[Jukebox-list] Old Cap/ Transformer Rewinding

Thu Nov 29 06:13:21 PST 2007

Don, I read your recent posting about the radiation treatment you're taking. I know that this can be very draining, and I wish you a very speedy and healthy recovery. Sounds like the prognosis is very favourable, and I'll keep you in my prayers. 

Mike 

-----Original Message-----
From: jukebox-list-bounces at lists.netlojix.com [mailto:jukebox-list-bounces at lists.netlojix.com] On Behalf Of Don
Sent: 2007, October, 05 5:17 PM
To: Jukebox mailing list
Subject: Re: [Jukebox-list] Old Cap/ Transformer Rewinding

Michael, I rewind transformers. Possibly even this one of yours.
Please contact me off list at dontutt AT telus.net

The remanufacturer can do the re-build by documenting the winding layers and turns and taps and wire guages as the transformer is unwound.

Don

----- Original Message -----
From: "Dicecco, Michael" <michael.dicecco at rbc.com>
To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
Sent: Friday, October 05, 2007 12:33 PM
Subject: RE: [Jukebox-list] Old Cap/ Transformer Rewinding

Don, can you recommend a place to get a transformer re-wound?

I have an old Stromberg-Carlson tv that has a worn vertical output
transformer. Can't find one anywhere! You've given me the idea of
getting the original rewound. Does the re-manufacturer need to know all
the original specs, or can they determine the values by examining the
old one?

Thanks

Mike

-----Original Message-----
From: jukebox-list-bounces at lists.netlojix.com
[mailto:jukebox-list-bounces at lists.netlojix.com] On Behalf Of Don
Sent: 2007, October, 05 3:08 PM
To: Jukebox mailing list
Subject: Re: [Jukebox-list] Old Cap question

Hi Ron,
Short answer is YES. The quality of the insulation will always make a
difference in the amount of heat these bigger transformers throw off. A
chap at a wire sales firm educated me on this and I'll try to get what
he said right.  In transformers there are losses. One of them is
interwinding losses. They occur when the wire's insulation is poor. In
the case of the older transformers wound in the 30's, 40's and maybe
into the 50's a single coat of some kind of vanish was used as
insulation. Over the years of heat cycles this varnish insulation brakes
down and becomes a poorer insulator.
This means less interwinding resistance and so small leakage currents
become larger between the adjacent wires. These leakage currents are
tantamount to small shorts and these generate the extra heat you would
not see from the same transformer when new.
Of course these days better insulating compounds than varnish are used.
No wire today is made using less than two coats of insulation so....
when you take the trouble to rewind that old 40's xfmr it WILL run even
cooler under the same loads, than when new.
Hope this makes it clearer.

respectfully submitted,
don

----- Original Message -----
From: "Ron Rich" <ronnnrich at yahoo.com>
To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
Sent: Thursday, October 04, 2007 8:00 PM
Subject: Re: [Jukebox-list] Old Cap question

> Don,
>  Dumb question dept.
>  Why would the insulation make a difference in heat--unless the old
> insulation was shorting out?  In other words, would a new wire with
the
> older style varnish run hotter the the new double coated wire of
today?
> ( I think that's what you are saying) Ron Rich
>
> Don <dontutt at telus.net> wrote:
>  Hey Jeff!
> I'll chime in with the same lesson or whatever you want to call it....
> except for failed power transformers. Had one that you could cook eggs
on.
> Rewound it and it ran about as cool as the chassis under it. Not so
> amazing,
> because these new "enamelled or poly-something" wires are double or
triple
> coated so their insulation factor is vastly better than the older
> varnished
> wire .......yes, we do these cap change things etc because.....
well....
> its time.
> Don
>
>
>
>
>
> ----- Original Message ----- 
> From: "Jeff Zurn"
> To: "Jukebox mailing list"
> Sent: Thursday, October 04, 2007 3:23 PM
> Subject: Re: [Jukebox-list] Old Cap question
>
>
>> Thanks for the post, Ron...
>> I just have to point out the Yahoo tag that was added to your email.
>>
>> ---------------------------------
>> Fussy? Opinionated? Impossible to please? Perfect. Join Yahoo!'s user
>> panel and lay it on us.
>>
>> Maybe I'm the only one who thinks that is funny... but as 'nostalgia
>> techs'... aren't we?
>>
>> ----- Original Message ----- 
>> From: "Ron Rich"
>> To:
>> Sent: Thursday, October 04, 2007 2:46 PM
>> Subject: [Jukebox-list] Old Cap question
>>
>>
>> Hi All,
>> I had a guy bring me a Seeburg Tormat Control Center (TCC-1) from a
LPC
>> yesterday. I suggested that all the tubes/resistors be
checked/replaced
>> as
>> needed, and that all (original) lytic and "paper" caps should be
changed.
>> He was somewhat agressive at that last remark, and wanted to know
"why
>> ALL
>> of them". I really had no answer, except the stock "they are 40+
years
>> old, and tend to fail, taking the transformer out". Well, he finally
told
>> me to do it.
>> Upon starting to trouble shoot something like that, I usually grab my
>> Variac form the shelf above the bench, but since my back was killing
me
>> (better now--thanks), I did not want to lift it down, and used my
>> metered/fused ac plug.
>> Well, on power up, the needle jumped to somewhere around 4 amps. It
then
>> settled down to about 1.75 amps and I started checking voltages. The
-25
>> dc was zero, so I changed the cap-it was open. I then powered it back
>> up--still was drawing about 1.75 amps--all voltages checked within
range
>> and the 2050's would fire on command.
>> I went on to replace the rest of the caps, then turned it back on. I
was
>> suprised. At first I thought that something had blown the fuse on my
>> meter
>> (like me "goofing-up"). But then I noticed that the 2050 filiment was
>> getting red--and so were the rest of the tubes--but my meter was
reading
>> only about .25 amp. Went on to do all the other checks--it's perfect.
>> I now have a GREAT answer for that question, and thought you other
>> "techs" mite like to use it---Ron Rich
>>
>>
>> ---------------------------------
>> Fussy? Opinionated? Impossible to please? Perfect. Join Yahoo!'s user
>> panel and lay it on us.
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This e-mail may be privileged and/or confidential, and the sender does not waive any related rights and obligations.
Any distribution, use or copying of this e-mail or the information it contains by other than an intended recipient is unauthorized.
If you received this e-mail in error, please advise me (by return e-mail or otherwise) immediately.  

Ce courrier électronique est confidentiel et protégé. L'expéditeur ne renonce pas aux droits et obligations qui s'y rapportent.
Toute diffusion, utilisation ou copie de ce message ou des renseignements qu'il contient par une personne autre que le (les) destinataire(s) désigné(s) est interdite.
Si vous recevez ce courrier électronique par erreur, veuillez m'en aviser immédiatement, par retour de courrier électronique ou par un autre moyen.