audio analyse' - French made amp?

Williams Audio · 17th January 2010, 03:38 PM

hi,
Audio Analysé is a French company from the 80 - who knows some thing about this amp?
i think that today is metronome-technology, but there is no trace back to it.
it has a very good sound, i am looking for the schematics of the power amp!
best regards,
Williams

forr · 17th January 2010, 05:22 PM

Hi,
This is the only schematics I have.
Audio Analyse amps were class A. Famed in France for excellent sound but very unreliable. Some people incriminate insufficient cooling, I think there could be a thermal cycling problem. If you own one, I suggest you find a way to decrease the power supply voltage.

Williams Audio · 17th January 2010, 07:56 PM

hi forr,
thanks a lot, this amp is very, very hot i think to add some forced ventilation
best regards,
Williams

a.wayne · 17th January 2010, 08:15 PM

Williams ,

How much power is the amplifier ? ...

wahab · 17th January 2010, 08:19 PM

kinda strange thing on the schematic..
the negative feedback is took after the output protection
fuse...if this one blow, the amp will be forced into open loop
configuration..

Nrik · 17th January 2010, 08:54 PM

Quote:

Originally Posted by wahab

kinda strange thing on the schematic..
the negative feedback is took after the output protection
fuse...if this one blow, the amp will be forced into open loop
configuration..

...which probably wont do much harm, since the output then is unloaded.
And the reason for doing so is ofcourse to remove the sonic influence of the fuse.

wahab · 17th January 2010, 09:09 PM

Quote:

Originally Posted by Nrik

...which probably wont do much harm, since the output then is unloaded.
And the reason for doing so is ofcourse to remove the sonic influence of the fuse.

yes, although i woudn t waste negative feedback to correct
a fuse nonlinarity...a relay would be a far better solution, moreover as
this is supposedly an audiophile oriented item...

forr · 17th January 2010, 09:30 PM

Add a resistor of a few hundreds Ohm and enough wattage across the fuse. In case of blown fuse, the feedback loop is maintained, the blown open fuse closed loop gain then having just a little bit more value than the passing fuse closed loop.

Nrik · 17th January 2010, 09:37 PM

Quote:

Originally Posted by forr

Add a resistor of a few hundreds Ohm and enough wattage across the fuse. In case of blown fuse, the feedback loop is maintained, the blown open fuse closed loop gain then having just a little bit more value than the passing fuse closed loop.

...but on the other side of it there is 4-8ohm to ground = circuit is still open looped.

jacco vermeulen · 10:18 PM

The A9 does 60W in Class AB, 50W brochure spec.(Biggy A90 goes 120W, 50 in full Class A)
90W of heat on 160VA toroids in the A9 is pushing it, even if biased only to 25W continuous.

Schematic of the B90/P90 power amp section, 10W Class A and 100 in AB=>

17th January 2010, 03:38 PM	#1
Williams Audio diyAudio Member Join Date: Apr 2004 Location: far away	audio analyse' - French made amp? hi, Audio Analysé is a French company from the 80 - who knows some thing about this amp? i think that today is metronome-technology, but there is no trace back to it. it has a very good sound, i am looking for the schematics of the power amp! best regards, Williams __________________ williams audio

17th January 2010, 07:56 PM	#3
Williams Audio diyAudio Member Join Date: Apr 2004 Location: far away	hi forr, thanks a lot, this amp is very, very hot i think to add some forced ventilation best regards, Williams __________________ williams audio

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17th January 2010, 08:15 PM	#4
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Williams , How much power is the amplifier ? ...

17th January 2010, 08:19 PM	#5
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	kinda strange thing on the schematic.. the negative feedback is took after the output protection fuse...if this one blow, the amp will be forced into open loop configuration..

17th January 2010, 09:30 PM	#8
forr diyAudio Member Join Date: Dec 2004 Location: Next door	Add a resistor of a few hundreds Ohm and enough wattage across the fuse. In case of blown fuse, the feedback loop is maintained, the blown open fuse closed loop gain then having just a little bit more value than the passing fuse closed loop.

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