Hello folks. I just picked up a General Radio 684A Modulated Oscillator. It's in real good condition. The only problem is that I can't seem to find any info on it like an instruction manual or schematic. I wonder if anybody here has anything that can help? Thanks. :dunno:

There's a little info in this PDF, on page 104 of the General Radio catalog.

http://www.americanradiohistory.com/Archive-Catalogs/Miscellaneous-Manufacturers/General-Radio-Catalog-K-1938.pdf

Radiomuseum.org may have more info, but I'm not a subscriber so I can't look into that.

There's a little info in this PDF, on page 104 of the General Radio catalog.

http://www.americanradiohistory.com/Archive-Catalogs/Miscellaneous-Manufacturers/General-Radio-Catalog-K-1938.pdf

Radiomuseum.org may have more info, but I'm not a subscriber so I can't look into that.


Thanks for the info, but I already have that limited information. I have a paid membership to the Radio Museum, but all they have is just a picture of the face.

If you have any further info, or if anyone else does, I would greatly appreciate it.:thmbsp: