snap attached to the inside of the

cover.

5) Locate the toggle switches and associated small potentiometers (they are blue

and have a small screw in the top). There is a set of six for each of the left and

right channels. Note the biasing meter for each channel

6) Make sure that all of the toggle switches are pointed towards the rear of the

amplifier. Begin with either channel and starting from the left, flip the first

toggle switch towards the front of the amplifier. You will see that the meter

will rise up to show that the tube’s current is now flowing through the meter.

7) Using the bias tool, slowly turn the screw on the potentiometer that is adjacent

to the switch until the bias meter reads 40 miliamps (mA). Turn the screw

clockwise to lower the bias and counterclockwise to raise the bias. Note that

there are two ends on the bias tool. Using the end with the recessed

screwdriver will greatly facilitate this operation.

PDF Created with deskPDF PDF Writer - Trial :: http://www.docudesk.com