Making an Adaptor from the vintage single wire 5/8" screw on MIC connector to BNC

You can use these:

Or you can do what I did.

1. Remove spring from connector.
2. Drill out connector back with 11/32" drill.
3. Tap connector shell using 3/8-32 tap.
4. Solder #16 wire to solder cup on back of BNC female.
5. Stick wire through connect grommet in Amphenol connector.
6. Screw BNC into connector shell. Tighten.
7. Solder wire to Amphenol connector grommet.
8. Cut wire, smooth with file.

Presto! Instant, sort of, Amphenol Microphone to BNC adapter.

--
"I am a river to my people." 
Jeff-1.0 
WA6FWi 
http:foxsmercantile.com

If you don't mind buying from Chinese sellers and waiting a month or so for delivery, Ebay item 113114727770 is what you're after if you don't have the tooling for a crimp style connector (Ebay # 323326819341). Or, you could get several of these (Ebay # 392106541719) with the BNC already assembled onto the cable, Just cut off the banana plugs and solder your mic connectors onto the cable.

Cheers, Dave M

Don't you want a UHF BNC adapter? Take a look at images.google.com with that search string...

The UHF center socket takes a banana plug, so putting a ground banana compatible post next to the coax connector can let you use a dual-banana-to-BNC as well.

You can remove the spring from the mic connector and drill the opening out enough to remove the plating. Then take a single hole style BNC connector and file the threads down until it fits in the mic connector. Solder a wire onto the center of the BNC and feed it through the hole in the mic connector. Then solder the BNC into the back of the mic connector and solder the center contact. That's how I made mine. It avoids having to come up with an unusual size tap.

--
Jim Mueller wrongname@nospam.com 

To get my real email address, replace wrongname with eggmen. 
Then replace nospam with expressmail.  Lastly, replace com with dk.

Except....A UHF connector is 5/8-24 pitch. The Amphenol button connector is 3/8-27 pitch. Unless you consider cross threading a feature, they are not compatible.

--
"I am a river to my people." 
Jeff-1.0 
WA6FWi 
http:foxsmercantile.com

I was holding both parts in hand and thinking about doing something like that, except my thought was to epoxy the BNC into the Mic connector. (of course making sure they fit tight so there is a good connection on the ground side).

There have been lots of great suggestions in this thread!

Oh, then the 'easiest' solution I'm aware of is a pogo pin soldered in a BNC fitting, and a lathe-job threaded tube, 3/8-27 to 38-32, to mate the threads.

I'm not sure I've ever encountered 3/8-27, but I have taps for 3/8-24./ -26. /-32

Is this about the connector depicted here at the top left of page M-6 ?

Yes.

5/8-27 Industry standard.

--
"I am a river to my people." 
Jeff-1.0 
WA6FWi 
http:foxsmercantile.com

Lots of people who aren't machinists or who work with lamp fittings could easily think that a 1/8-27 straight pipe thread is 3/8-27. This is because 1/8-27 straight pipe thread has a major diameter of .394" to .390", which is only .019" to .015" over the major diameter of a

3/8 thread. And as sloppy as some threads are made, especially the threads on lamp fittings, the mistake is even easier to make. I have had more than one person ask me to either tap holes for 3/8-27 or if I knew where to buy a tap for that thread because they had no luck looking in catalogs or online for the elusive 3/8-27 tap. Eric

CORRECTION The Amphenol button connector is 5/8-27 pitch.

--
"I am a river to my people." 
Jeff-1.0 
WA6FWi 
http:foxsmercantile.com

Pogo pin???? What's that?

Yes.

I would have been more descriptive in my original posting, but it seems there are numerous names for them, and not a standard "name". But most people seem to understand "vintage ONE pin MIC connector".

It seems a lot of people hate them, and want to replace all of them with BNC. Personally, I like those oldies. Sure it takes a few seconds longer to screw them on, but they worked well, and under normal use, they were not changed all that often. Plus, they were versatile, since they were both male and female, by using or removing the "ring". That alone was an ingenious invention.

I may be wrong, but I believe they were originally designed for microphone use, and later adapted for test gear connections. I can see why they were later replaced by modern microphone connectors, having 3 connections, since the microphones needed better shielding and impedance matching. But for use on test equip. they still work great.

The hardest part these days, is finding the connectors ends at a reasonable price. Someone always has them on ebay, but usually at ridiculous prices. From my understanding, they are no longer manufactured, so all that exist are NOS. Fortunately I was able to buy 3 of them awhile back at a fair price and they were new in the package. I now wish I had gotten a few more from the seller..... I think he had around 10 of them total.

A two-piece (concentric cylinders) electrical contact. Think "piece of brass rod, slid into a brass tube, with a spring at the base".

See

for one example of how they're used. This is a JTAG connector with 8 pogo pins. It can be pressed down onto an 8-pad through-hole pattern on the board (preferable one populated with a machined-pin socket, although you could probably make it work just with plated-through holes).

is similar, for a SOIC pattern.