[Fwd: Re: [HEATH-TEMPE] VTVM test lead]

[Ron]

G. Beat wrote:
> ----- Original Message ----- From: "Malcolm Leonard" 
> <radiorepair at MINDSPRING.COM>
> To: <HEATH at LISTSERV.TEMPE.GOV>
> Sent: Sunday, May 15, 2005 12:43 PM
> Subject: Re: [HEATH-TEMPE] vtvm test lead
> 
> 
>> The probes are on page 1468 in Mouser catalog 622.
>> There are two stock numbers.The black one is 17PR122. The red one one 
>> is 17PR121.
>> They cost $1.23 each.
>> The proper phone plugs are  military  surplus type PL55.
>> Try Fair Radio Sales or Surplus Sales of Nebraska for those.
>> Hosefelt Electronics has the RG58/AU by the foot at 14 cents per foot.
>> If you put that resistor inside the VTVM case you defeat the whole 
>> design purpose and philosophy of the Heath engineers and limit the 
>> usefulness of your VTVM.
>> Malcolm Leonard
>>
> Malcolm -
> 
> An update.
> 
> I have talked to both Fair Radio Sales, SSN as well as Switchcraft (here 
> in Chicago) regarding the PL55 1/4" plug (with wide insulation between 
> tip and sleeve - where ring would be for a stereo style plug).

Consider using a stereo plug with the ring contact
clipped off. I am not sure what the effective
voltage rating will be, but it should be about
twice the rating between ring and sleeve.

> 
> Not avaialble.
> Could Switchcraft mfg it ? ... Yes, BUT the minimum $$ is high for 
> set-up for such a production run.
> 
> I have also researched locating the threaded alligator clip that went on 
> the tip of the original Heath probe.  No current test lead/clip mfg. 
> (e.g. Mueller, others) produces these in the 4-40 thread (large threads 
> - yes).

Heathkit shipped two kinds of probes for the VTVM. One
had a solid tip with a rubber sleeve. The tip was
notched just under the sleeve, so it was possible to
hang the probe on a wire resting on the notch, with the
sleeve holding it in place. The other kind had an
external thread and came with an internally threaded
alligator clip.

I am not sure which kind came first. I have only seen
one probe with the alligator. It came with an IM-28 that
I have just parted to cannibalize the meter. All other
probes I have seen (including a bunch of IM-13s that I
assembled in the early 70s) had the rubber sleeve.

-- Ron




  >
> Greg
> w9gb

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