Jones plugs, or similar sorts of plugs

Mr Ian Primus wrote: It likely could be. A little treatise: There are two series of "Jones connectors", a large pin series and a small-pin series. One may also hear them referred to as Cinch connectors or Cinch-Jones connectors. The large-pin is the 2400 series and the small-pin the 300 series. http://www.cinch.com/view_product_line.cinch?id=29 catalog: http://www.cinch.com/products/pdf/Jones_PDF_Catalog1148360345.pdf Based on my observation (of equipment using them), the large-pin series goes back to at least WWII, probably earlier. They are a fairly heavy-duty connector and aren't seen all that frequently (IME). The pins are a flat blade about 1/4 inch wide. The small-pin series I believe was introduced sometime in the 40's. These were *extremely* common in a wide range of electronic equipment, particularly in the 50's and 60's, less so today but they are still available new. (I'm actually surprised at how many people here seem to be unaware of them). The pins are a flat blade about 1/8 inch wide. Number of contacts starts at 2 and goes up in increments of 1, 2 then 3 as they get larger, to at least 33. Black bakelite base; a range of mounting methods; plugs on older ones have a metal hood painted with black wrinkle-paint, newer ones (~70's+) the hoods are black plastic. They are nice from a convenience perspective but I tend to be leary of them formation on the pin surfaces and can be noisy for low-level signals. I don't know whether this is just an issue of age or whether the new ones have changed the plating and are (or will be into the future) better or the same. The web actually shows someone selling gold-plate versions which I had never seen before.