[Hallicrafters] Name that connector!

[Roy Morgan]

At 01:19 PM 7/27/02 -0400, F W Mooney wrote:
>  National RBL-6, which has two unusual connectors on the back.  Can 
> anyone identify
>The first one is a huge coaxial cable connector for 50 ohm coax:

Fred,

That looks like the old "Navy Connector" that was used on early RAL/RAK 
receivers and is the equivalent to the General Radio 700-series coax 
connector.  The mating connector has a smooth cylindrical split exterior 
shell and a center pin that is a female banana socket.  Some where in the 
1930's GR abandoned that system for the much improved 874 series of 
connectors.  The connectors you need are hard to fine nowadays, though 
persistence at hamfests may turn one up.  Luckly, most folks nowadays don't 
know what they are.

>The second one is a three wire AC line cord connector.

That is a "standard"  "Twist-Lock" connector by Hubbel.  I can't tell from 
your photo what the diameter is, but it looks like the smaller of the two 
most common sizes.  They can be had today I think from parts 
suppliers.  Yours has the center grounding pin and dis-similar curved 
locking tabs for line and neutral.

See:
<http://www.hubbell-wiring.com/library/pressreleases/h4572.pdf> for pictures.
This link seems to be a more complete catalog:
<http://www.hubbell-wiring.com/library/pressreleases/h4610.pdf>
It appears that what you need is a "2-Pole, three wire, grounding Connector 
Body" to put on the end of your power cord, but I can't find a picture of 
it in the above catalogs.

Further looking makes me think what you have is the "Midget" series and you 
need the HBL7593V  connector.  Try this link:
<http://www.hubbellcatalog.com/wiring/explorercat/catalog/locking/index2.htm>
and look for: 15 A 125 V, Midget series, Connector Body.  This one shows 
the center pin and two dissimlar curved outer connector blades.

I am currently working on two Bell and Howell commercial 16 mm movie 
projectors that both have two-bladed versions of that connector for the 
power cord.  They should, of course, both be three-wire grounding 
connectors. The projectors draw 10 amps or more, so the normal 
computer-style connector is unsuitable .  Most of those are rated at 3 to 5 
amps. max.  The Hubbel Twist-Lock ones are rated at 15 amps for the small 
ones, and the larger ones up to 50 amps at 480 volts AC.

The main web site is: <http://www.hubbell-wiring.com/>
If/when you find a source for these, let me know.

Roy





- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan at nist.gov --