[Milsurplus] Repair of RF transformers

[Jim Whartenby]

I see that this message never made it through the reflector, I guess because of the two photo attachments.  
I have a few photos explaining how to disassemble the SRR-13 / FRR-23 RF transformers without breaking anything.  This allows the burnt winding to be replaced and the transformer to be reassembled and put back into service.  If there is any interest, send a request off reflector and I'll send the photos.Back to original note:
Replacement cranks can be made if you are handy, see:

http://www.roveroresearch.info/home/boatanchor-radios/srr13/srr-13a---switch-arms/crank-arms

Reworking the transformers requires some patience, a heat gun to soften the old epoxy and some small tools to dig the softened epoxy out of the forms.  All can be done without breaking anything so that the repaired transformer can be reassembled and appear to be as new.  I have a few old transformers if some need replacement parts.
I have found that there are really only two types of RF transformers: Oscillator and Amplifier.  All amplifier transformers are electrically the same if they are of the same frequency range.  Physically they are keyed to fit the particular module and a small Swiss file will add a new notch so that the transformer can be rotated to the proper orientation when installed in a different module.
See attachments, sorry if the size is a bit big for some if they don't have high speed internet connection.  I can send s few more photos if there is any interest.Regards,Jim
 I wonder why people argue over the 10% of their differences and ignore the 90% they agree on?

      From: David Stinson <arc5 at ix.netcom.com>
 To: 'Kenneth G. Gordon' <kgordon2006 at frontier.com>; 'Jim Whartenby' <antqradio at sbcglobal.net>; milsurplus at mailman.qth.net 
 Sent: Thursday, October 4, 2018 7:36 AM
 Subject: Re: [Milsurplus] Submini tubes
  


-----Original Message-----
From: Kenneth G. Gordon
Subject: Re: [Milsurplus] Submini tubes

On 4 Oct 2018 at 4:20, Jim Whartenby wrote:


Coils were a big problem. Still are. Also, those
damned pot-metal cranks.

However, I STILL see the SRR-11/12/13/13A
receivers as being excellent receivers. 
....................

I had the LF and HF versions when I was a kid and
really liked them, except for the blasted cranks.
Did you ever find a solution for the cracked-crank
problem?

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