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Old 28th March 2006, 10:39 AM   #1
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Default Electrocompaniet AW65 Help request

Hello all
Could anyone, please, give me some clarity on this issue ?

The schematics is for the Input Stage only of the AW65.

Power Supply is -+47Volts.

The offset measured at OUT drifts with temperature from - 10Volts to +3Volt after 2 minutes.

The temp of Q8-Q9 reaches 63ºC.

The calculated current on Q9 (Vce 36V) collector is 23mA for a dissipation of 800 mW.

Does it all make sense ?

I have doubts that the offset should drift so much.

I heard that Electrocompaniet amps dissipate a lot of heat, maybe that's why the fault on this amp destroyed so many transistors, they work at such Hi Temp.

Many Thanks

Rollo
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Old 28th March 2006, 11:04 AM   #2
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Hi Rollo,
IIRC the AW65 has a separate protection-servo board.

Do you have a photo of your unit?
I once have fixed a wannabe-AW65 (but more likely a mixup between different EC models)

Ciao

Andrea
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Old 28th March 2006, 02:45 PM   #3
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Here it is
Please tell me all the dilfferences you see.
I think the big blue caps are not original.
There are some Transistors missing for now.
Ciao
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Old 28th March 2006, 02:58 PM   #4
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Hi,
you can check the one I have here Electrocompaniet Help

Btw you seem to miss the protection / servo boards... the photos I made show that these are marked "AW-65"... let me guess... does your amp come from a "official" EC repairer in Meda?

If so both you and my friend (the owner of the amp) have ben screwed by the same guy....

Cheers

Andrea
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Old 28th March 2006, 04:08 PM   #5
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Q8 should be NPN
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Old 28th March 2006, 04:31 PM   #6
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Hi
there is a marking AW behind the finals and pp on lower right.

No, I bought it from a guy in Switzerland.

Have you got a photo of the servo board with connections to the amp board ?
even if you made it.

Thanks

Rollo
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Old 28th March 2006, 04:32 PM   #7
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and this
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Old 28th March 2006, 04:33 PM   #8
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I suppose the original MT200 Toshiba output devices are blown too ?
The original electrolytics were Roedersteins, these looke like Philips or Sprague.
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Old 28th March 2006, 04:36 PM   #9
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Yes it is the same as Q9, my mistake (the model is the same though).

as and finally...
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Old 28th March 2006, 04:53 PM   #10
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Here's the right drawing, I hope...

Rollo
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