User Guide

2
( ) Reinstall the YELLOW and GRAY wires in their marked holes in the circuit board and
solder.
( ) Swing the front panel back into position and reinstall the (4) 6-32 x 3/8” Phillips-head
screws, washers and nuts.
( ) Reinstall the 3 control flat washers and nuts and tighten.
( ) With the amplifier on its side (transformer down), install the remaining 6-32 x 3/8” screws,
washers and nuts holding the circuit board in place. Tighten all screws. You will have one
screw left over.
( ) Put the RED and RED & YELLOW transformer wires through their appropriate holes in the
circuit board and solder.
( ) Place the amplifier upside down.
( ) Locate the 2-lug terminal strip just to the rear of the new circuit board. Remove the 15KΩ
resistor and clean the holes in the terminal strip lugs. Note: There is still a blue wire
connected to the insulated terminal lug.
( ) Connect the small BLUE wire connected to hole A on the circuit board to the insulated lug
of the terminal strip. DO NOT solder yet.
( ) Connect the supplied 15KΩ ½W 1% resistor between the 2 lugs of the terminal strip.
Solder all connections (See pictorial).
( ) Solder the heavy BLUE HV wire to the circle pad marked “H” on the circuit board.
( ) Carefully inspect all work. Replace the front panel knobs (make sure they are properly
aligned with the front panel markings).
( ) If you are also installing the SS-200 “Soft Start” module, you can proceed to those
instructions. If not, continue with these instructions.
( ) Reinstall the tubes and the perforated sheet metal RF shield on the top of the chassis and
put the chassis back into the case.
This completes the installation of the PM-200 power supply module. It will provide you with
a better power supply that provides the necessary B+ filtering and regulation. Your amplifier
should not experience any power supply problems in the future.
HARBACH ELECTRONICS
Jeff Weinberg – W8CQ
468 County Road 620
Polk, OH 44866-9711
[phone]
http://www.harbachelectronics.com
[e-mail]