[Milsurplus] Repair of RF transformers

[Nick England]

Now on line at
http://www.navy-radio.com/rcvrs/srr13-repair.htm

Jim - please let me know if I messed up anything....
Cheers,
Nick England K4NYW
www.navy-radio.com


On Fri, Oct 5, 2018 at 1:26 PM Jim Whartenby <antqradio at sbcglobal.net>
wrote:

> Nick England has offered to host the photos and a short explanation of the
> procedure.  If there is any need to clarify any step, please let me know.
> It is pretty straight forward so once you try it should be a snap.  Just
> remember to go slow and easy does it.
> Jim
>
> I wonder why people argue over the 10% of their differences and ignore the
> 90% they agree on?
>
>
> ------------------------------
> *From:* Jim Whartenby <antqradio at sbcglobal.net>
> *To:* MilSurplus QSLNet <milsurplus at mailman.qth.net>
> *Sent:* Friday, October 5, 2018 8:54 AM
> *Subject:* Repair of RF transformers
>
> 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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