User Guide

2
( ) Carefully center punch the new upper right and lower left mounting holes.
( ) Drill these holes with a 1/16” drill, keeping the drill perpendicular to the panel (a drill press
helps, but is not necessary).
( ) Drill out the upper right hole with a 1/8” drill.
( ) If you have a 3/32” drill bit, use it to enlarge the lower left 1/16” hole, otherwise carefully
enlarge this hole with the 1/8” drill. The drill will tend to drift into the larger (old) hole. The
final size hole is to be 1/8”. A small rat-tail file would be useful in cleaning up this hole.
( ) Punch through the template near the upper left notch to be cut in the front panel. With a
small rat-tail file make the indicated notch in the meter cutout hole. A triangular file or the
edge of a rectangular file may also be used to make the notch (the notch does not have to
be round).
( ) Remove the template from the panel and trial fit the new meter. This will indicate whether
more filing is needed to obtain a good fit and have the top of the meter parallel with the top
of the front panel.
( ) When a good fit is obtained, fasten the meter to the front panel with the supplied washers
and nuts. If the plate meter is being replaced, leave off the washer and nut from the lower
left stud (viewed from the rear of the front panel).
( ) Unsolder the meter leads and bypass capacitor from the solder lugs that went to the old
meter.
( ) Cut the black and white leads going to the lamp assembly removed from the old meter.
Cut these leads close to the lamp assembly and strip about 1/8” of insulation from each
end. We will now reassemble the front panel.
( ) Bring the front panel up to the front of the amplifier chassis and put the meter switch and
sensitivity potentiometer shafts through their respective mounting holes. Loosely install the
mounting washers and nuts.
( ) Reinstall the meter leads on the meter not being replaced and tighten the meter terminal
nuts.
( ) If the plate meter is being replaced, place the supplied flat washer over the remaining
mounting stud, then the meter light terminal strip and finally the mounting nut. Tighten the
mounting nut firmly.
( ) Looking down at the back of the front panel, loop the RED meter wire through the “+”
terminal of the new meter (the terminal nearest the right edge of the front panel). DO NOT
solder yet.
( ) Loop the BLACK meter wire through the “-“ terminal of the meter. DO NOT solder yet.
( ) Loop the leads of the bypass capacitor through the two meter terminals and solder two
leads on each meter terminal lug.
( ) Connect and solder the meter lamp leads to the top solder lugs on the meter. These are
the internal lamp connections.