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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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23rd Mar 2017, 3:39 am | #1 |
Tetrode
Join Date: Mar 2010
Location: Newport Pagnell, Buckinghamshire, UK.
Posts: 57
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AF117 Hacker Sov 1
Had the whisker fault appear on my sov1 around Christmas 2015, confined temporarily to the case in the shed with a few of its brothers and sisters.
Well, the reason I am posting, I think I may have a permanent fix. After experimenting on a few donor set 117s, using caps to fry the shorts, I cut one across the diameter around 1.3mm above the base. (tried four previous and ******** them up) Blew air across the internals then pushed the uncanned 117 into a car dust cap, soldered in, works perfect. (Labelled 117) I'm still waiting for it to fail, not a problem at all, saying that I recanned using black plastic dust caps. I did trash maybe six 117 to Get one working. That was 2013, set still ok now. Is very fiddly to do, but worth it. |
24th Mar 2017, 10:44 am | #2 |
Pentode
Join Date: Jan 2013
Location: Nottingham, Notts. UK.
Posts: 228
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Re: AF117 Hacker Sov 1
I've got a few 'tyred' AF117s so maybe I should try that!
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24th Mar 2017, 10:56 am | #3 |
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
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Re: AF117 Hacker Sov 1
I have de-canned many by heating with a soldering iron, cleaned the silicone grease out and put the can back dry, they work too.
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24th Mar 2017, 12:24 pm | #4 |
Heptode
Join Date: Apr 2016
Location: Cheltenham, Gloucestershire, UK.
Posts: 875
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Re: AF117 Hacker Sov 1
Makes you wonder whether they ever did require screening - given that their pre-decessors were glass enclosures and Osiris is using a plastic dust cap ...... in fact, introducing the grounded fourth pin usually only ultimately served to exacerbate matters!
I suppose that the use of stamped-out malleable thin metal [in this case unfortunately a tin alloy] was [and is/remains] much cheaper than the production of glass envelopes
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24th Mar 2017, 11:01 pm | #5 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,199
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Re: AF117 Hacker Sov 1
What does such a dust cap look like? I have no mental image available.
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24th Mar 2017, 11:09 pm | #6 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,936
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Re: AF117 Hacker Sov 1
It is the cap that screws onto a car or bike tyre Schrader valve to keep it clean.
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