old signal gen

[billcreller]

 Well, I was up in my attic again, and discovered I had an old NRI National signal generator.  I see that the range, in multiple bands, is 535 KC ( I know, it those dam hertz now) all the way up to 6o megs.  There's an audio switch position on it, but no audio on the bands (??)
  The input is by way of a screw-on amphenol connector, so this thing must be a 40s piece.  Haven't looked inside it yet.  Likely has tubes.

[tubesornothing]

can you show us some pics?  sounds cool.  There is an input on it?

[HotBluePlates]

Definitely a radio oscillator of some kind. The "audio switch" may be to turn on audio frequency modulation, maybe for use in testing out that radio you're feeding signal into.

I am pretty ignorant of anything radio-frequency, but I have an obsessive-compulsive collection of some old Hewlett-Packard tube test equipment, and I seem to recall seeing a sig generator that was a similar setup.