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Old 6th December 2003, 10:28 AM   #1
ManUtd is offline ManUtd  Norway
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Default Electrocompaniet AW-100DM

Hi There,

Got an old version of AW-100DM from 1986.
One channel is defective and the other one has been repaired
with new transistors,diodes,electrolyts.
I now need to know the bias adjustment of this amp.
On working channel i can measure approx. 2mV DC across emittor
resistor in Outputstage.

Supply voltage for AW100 is +-42VDC for outputstage.

Picture shown is for AW65,but is almost same AW100 has more
outputtransistors.

Is 2mV a normal Bias voltage for this circuit?

Thanks for any helps.

ManUtd
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Old 6th December 2003, 10:45 AM   #2
ManUtd is offline ManUtd  Norway
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To bad picture,sorry.
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Old 6th December 2003, 11:50 AM   #3
Rambi is offline Rambi  Netherlands
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Default Re: Electrocompaniet AW-100DM

Quote:
Originally posted by ManUtd

...
Is 2mV a normal Bias voltage for this circuit?
...
If the emitter resistors are 0.2 ohm (I can barely determine that from the picture) then 2mV is about 10mA. In this kind of circuit I would expect something like 100mA (20mV).
I don't know/have this amplifier, so maybe someone else (who does) can confirm this?

Remco
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Old 6th December 2003, 12:33 PM   #4
ManUtd is offline ManUtd  Norway
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Thanks for your reply.
Yes,unfortunately picture is of bad quality.
Resistors are 0,2R and 3watt +-5%
When it is cold i measure 0,5mV and when it gets
hot i measure about 2mV.
This is measured on the one that is working and gets "normal hot" after
some 1/2 - 1 hour usage.

ManUtd.
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Old 2nd January 2004, 04:19 PM   #5
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ManUtd, do you have a better picture?

If so can you send it at andrea.pirovano@libero.it ?

Thank you

Andrea
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Old 3rd January 2004, 01:19 AM   #6
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Default Re: Re: Electrocompaniet AW-100DM

Quote:
Originally posted by Rambi


If the emitter resistors are 0.2 ohm (I can barely determine that from the picture) then 2mV is about 10mA. In this kind of circuit I would expect something like 100mA (20mV).
I don't know/have this amplifier, so maybe someone else (who does) can confirm this?

Remco
I too would expect the 100 mA / device number after
warmup, which is about 20 mV across .2 ohm.
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Old 30th October 2008, 02:21 PM   #7
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Thank You, ManUtd!

I have an amp just like that where the left channel is frying bacon at me. It works fine for a few minutes, then it starts to misbehave.
This will definitely make it easier to find the fault.

Anyone with suggestions as to what might be wrong?
I have just recapped the whole thing, and the rying remains, so I suspect one or more of tge active components.
On the other hand am I no electronics wiz :-).


Regards/Beachmountain
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Old 30th October 2008, 11:40 PM   #8
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What amp do you have??? Im not so sure the amp in the first post is a electrocompaniet, never seen a schematic of that company that even resembles that one.
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Old 31st October 2008, 12:39 PM   #9
ManUtd is offline ManUtd  Norway
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Smile Schematis

I got the copy directly from E.C so it is deftinately a original.
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Old 31st October 2008, 12:44 PM   #10
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And identical to the schematic of the Audiowire 65 that Mr Pairo used to have on his homepage.

The Norwegians seemed to have a thing for fast NEC output devices.
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