User Guide

3
( ) Reinstall the lamp assembly into the meter not being replaced.
( ) Bring the front panel up to the chassis. Put the tuning capacitor, loading capacitor and
bandswitch shafts through their respective holes. Hold the front panel in place with the
bandswitch mounting washer and nut (loosely installed).
( ) Replace the (4) 6-32 Phillips-head screws at each corner of the front panel. Secure with a
lock washer and nut and tighten firmly.
( ) Tighten the nuts holding the bandswitch, meter switch and sensitivity potentiometer.
( ) Place the loading capacitor and tuning capacitor in their fully meshed position. Turn the
other 3 shafts to their full counterclockwise position. Now reinstall the 3 large and 2 small
knobs. The tuning and loading capacitors each point directly to the left (9 o’clock). The
bandswitch knob points at 80. The sensitivity potentiometer points at 7 o’clock and the
meter switch knob points to “GRID”.
( ) Replace the perforated cover and top rear plate cover. Reinstall the 15 sheet metal screws
holding these pieces in place. DO NOT over tighten these screws, as it is fairly easy to
strip the screw threads in the aluminum underneath.
( ) Reinstall the case and feet using a book to support the amplifier.
This completes the replacement of a panel meter on your SB-220. You will notice small
differences in the action of these meters as the ballistics are different from the original Heathkit
meters. They are as accurate, however.
HARBACH ELECTRONICS
Jeff Weinberg – W8CQ
468 County Road 620
Polk, OH 44866-9711
[phone]
http://www.harbachelectronics.com
[e-mail]