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Old 17th January 2010, 03:38 PM   #1
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Default 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
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Old 17th January 2010, 05:22 PM   #2
forr is offline forr  France
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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.
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Old 17th January 2010, 07:56 PM   #3
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hi forr,
thanks a lot, this amp is very, very hot i think to add some forced ventilation
best regards,
Williams
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Old 17th January 2010, 08:15 PM   #4
a.wayne is offline a.wayne  United States
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Williams ,

How much power is the amplifier ? ...
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Old 17th January 2010, 08:19 PM   #5
wahab is offline wahab  Algeria
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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..
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Old 17th January 2010, 08:54 PM   #6
Nrik is offline Nrik  Denmark
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Originally Posted by wahab View Post
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.
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Old 17th January 2010, 09:09 PM   #7
wahab is offline wahab  Algeria
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Originally Posted by Nrik View Post
...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...
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Old 17th January 2010, 09:30 PM   #8
forr is offline forr  France
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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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Old 17th January 2010, 09:37 PM   #9
Nrik is offline Nrik  Denmark
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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.
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Old 17th January 2010, 10:16 PM   #10
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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=>
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