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east electronics 12th June 2012 02:22 PM

Here is an example of an amplifier that eventhough made almost 15 years ago preserve some rules that a lot of people scream about in our forum for many years ( for people that manufacture and construct ) and the amp it shelf sets a level of perfection in amplifier construction .

To my understanding what makes the construction perfect is that the designer had a perfect relation with the pcb and production engineers and set up rules that in no chance should be overlooked .

In the audio history is a common secret that things that designed from grate designers like NP for example when ended up in the production line results was seriously altered and final product was actually compromised by the production engineers or the accountant's office . Adcom i think is one of them but it should be a lot more ...

Important thing is to notice that amplifier achieves superior performance with use of simple material that can be found anywhere without the use of any exotic parts .

down under i will post a few pictures and a few comments on this superior amplifier

here is the general picture , middle 60.000 bank of caps , clever pcb even distribution , less wiring , very clean work with detail and order .

Here is the front board , switcable balanced inputs, ground lift switch , LTP placed a few cm from input RCA , on board you have the first stages of the amp up to the pro drivers area ( very clever since that area is the most clean and most far away from dirty stuff like the psu and output combo zobel /inductor/dumper ) loads of decoupling/bypass for this input stage 100mf +3.3mf+100nf per rail per channel , thermal junction on the LTP , arrays of input capacitors 2.2 mfd X3 times +100nf instead of any exotic capacitor of 6-10mfd less microphonic and much faster ( i think )

Notice also that the manufacturer had the balls to do what is proper IE add decoupling caps down under the board on the input IC hardwired standing on the air to benefit from them as close to IC is possible eventhough this doesn't look in order and neat .

Here is output detail while 8 mosfets form the output while the arrangement is 4 N and 4 P the implementation is N-P-N-P N-P-N-P resulting absolutely even distribution of power among the mosfets but also combined with a vbe multiplier in the middle an amplifier without any chance for any thermal run away

Enjoy the output board with all the dirty stuff on it zobel inductor dumper that of course features separated return to 0Volts in order to keep the amplifier's ground as clean is possible

notice also that all protections of the amp ( deferential overload , dc , thermal , and short circuit) are mostly around optocouplers .

ladies and gents you have enjoyed an audio masterpiece from PERREAUX
THE PERREAUX 350 proudly made in nuclear free New Zealand !!!!

kind regards

east electronics 12th June 2012 02:25 PM

Alvis 12th June 2012 02:29 PM

..but where to the tubes go?

east electronics 12th June 2012 02:34 PM

ha ha ha that was a good one !!!!

Dear Alvis sorry to disappoint you but my goal is to work with amplifiers and after i am finished the expectancy will be 100 years of domestic use so tubes are out of the question from default .

( this is not a joke i have the means to justify it )

happy regards sakis

Bonsai 12th June 2012 02:38 PM

Nicely built amplifier and I have read a lot of good things about them also.

Alvis 12th June 2012 02:39 PM

I am just teasing, seriously, how many gig of RAM does it have?

Bonsai 12th June 2012 02:51 PM


No digits here. This is power analog.

a.wayne 12th June 2012 04:02 PM

Nicely built amplifier , had one for about two weeks ( quickly sold on) , to say it was weak sounding would be an understatement ..

a.wayne 12th June 2012 04:16 PM

To Clarify it was an pmf3150 , many moons ago ....

Tekko 12th June 2012 04:49 PM

This is how amplifiers should be made, big, heavy and needing a engine hoist/fork lift to lift/move them.

None of that plastic featherweight class d crap you see in the stores nowdays.

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