I recently rescued a beautiful piece of RCA Test Equipment from the
dumpster....literally. I suspect this gear was in a Broadcast Studio
here on campus. I further suspect it was used to test distortion and
noise levels in an AM Broadcast Transmitter.

Here are the details. large D'arsonval meter at top center calibrated
in percent distortion and noise level. There are switch positions for
Oscillator out (Two tone or four tone??), Bridging, Phase (Four of
them a,b,c,d!), Calibrate and a Mode switch.
The back panel has inputs/outputs for audio, RF, Bridging and
Oscillator. Metal tubes inside four transformers. 6sN7's, Gas
Regulators, 6f8 etc.

Here's the clincher, outside of the Red RCA Logo there is absolutely
nothing to identify the model of this chassis. Searching the web
produced only iffy results.
It suggests maybe a B-9c??


Any ideas???


TIA,


Tony WA6LZH