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

[Robert Jefferis]

All,

I was aware of Gary Brown. I just wanted to see if any were available  
right away. I contacted Gary yesterday and I plan to ship the carcass  
to him tomorrow for rewinding.

I want to thank everyone for the tips and offers of pulls. The  
response volume was heartening to say the least.

73, Bob

On Feb 23, 2009, at 7:26 AM, Carl wrote:

> 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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