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

[Fern]

Contact Hammond Manufacturing and they should be able to make one for you. 
At least they would if Fred Hammond, VE3HC was still around.    Fern   VE7GZ


----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: <collins at mailman.qth.net>
Sent: Sunday, February 22, 2009 12:52 PM
Subject: Re: [Collins] Seeking 75S-3B T7 audio output transformer.


> On Sun, 2009-02-22 at 10:17 -0800, Robert Jefferis wrote:
>> Hello to the list:
>>
>> My 75S-3B went sneakers up. I have traced the problem to T7, Collins P/
>> N 667-0302-000. Are there any replacements available out there? Thanks.
>>
>> Bob, KF6BC
>>
> Google shows a universal long term want, from individuals to the
> government. It also fits KWM-2 and 51S-1().
>
> Hammond shows a universal that might work, but it does not have the
> anti-vox and headphone outputs directly.
>
> http://www.harbachelectronics.com/_mgxftp/pwdamateur/PWDAMATEURC.PDF may
> be able to make one. They have the formula from Peter W. Dahl, but no
> price in the price list.
>
> http://www.therfshop.com/catalog/hamtrans011404.htm shows one for $125.
>
> Most any 5 tube AC/DC radio has one that will drive the speaker but not
> the antivox and head phone (500 ohm) outputs. However a tiny 500 ohm to
> speaker transformer for transistors would fill that need, since both
> those are low power loads.
>
> Looks like the Hammond universal 3 or 5 watt for the 2500 ohm to 4 ohm
> transformation 125A or 125B (better match to the mounting holes) and a
> tiny Tamura model MET-35 or Xicon 42TL001-RC or 42TM001-RC or 42TM026-RC
> or 42TU400-RC. Mouser catalog numbers 546-125A, 546-125B, and 838-
> MET-35. The rest are already Mouser catalog numbers.
>
> Clearly there's a market niche that needs filling.
>
> Be sure the output tube plate to ground capacitor is not the trouble.
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Collins at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG.
> Version: 7.5.552 / Virus Database: 270.11.2/1963 - Release Date: 2/20/2009 
> 7:22 PM
>
>