I suspect that the WECO 372A is made up of two WECO 358A plugs along-side each other ‘cos we always used a pair of WECO 477B sockets for 124 Ohm on the front panel. In fact the ones we used were supplied direct
from Western Electric for contract products ‘cos the genuine article is not available commercially (I think). For Options such as on the 3586B, I believe the connectors used would be “commercial equivalents” of the WECO products. Trompeter and ADC (Minneapolis?) are the two manufacturers which mainly come to mind.
Regards Bill Lauchlan
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...]
Sent: Friday, October 13, 2017 11:06 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: Just purchased HP 3586B--EBAY
The RCA 50 ohm WECO type connector for broadcast patch panels has a .050" pin diameter. The standard WECO 358A 75 ohm connector has a .090" diameter pin. Both possess a .375" diameter barrel. The mini-WECO (WECO 440) has a totally different barrel diameter (.298"). HP specifies a WECO 372A connector to fit the 124 ohm port.
It is worth checking to see if the 3506B has option 001. If so, HP uses the 358A/75 ohm & 372A/124 ohm connectors. The three units I have here all have option 001. If it is a model with non-optioning (one of the more rare units from what I have found), the 75 ohm input uses the WECO 439/440A (mini-WECO), the 124 ohm input uses the WECO 443A, the 135 ohm input uses the WECO 431A and the 600 ohm input uses the WECO 310 (TRS plug).
And a word of caution on the 310 plug. Although it looks like a standard 1/4" stereo plug, it is not. Dimensions are different and the tip and ring are of a smaller diameter. Pushing a standard stereo plug into the jack on the unit will most likely either distort the jack contacts or damage them requiring replacement of the jack..
Greg
