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Old 31st May 2005, 11:56 AM   #1
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Default Quad 44 - problems with used preamplifier

Hi, to all
I have bought used on ebay an QUAD 44 preamplifier. I have found the filter on the push-button of ignition is broken. I ask to you if it's necessary and with what I can replace such member.
The slot where it is present the input phono do not sound on the left channel, but moving the card on an other slot this works correctly. I suspect that the problem is on central board therefore
I have replaced all the condensers on the central motherboard with new condensers that have same capacitance but advanced tension.
After some minutes of operation all led begin to ignite itself and to extinguish and feels a metallic noise like if the relè of the commutation of the incomes were activated and deactivated. There is someone that can gives some suggestion to me on what to control and like?
Thanks.
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Old 30th March 2006, 03:59 PM   #2
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Default quad 44

I have also just bought a Quad 44 preamp, also my 44 does not work on the left when set on stereo, but works on both sides if on mono, Is that the same as you?, we must try to find the solution.
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Old 30th March 2006, 04:05 PM   #3
anatech is offline anatech  Canada
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Hi,
Bad solder joints on the main board are common. I think there was something about CPU lock up too or something. There was a tech note on it.

-Chris
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Old 30th March 2006, 04:48 PM   #4
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In both the QUAD 34 and 44, abnormalties are quite easy to track down, and as stated by anatech, it seems to be a bad solder joint
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Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
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Old 30th March 2006, 05:02 PM   #5
anatech is offline anatech  Canada
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Things are seeping back into the consiousness. The vias from one side of the board to the other. Just do them all, don't troubleshoot (like early Philips CD players - just resolder).

-Chris
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Old 1st March 2010, 11:36 AM   #6
ezr1 is offline ezr1  Israel
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hello and thanks

iwill ask you fox if quad pre 44 will be good match]

with my an old quad classic 2 mono block 2x15w


thanks ezra
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Old 24th July 2011, 06:01 PM   #7
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I know it is an old thread but if you have a Quad 44 that is operating on one channel check the four or five TL07n opamps on the switching board. There is an electrolytic cap sitting directly next to one of the op amps and if it has spilled it's guts over the opamp it could have damaged the adjacent op amp. This is what happened on a Quad 44 I recently repaired. Replacement of the opamps is a good thing to do in any case, inserting gold plated sockets in place of the old opamps so you can upgrade in the future to OPA627s. BB 134s did suffice for the moment to make it sound very sweet indeed.
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Old 24th July 2011, 09:43 PM   #8
Tajzmaj is offline Tajzmaj  Slovenia
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If you need I have service maanuals for both 34 and 44 here so email me and I will send the pdf.........
taj.pecnikar@gmail.com
Regards to all
Taj
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Old 25th July 2011, 09:52 AM   #9
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Tajzmaj - That is very kind but I have the 44 service manual already.
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Old 25th July 2011, 02:56 PM   #10
Tajzmaj is offline Tajzmaj  Slovenia
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Nice....
Just an offer.
Best regards, Taj
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