Re: General Radio 874 Connector, inner conductor "bendies"

Richard Knoppow

The General Radio part of the IEC site has many old GR catalogs. They will help identify the connectors used and those available as parts. GR used a couple of variations of binding posts, mostly combined with banana plugs or jacks. I have not checked but think the 274 type dual banana plugs and jacks had the same spacing for decades making them compatible. On many GR instruments with 874 connectors there is a combination binding post mounted under the coaxial connector. These are ground connections but a 274 dual banana plug with fit between the center part of the 874 and the binding post. This is sometimes handy where one is dealing with audio or low frequency RF although it does not have the effective shielding of the 874 connector.
GR made adapters going to nearly anything from the 874 and both GR and others, like Pomona, made adapters of all sorts for the 274.

On 8/20/2019 11:16 PM, Roy Thistle wrote:
On Sat, Aug 17, 2019 at 08:56 AM, Dale H. Cook wrote:

probably because they are AF, or RF units?
I found a 1001A that I though had a BNC output connector; but, it was an 874 to BNC adapter, inserted into the front panel 874.
I have some GR units, mostly older than 1950, mostly audio, 600 ohm stuff, I guess... mostly in wooden cabinets, so old I guess too... like a 546-C, with binding posts. (sometimes seen referred to 546-0, because of the front panel stenciling?).
Anyway, even though I have, and have run across GR stuff... my introduction to the 874 was on Tek stuff (like pulse gens, sample heads, and 7000 plugins)… which I was not interested in, at the time... so just made a note of that odd looking connector, on the front panel.
I guess that was just the peculiarity of my situation... which led me to think it was an old Tek connector, when it was really GR!
Best regards and wishes all.
Richard Knoppow

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