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Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE! |
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26th Nov 2021, 2:14 pm | #1 |
Hexode
Join Date: May 2005
Location: Greater Manchester, UK.
Posts: 496
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20mm > 30mm fuse adaption
I keep a stock of a full range of 20mm fuses, however I don't stock many in 30mm.
At a pinch a 20mm fuse can be converted to fit a PCB/Paxolin mounted 30mm fuse holder by recovering the end caps from the dead 30mm fuse and soldering these, (reversed) onto the ends of the 20mm fuse. Obviously a suitably rated 20mm fuse should be used to replace the original. Chris Last edited by unitelex; 26th Nov 2021 at 2:18 pm. Reason: Added additional photo |
26th Nov 2021, 4:50 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,996
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Re: 20mm > 30mm fuse adaption
Take care when soldering to the end-caps of fuses; they are usually attached to the glass using a heat-melt glue. If you heat the end-cap to solder-heat the glue melts, then the increased air-pressure inside due to the heating will cause the end-cap to pop off!
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I'm the Operator of my Pocket Calculator. -Kraftwerk. |
26th Nov 2021, 5:43 pm | #3 |
Guest
Posts: n/a
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Re: 20mm > 30mm fuse adaption
Neat trick, now stored away just in case.
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26th Nov 2021, 6:38 pm | #4 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,106
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Re: 20mm > 30mm fuse adaption
- At least if the end does pop off it's a common size so we can afford to practice..bearing in mind old fuses sometimes just give up i will bear this in mind for my battery charger.
It might be an idea to fill the end caps with something inert once the modification has been done, to prevent them collapsing should the fuse be extracted clumsily from the holder in future I do know someone who (using very thin wire!) succesfully experimented with 'restuffing' unusual and rather old blown fuses, but admittedly they were low voltage medium current ones without a filling. Dave |
27th Nov 2021, 5:46 pm | #5 |
Hexode
Join Date: Jul 2009
Location: Wokingham, Berkshire, UK.
Posts: 437
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Re: 20mm > 30mm fuse adaption
I often have to repair some American amplifiers that have the "KTK" type fuses in them which are by expensive (Audiophool land?).
I just tack solder a 20mm PCB mounting type fuse holder to the outside of the prongs as a temporary measure and fit a 20 mm fuse until the job is working to my satisfaction. I cannot see any reason why you could not do the same here and solder the 20mm fuse holder to the 32mm (1.25") fuse holder. John |
27th Nov 2021, 6:17 pm | #6 | |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,996
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Re: 20mm > 30mm fuse adaption
Quote:
That I'm still alive shows that such recklessness has its place.
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I'm the Operator of my Pocket Calculator. -Kraftwerk. |
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9th Jan 2022, 4:12 am | #7 |
Heptode
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 664
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Re: 20mm > 30mm fuse adaption
The end caps can be filled with white sand and soldered on.
That is apparently what the Type 3ABC fuses used in microwave ovens and other military stuff here in the States use. (Same physical size as the 3AG, 3AGC, 3AGSB, or MDL series fuses). |