Custom VTVM Probe Set - Assembled - for Simpson 312 & 303-2 VTVMs

Description

This listing is for the
- KK4HXJ -
Simpson 312 Series assembled test probe set
This set will also work for the 303-2 version with the addition of a Banana Plug to the Ground lead
(the original 303 uses a different set)
When purchasing for a 303-2 advise me via email, and I will add the Banana Plug at no charge
The Simpson 312 series probe is very specific requiring a unique lead configuration
This Set is specialized for the
Simpson 312 (and 303-2)
and I am not aware of another VTVM that uses this specific layout
The 312 meter used a switchable probe plus a permanent Ground Lead
The new probes consist of:
A Siamese Probe (replaces switchable probe with 2 seperate leads connected to 1 connector):
DC Probe -  RG174 Coax Cable to a Black Test Probe with 1 Meg ohm 1/2 Watt Resistor)
AC/Ohms Probe - New Old Stock Microphone Connector - RG174 Coax Cable to a Red Test Probe  (Labeled "AC/Ohms")
Bare Black Test Lead Wire to Alligator Clip (will need to be soldered (internal) or spliced (external)to your meter
A word about the "Vintage Microphone Connector" - The microphone connectors used on these meter probes is a New Old Stock microphone Connector which has been out of production for roughly 40 years and so far I cannot find an accurate description for this style of connector - on the exterior it is identical to a Calrad MC150 connector but the threads are slightly different and Genuine NOS Calrad Connectors do not mate to the meter - The connector appears to be a generic version of an Amphenol 80-75MC1 but these too are so old I can find no specifications however, I can confirm that these connectors work on the Simpson Meter and match some of the Old Connectors I received with my 303 meter - due to rarity and age the supply of these connectors is growing exceedingly thin with most laying around in dusty store rooms and warehouses somewhere with no one knowing what they are!
The calrad/amphenol style connector is the 2nd from the right in the supplied comparison photo
(Left to Right - BNC, Switchcraft 2501F, Vintage Microphone Connector, Switchcraft 5501F)
The unit is presented in a Labeled, Retail Quality, Reusable, 4 Mil Poly Ziplock Bag and is wrapped with a Reusable Velcro Strip to keep the leads organized and ready.
This is hand assembled with the following components:
1 Pair of Genuine Philmore Test Probes - 1 Red/1 Black
1 Vintage Microphone Connector (also known as Amphenol "Mini" Mic Connector)
1 Meg Ohms of Resistance
1 Alligator Clip & Heat Shrink Tubing
2 Laminated Self Adhesive Probe Labels and Clear Heat Shrink Tubing to cover the probe labels, resulting in a professional and durable setup (see photos)
2 36" length of RG174 Coaxial Wire for DC Lead (Very Flexible - makes a great test lead)
1 36" Length of 18 Gauge Black Rubber Test Lead Wire (PowerWerx brand Very Flexible - High Quality) for the Ground Lead
The original instructions specify shielded cable for the DC lead, the original supplied wire was a coaxial microphone style wire, many people use either standard (unshielded) test probe wire for the leads or a shielded coaxial cable, I Supply a 36" piece of black RG174 for the DC lead and for the AC/Ohms lead and a 36" piece of black test probe wire for the ground
I have shipped these probes and kits to several dozen countries and have received nothing but praise for bot the kits and probes, I think you too will be pleased with this simple and durable set to get that old meter back in service!
I build and sell many probe and test lead sets click the link for current listings available in my Store:
https://www.ebay.com/str/kk4hxj/Custom-Test-Leads-Test-Probes-/_i.html?_storecat=27854182016
Feel free to contact me with any questions regarding this or any of my other probe assemblies or kits!
I Ship First Class with tracking to meet eBay Guidelines
U.S. Shipper - Ships immediately
I Combine shipping on all auctions -
Please add all items to shopping cart before checkout
- eBay usually charges the correct shipping - if you order more than 1 item and eBay does not calculate combined shipping correctly, you can either wait for an invoice with the total, or go ahead and pay for all items with ebay calculated shipping and I will refund you any overages, based upon the actual cost of shipping! - In no case will shipping ever exceed .20
Thanks for looking and 73's from Kentcraft, LLC & KK4HXJ eBay Store