[Collins] Seeking 75S-3B T7 audio output transformer.

[Carl]

Im surprised that nobody mentioned Gary at 
http://members.tripod.com/tubes_tubes_tubes/transformerrewindingservice/

He is a member of many forums and does good work at reasonable cost. He 
often has in parts queens of many brands.

Carl
KM1H




----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: "Kim Herron" <kim.herron at sbcglobal.net>
Cc: <collins at mailman.qth.net>
Sent: Sunday, February 22, 2009 10:52 PM
Subject: Re: [Collins] Seeking 75S-3B T7 audio output transformer.


> On Sun, 2009-02-22 at 22:28 -0500, Kim Herron wrote:
>> You have another alternative here if need be.  Contact Phil at 
>> Heyboer
>> Transformer in Grand Haven MI. Check the website for contact info. 
>> They can
>> build them if you have the specs, and the manual should give it to 
>> you.
>> They are always looking for this type of stuff.  You might also 
>> contact Jeff
>> Weinberg of Harbach Electronics.  He might have a lead as well.
>>
>> Kim Herron W8ZV
>> www.goldenradioservice.com
>> kim.herron at sbcglobal.net
>> 1-616-677-3706
>>
> Another source to check. Harbach has Peter W. Dahl's name and formulas
> and some time ago PWD wanted $125 for that transformer. But Harbach 
> does
> not show the audio output transformer on their current price list, but
> they do show it in their catalog of possibilities.
>
>> COLLINS 75S-3B AUDIO OUTPUT P/N 667-0302-00
>> CORE) EI-050 X .5 STYLE #) 01 E-I LAMINATED CORE
>> PR) 70 VAC 100-3000 HZ 2500 OHMS (PLATE-B+)
>> S1) 0-2.8-31.3 VAC, 4/500 OHMS @ 1.9 WATTS
>> DM) HT = 1.393 WT = 1.705 DT = 1.200 MD = 0.000 MW = 2.000 WEIGHT) 
>> LBS
>>
> As far as I know, I don't need one. Jefferis needs one and searching 
> the
> internet with google found mostly unanswered requests.
>
> There are several ways to solve the need from using two stock 
> transformers
> to modifying the windings on a readily available ($12.63) power 
> transformer
> to rewinding from the remains, to acquiring the materials and winding 
> from
> scratch. I'm sure Hammond, Harbach, or Heyboer can wind from scratch 
> cheaper
> than I can, but their price may not get decent until they wind them in
> quantity. So I'm exploring a little to see what there might be for a 
> market
> to be supplied by a one man shop, as a retirement business.
>
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
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