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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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13th Jun 2021, 10:33 am | #1 |
Pentode
Join Date: May 2021
Location: Buckinghamshire, UK.
Posts: 133
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Faulty on/off volume pot on a Hacker GP42
Hi there everyone.
I have found that the on/off volume pot (RV1) on my GP42 is faulty, the player is powered up as soon as its switched on from the mains and the on/off on the player doesn't do anything. The volume control works fine however but the pot feels very rough when turned. I have given it a good blast of Servisol but its made no difference. Is it possible to replace it and if so I would be hugely grateful for some advice on what and where to buy one. Thanks for any help on this! Paul |
13th Jun 2021, 11:11 am | #2 |
Heptode
Join Date: Feb 2007
Location: West London, UK.
Posts: 867
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Re: Faulty on/off volume pot on a Hacker GP42
I think it is a 1 M ohm potentiometer (volume control) with switch.
Not so easy to find now I do not know the size and length of the shaft in the Hacker but here is a link to one supplier. Not sure if they still supply UK now. https://www.tundtmusic.com/Potentiom...ml?language=en I am sure that some other members will be able to give you more advice. You will need to solder in the new part. John |
13th Jun 2021, 11:11 am | #3 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
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Re: Faulty on/off volume pot on a Hacker GP42
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
13th Jun 2021, 12:14 pm | #4 |
Pentode
Join Date: May 2021
Location: Buckinghamshire, UK.
Posts: 133
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Re: Faulty on/off volume pot on a Hacker GP42
Thanks guys appreciate the info.
I think the shaft on the one of that website looks too short, I need to remove the tone control unit from the player to have a proper look. I guess my only option would be to try and fix it, I'll have a crack at that when I have a few hours spare... |
13th Jun 2021, 2:43 pm | #5 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,336
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Re: Faulty on/off volume pot on a Hacker GP42
You have 2 options - either leave as is and disconnect from the mains when not in use or fit a new/rebuilt pot. If fitting a new potentiometer there is more to this than you may think in terms of sourcing the correct 1meg DPSW component, adjusting the shaft size and removal of the tone control sub-assembly. We assume you have the necessary soldering and electrical skills.
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Edward. |
13th Jun 2021, 3:55 pm | #6 |
Pentode
Join Date: May 2021
Location: Buckinghamshire, UK.
Posts: 133
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Re: Faulty on/off volume pot on a Hacker GP42
Thanks Edward I am experienced with electronics although with a bias to amateur radio equipment. So I have no problem with the repair you suggest. I think for now though I’ll just enjoy using it and fix it when I get round to it!
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13th Jun 2021, 11:29 pm | #7 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Faulty on/off volume pot on a Hacker GP42
Would one of these do the job?
https://www.blore-ed.com/product-pag...-potentiometer
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Frank |
14th Jun 2021, 8:46 am | #8 |
Pentode
Join Date: May 2021
Location: Buckinghamshire, UK.
Posts: 133
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Re: Faulty on/off volume pot on a Hacker GP42
Looks like they can supply one thanks Frank! Just a question though do I need a linear or log type?
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14th Jun 2021, 9:23 am | #9 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Faulty on/off volume pot on a Hacker GP42
I would expect it to be log, but measure the old one to be sure.
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Frank |
14th Jun 2021, 10:37 am | #10 | |
Heptode
Join Date: Dec 2008
Location: Somerset, UK.
Posts: 555
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Re: Faulty on/off volume pot on a Hacker GP42
Quote:
I cannot remember, but there may be a minimum order charge, expect delivery and vat. Alan |
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21st Jun 2021, 9:19 am | #11 |
Dekatron
Join Date: Oct 2003
Location: Southport Lancashire, UK.
Posts: 3,236
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Re: Faulty on/off volume pot on a Hacker GP42
As StationX says these can be repaired. I have also had good results with crackly volume controls by cleaning the track then packing it with Vaseline. It is rather counter intuitive but I did it with a mid '30s radio several years ago and it still works perfectly. I got the idea from someone who said they pack it with Waxoyl but I would have thought that the thinner in that would evaporate leaving thick, hard wax.
I imagine that the silicone grease recommended for the switch would work as well as Vaseline on the track
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Paul |
21st Jun 2021, 2:45 pm | #12 |
Pentode
Join Date: May 2021
Location: Buckinghamshire, UK.
Posts: 133
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Re: Faulty on/off volume pot on a Hacker GP42
Thanks Paul
It’s fixed now and seems fine so far! |