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Old 28th March 2006, 08:22 PM   #1
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Unhappy quad 44 preamp no soun in left side

My quad amp 44 pre amp & 405 main amp, in stereo no left hand side sounds, but in mono both sides, anyone have any ideas what needs fixing
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Old 1st April 2006, 04:52 PM   #2
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Whe you say 'mono', do you mean you select mono mode on your preamp with a front-panel switch?

If both channels work that way, it is clearly not the power amplifier at fault.

It is probably something in the switching or early stages of your preamp, but signal tracing with a scope or meter is going to have to be done to isolate it.
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Old 2nd April 2006, 04:53 PM   #3
anatech is offline anatech  Canada
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Hi jollyrogernl,
Arrr matey! There be bad solder joints on the main PCB in the 44. Resolder all the leads from one side of the board to the other. There may be other issues but I can't remember all of the service note off hand.

-Chris
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Old 2nd April 2006, 05:43 PM   #4
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I repaired one the other year, the fault was electrolytics in the preamp, they had leaked electrolyte and corroded the PCB tracks. Cleaning the board, replacing the electrolytics, and repairing the damaged tracks cured it.
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Nigel Goodwin
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Old 2nd April 2006, 06:24 PM   #5
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Default Thanks Matey

Avast me matey,
Tanks a million dubloons for yer welcome advise
Till we sail again,

Ta ta
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Old 2nd April 2006, 06:26 PM   #6
anatech is offline anatech  Canada
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Hey Nigel,
Thanks for refreshing my memory. I think there was also something about changing chips, or defective chips.

Old memories.

-Chris
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Old 2nd April 2006, 06:42 PM   #7
Zombie is offline Zombie  Sweden
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There's a 44 service manual on the 'quadhifi' group at www.yahoogroups.com
If it works in mono and not in stereo, it might be some dead 4066 switches...
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Old 2nd April 2006, 06:51 PM   #8
anatech is offline anatech  Canada
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Hi Zombie,
Now that makes sense. I believe they were replacing 4066 with 4966. That's the same chip pinout but a higher voltage rating. Could be wrong, but something was tugging at my mind.

-Chris
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Old 3rd April 2006, 01:35 PM   #9
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Default quad 44

Thanks Guys
Thats great info,

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