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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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23rd Nov 2020, 6:34 pm | #1 |
Triode
Join Date: Oct 2020
Location: Tranent, East Lothian, Scotland, UK.
Posts: 17
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Heavy fabric sticky tape on transformer
I'm working away reassembling my old Bush radio. There's a heavy fabric sticky tape on the transformer, which, I assume, is heat resistant or similar. A piece has come off the side with the wiring connections to the rectifier circuit. Having lost its stickiness with age, it's not staying in place. Please can anyone advise what tape I should replace this with? Many thanks!
Chris |
23rd Nov 2020, 11:59 pm | #2 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,088
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Re: Heavy fabric sticky tape on transformer
Photo would help!
These days... Glass cloth tape, 3M type 69 or 79 (same fabric, different adhesives) will be good to 155 or 180 deg C. Available from RS, ISTR... And very likely eBay search will find. |
24th Nov 2020, 8:00 am | #3 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,669
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Re: Heavy fabric sticky tape on transformer
You could use Kapton tape to seal it back together,about a fiver a roll on ebay. You do have to go all the way round the bobbin/winding though so it can stick to itself. I've tried to patch a few similar tfmrs by taping most of the way round, doesn't last long.
Andy.
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Curiosity hasn't killed this cat...so far. |
24th Nov 2020, 11:16 am | #4 |
Triode
Join Date: Oct 2020
Location: Tranent, East Lothian, Scotland, UK.
Posts: 17
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Re: Heavy fabric sticky tape on transformer
Many thanks for the replies and advice on suitable tapes...apologies for the lack of a picture - should have done that...
Chris |
24th Nov 2020, 1:34 pm | #5 |
Triode
Join Date: Oct 2020
Location: Tranent, East Lothian, Scotland, UK.
Posts: 17
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Re: Heavy fabric sticky tape on transformer
Here's a couple of pictures of the transformer and the tape...the tape still wrapping the sides of the transformer is what still sticks - I haven't disturbed this unnecessarily...
Chris |
24th Nov 2020, 2:17 pm | #6 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,554
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Re: Heavy fabric sticky tape on transformer
That looks more like common "gaffer" tape than anything else I know of.
It is not obvious why it has been added to the outside of the clamp. Perhaps it is there as a cosmetic cover for the drop wires from the tags to the ends of the windings. |
24th Nov 2020, 2:18 pm | #7 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,088
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Re: Heavy fabric sticky tape on transformer
That looks as much like black gaffer tape as anything! Can't see the purpose.
Having said that, you won't go wrong replacing it with glass cloth tape, acrylic adhesive (not as high-temperature as silicone adhesive, but sticks better). Kapton tape, as Andy suggested, has great properties, excellent temperature capabilities. But adhesive used is silicone based, so as not to compromise the high-temperature performance, and it's not good except to a really smooth surface such as itself - again as Andy said. |
24th Nov 2020, 6:20 pm | #8 |
Triode
Join Date: Oct 2020
Location: Tranent, East Lothian, Scotland, UK.
Posts: 17
|
Re: Heavy fabric sticky tape on transformer
Thanks folks... It doesn't look very special tape to me, either! Certainly tears easily enough...
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27th Nov 2020, 7:19 am | #9 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,669
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Re: Heavy fabric sticky tape on transformer
That tfmr looks like it's been rewound or to secure the tag board and the tape outside the bobbin put there to stop shorts from the connecting wiring. BTW the or/blu wiring looks very long, needlessly so. If 240v mains goes through it it'll be chucking out EMI if heater maybe dropping voltage and EMI, might be worth sorting.
Andy.
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Curiosity hasn't killed this cat...so far. |