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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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12th Nov 2019, 4:25 pm | #1 |
Heptode
Join Date: Aug 2011
Location: Bristol, UK.
Posts: 538
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Quad 33 help
Hi all,
I'm repairing a quad 33 which won't power on. I've had a look inside and the cap and resistor across the mains switch has blown apart. The double pole switch is only working on one half. I was thinking of joining the neutral conductors together and leaving the working half of the switch for the live side. Does anyone know where I can get a modern equivalent of the damaged part? Is it absolutely essential? Many thanks. |
12th Nov 2019, 4:54 pm | #2 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,899
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Re: Quad 33 help
Capacitors and resistors are stocked all over the place, but a call to Quad might be your best bet for a replacement switch.
Those golden cased Rifa capacitors are notorious for doing that and they stink awful too. No surprise! Across the mains it needs to have a Class-X safety classification. David
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12th Nov 2019, 5:06 pm | #3 |
Heptode
Join Date: Aug 2011
Location: Bristol, UK.
Posts: 538
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Re: Quad 33 help
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12th Nov 2019, 5:19 pm | #4 |
Heptode
Join Date: Feb 2011
Location: Southend, Essex, UK.
Posts: 803
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Re: Quad 33 help
The original Rifa component was a cap and resistor in series in the one case. As said best place for the switch/pot is Quad, failing that Dada.
Alan |
13th Nov 2019, 10:32 am | #5 |
Hexode
Join Date: Jun 2011
Location: Glossop, Derbyshire, UK.
Posts: 487
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Re: Quad 33 help
Hi what upgrades are you doing to the 33 as I have done 15 of them in the DADA style see http://www.dadaelectronics.eu/shop/q...er-with-switch for the switch at 13.80 euros
also upgrade the power supply to 16v to give more headroom the DADA site has all the info . The cap is a RIFA type and RS do them ( it's to stop the switch from burning out ) Dave
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13th Nov 2019, 12:34 pm | #6 |
Heptode
Join Date: Feb 2011
Location: Southend, Essex, UK.
Posts: 803
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Re: Quad 33 help
I have carried out the Dada upgrades on a couple of 33's and found it well worthwhile. Components deteriorate so gradually it can go unnoticed but restoring things back as they should be (or better) you really appreciate what fine units these are.
On one of these there was a low level hum not altered by any switches/controls, one was an early unit, the other was much later and had an earth connection between power supply centre and mains earth socket. A similar connection was made to the early humming one which totally cured it. Alan |
13th Nov 2019, 12:54 pm | #7 |
Dekatron
Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,991
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Re: Quad 33 help
The switch failed on mine, and I bought a replacement from Quad. The track/track matching was truly dreadful, and returned it to them for a refund with the measurements.
I checked the track/track matching on the original and it was very, very close. So I lurked on eBay until I spotted a NOS single gang but with the same switch. So I transplanted a NOS switch onto the original QUAD pot. And used a non-RIFA capacitor/resistor snubber instead. Craig |