In article ,
Henry Kolesnik wrote:
Had one follow me home from the local hamfest. It's a Comparison Bridge
with a 2" scope from the mid 50s. Neat looking box. Anyone got any
info, manual or what
its primary application was/is?
pic posted to http://s97.photobucket.com/albums/l237/wd5jfr/

It's a device for comparing two unknown impedances. Very handy if you
want to make up a bunch of coils that match perfectly.

Not quite as handy as an adjustable bridge for determining the value of an
unknown, but if you combined it with a decade capacitor box and a variable
inductor, you could use it for that.

IET Labs is working hard on getting a lot of GenRad manuals up, on
http://www.ietlabs.com/pdf/Manuals/index.html now. They don't have
a 1604 manual, but you might be able to request one.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."