[R-390] 390A audio

[Rasputin Novgorod]

> I'm not very happy with my audio.

Speaking of audio, for $50 at a hamfest, I picked up a
HP-3550a Carrier Test set (AN/USM-181), consisting of a
HP-209A audio Oscillator, HP-353A Impedance patch panel
and HP-403-B RMS Voltmeter 0.001vac to 300 vac (-60 to +50 dB).

This was originally used to test 600 ohm phone-lines and comms.
The patchbay is 135, 600 and 900 ohm impedance in/out. 
The patchbay and meter would be ideal to connect up to the 390A
600 ohm audio-out to measure levels when aligning, etc.

These useful things should be available surplus and cheap.
I'd forgotten I'd had it. I'd actually bought it for
the audio oscillator. These old fashioned CL oscillators
are suppose to be much cleaner than modern synthesized
oscillators, and I wanted to pair it with my distortion analyzer.
When I bought it, I didn't see any use for the patch bay,
and I had better meters; I'm glad I kept and restored it all.

Google shows Fair Radio with one. It's too expensive, but 
nice photo:
<http://www.fairradio.com/catalog.php?mode=view&categoryid=187>

Sincerely
/b




       
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