User Guide
1
PM-200 POWER SUPPLY MODULE INSTALLATION INSTRUCTIONS
PARTS SUPPLIED WITH THIS KIT:
(1) PM-200 Power Supply Module Circuit Board
(1) 15KΩ ½W 1% Resistor
To start the installation, read these instructions very carefully. Unplug the amplifier and
remove any input, output and control cables that may be connected to the back of the amplifier.
Remove the chassis from the case and remove the perforated sheet metal RF shield from the top
of the chassis. Remove the tubes and place them in a safe place. You are now ready to proceed
with the installation.
( ) Place the amplifier on its side (transformer down). Unsolder all wires connected to the
power supply circuit board. These are the RED and RED & YELLOW transformer wires on
the top side of the circuit board, a GRAY wire and a YELLOW wire from the top side of the
board (these wires pass through the hole in the circuit board), the (3) 4.7MΩ resistor
assembly on the bottom of the circuit board and the heavy BLUE HV wire on the bottom
side of the board.
( ) Remove the fixed end of the (3) 4.7MΩ resistor assembly from the terminal strip lug and
discard these resistors.
( ) Remove the (9) 6-32 x 3/8” screws, washers and nuts that secure the circuit board in place.
Save this hardware.
( ) Place the amplifier right side up and remove the 5 control knobs from their shafts.
( ) Remove the 3 nuts and washers that secure the bandswitch, meter switch and sensitivity
potentiometer and save them.
( ) Remove the (4) 6-32 x 3/8” Phillips-head screws, washers and nuts that secure the front
panel. Save this hardware.
( ) Gently tilt the front panel forward. You may have to carefully pry it loose with a small
screwdriver because of paint stickage. Place the front panel down in front of the chassis.
( ) Lift the circuit board from the front so that it tilts upward about 1”.
( ) Using diagonal cutters, cut the old circuit board from the front left corner all the way back to
the wire hole. This will break out a path for the wires to exit. Be careful not to cut any wires
during this process. This will free the old circuit board so that is can be removed without
further unsoldering of wires.
( ) Carefully work the old circuit board out of the compartment and discard it.
( ) Take the new circuit board and work it into position with the wires passing through the slot
in the board.
( ) Secure the board on the right side with 2 or 3 of the 6-32 x 3/8” screws, washers and nuts.
Tighten enough to hold the board. They will be adjusted later.