On Sun, 27 Jul 2008 08:24:12 -0700, terry wrote:

some deleted:

Have replacement meter (said to be from a Heathkit) approx same dimensions
which mechanically fits perfectly; but has an fsd of about 100 microamps
(I think) whereas the old damaged one appears to be about 30 microamps
fsd.

Idea is to fit a small DC amplifier mounted on a piece of vero-board etc.
inside to amplify the DC signal that comes through the range and FWD/REV
switch from the probes.

more deleted:

Terry you should check to see if the meter circuit contains a shunt and if
so try adjusting it for the coser to the proper range. If you can obtain a
movement that is identical except for the scale the original meter face an
probablt be placed on the working mechanism to render a more original look.

Using an amplifier in a sensitive circuit like a swr bridge is problematic
since the amplifier itself will respond with frequency sensitive gains.

You might want to go to some of the surplus sites that still do exist like:

Fair Radio Sales
http://www.fairradio.com/

American Science and Surplus
http://www.sciplus.com/