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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Sep Sun 13, 2020 5:44 pm 
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Joined: Jul Fri 10, 2020 11:10 pm
Posts: 268
Okay any last-minute advice?

I opened it up and it looks like the transformer wires ends are wrapped around and soldered to the wires that I am replacing then crimped for before leading out.

I'm going to put a small shim behind the connection and desolder with copper wick and then reverse engineer it back with the new lead.

I know color wires really don't matter but I puchace them when I was in a greener state and would like to use them. I have 600 volt wire and then the 200 wire I would like to use the 200 volt wire because it's thinner and easier to bend around. In the schematics it states the colored wires that lead out of the output transformer so I was just going to follow that as shown in the photo.

Thank you,


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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Sep Sun 13, 2020 6:59 pm 
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So if I could go back in time the biggest advice or hint that I could offer everyone is to listen to the sound advice given at the beginning of this thread.

For now I am on my own endeavor to gain experience in this setting and work myself out of what I got myself into.

With that said, will close out this thread out with a hearty thank you and will finish this up in the post that I should be at. I will be linking you all to it of course.


Thank you


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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Sep Sun 13, 2020 7:52 pm 
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Hello Greg,
sounds like this set has taught you some new ways?

After 40 plus years of working around electronics stuff like this is great because next time it will become a little easier.

Sincerely Rich


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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Sep Mon 14, 2020 12:45 am 
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Just remember that the ends of the primary winding (connected to the tube plates) have to withstand almost twice the B+ voltage under normal conditions and a lot more under abnormal conditions (like if the speaker becomes disconnected).

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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Sep Mon 14, 2020 2:21 am 
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Joined: Jul Fri 10, 2020 11:10 pm
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Thank you for the send off, gentlemen! I will miss my time at Hints & Kinks but I must now travel that lonely road to put the knowledge gained here to the test.

I will look further at the 600 volt wire as I wait for my mylar transformer tape to show but it is so thick...

Best regards,

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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Sep Tue 15, 2020 12:53 am 
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Joined: Jul Fri 10, 2020 11:10 pm
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I am sorry, I misspoke in the other post. The small profile cloth covered wire that I have is 300 volt rating 20 gauge it is Radio Daze wire. So 300v not 200.

I wish they made a small profile 600 volt cloth covered wire but I think we all have been down that road before as I notice in the other threads do I will not start it again.

Update.
I just ordered another full spectrum batch of 20 gauge stranded 600 volt cloth covered wire from Antique Electronic Supply. My gut tells me there will be no difference in thickness but I had to find out before moving on.

And when this batch arrives I'm going to supply measurements of all three sets of wires with notes and photos just in case I'm not the only one looking for the grail.

Thank you,

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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Oct Thu 08, 2020 2:39 pm 
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If the insulation is just friable, I usually just add a layer of heatshrink tubing over the leads. Maybe two layers where the leads exit the mouseholes in the transformer shell.


If feasible, you can replace the wires with new leads. This is a HT-32 transformer I worked on several years ago. The five volt rectifier leads are taped off because they commonly short to the adjacent HV windings internally.

Attachment:
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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Oct Wed 14, 2020 1:59 am 
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Joined: Jul Fri 10, 2020 11:10 pm
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That looks very nice!

This was one of my first thoughts on how to fix my crusty wires and now that I see your work I will keep this knowledge in store for the next occasion.

But I have not given up hope on my setting that I am now in. I just have been in preoccupied learning the ins-and-outs of being a radio man and kind of put that project on hold until the day I allow myself to graduate.

Thank you for posting your work!

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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Jun Sun 13, 2021 4:05 am 
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Hello,
Post from err ducks shows a picture of this Spaghetti Type sleeve product order form. What company is this from?

Thanks,
Walter


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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Aug Wed 25, 2021 10:29 am 
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fifties wrote:
I would try to avoid opening them up, and rather, strip the leads to bare wire and use spaghetti for insulation.

McMaster Carr sells a very flexible neophrene rubber heat shrink tubing at a decent price. It's always worked for me in this and lots of other applications.

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 Post subject: Re: How To Save Old, Brittle, Output Transformer Wires?
PostPosted: Aug Wed 25, 2021 9:30 pm 
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Walter Schwartz wrote:
Hello,
Post from err ducks shows a picture of this Spaghetti Type sleeve product order form. What company is this from?

Thanks,
Walter


Just Radios has it. I make sure I get some more every time I order resistors and capacitors.

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