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Figure 2. Removable hatchplate
1) Allow the amplifier to warm up for at least 15 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). Note the biasing meter.
Figure 3. Bias switches and Potentiometers