[R-390] Meters for R390A

[n4buq at knology.net]

> They are tough to find. There are a few good looking replacements that you
> can use but the problem is that the carrier level meter impedance is 17
> ohms. Anything other than this and the darn thing won't work. I suppose 
you
> could make a small op-amp circuit that mounted behind the meter but a
> standard 1 ma movement won't work. The s meter circuit uses a bridge 
design
> and depends on the meter's impedance.
> 
> Roger WA3YTM

Jan Skirrow has a good article on this:

http://skirrow.org/Boatanchors/TechTalk2.pdf

Barry - N4BUQ