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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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27th May 2020, 12:03 pm | #1 |
Hexode
Join Date: May 2013
Location: Middlesbrough, North Yorkshire, UK.
Posts: 442
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Crackling audio potentiometer on Roberts Radio 200
Hi, Just thought I would just post this for interest. I have an old R200 Roberts Radio. Works well but a really bad pot meant trying to adjust volume was a nightmare. So instead of replacing the pot I opened it up and used a pencil and scribbled all over the plate. I don't know how long it will last but at the minute it works perfectly! Any comments are welcome.
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27th May 2020, 12:06 pm | #2 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,947
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Re: Crackling audio potentiometer on Roberts Radio 200
Yes, well known bodge which may continue to work for ages.
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27th May 2020, 6:31 pm | #3 |
Nonode
Join Date: Nov 2016
Location: Aberaeron, Ceredigion, Wales, UK.
Posts: 2,884
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Re: Crackling audio potentiometer on Roberts Radio 200
Yes that was done back in my days on the bench, can’t say how long it would last.
John |
27th May 2020, 6:57 pm | #4 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,998
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Re: Crackling audio potentiometer on Roberts Radio 200
I've done that in the past, and it's a good way to 'extend' the life of a failing pot.
One fault I also seem to be seeing more and more is contact-failures between the carbon-deposited pot track itself and the metal tags/rivets at the track ends. When this happens - usually when the volume-control is at the bottom end of its travel - the result is the radio suddenly delivering near-maximum volume. Sometimes you can *g-e-n-t-l-y* extract the track and the tags as one from the pot-body then give them a tap with a toffee-hammer and a drift to re-peen the rivets and restore electrical continuity. |
27th May 2020, 7:06 pm | #5 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Crackling audio potentiometer on Roberts Radio 200
I have used conductive paint on the end rivets and track
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