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Panelhead 18th June 2005 04:15 PM

Profet Amplifier
Saw the nice ad for the Profet amplifier in AudioXpress. Surfing around read that there is review coming.
This circuit looks extremely simple. Couple transistors, resistors, pots. The 23 dB gain is about the only downside.
Does anyone have experiance listening to this? I also read where a complete kit is available for 800.00 for the 15 watt stereo model.
This is very reasonable. But I already have everything to build one except a circuit diagram. I can build it at almost zero cost.
Saw the parts list on the Selectronic forum, wish I knew how to connect the dots.
The nice review on the website did not convert to english with babelfish. I wonder what Jean Hiraga had to say.


nanaud 13th July 2005 09:48 AM


If you have the schemes + component list, please share.

If you would any translation from french to english, post it also, I would enjoy do it, even if my english is not so good, a human's better than a fish !!! :P

rmgvs 29th July 2005 08:52 PM

circuit diagram is no problem
It can be found at:

I also am curious about experiences with the sound of it. It can be built for reasonable costs, a pcb is not required.

Reading the instructrions I wonder what use are the use of 2 trimpots. I looks like one is for the offset regulation and the other for the current regulation. This seems not logical to me: one pot could do for the offset and the current can be set by changing the 1k resistors (like in the Le Monstre design of Jean Hiraga).

Please comment, because I am not sure.

Be aware that the instruction in pdf format is about 45 Mb!

jam 29th July 2005 09:17 PM


Do you have the link for the Grand Mos 100w/ch amp. manual?



fab 31st July 2005 11:53 PM

Profet Grand mos really Class A ?
I have read the doc on the Grand mos. It says to be "pure class A" at 16 WRMS for 8 ohms. From my calculations, it takes 1 A bias current for class A but the doc indicates to adjust it to about 260 mA. Thus, is there something I get wrong or is this false advertisement about class A?

JohanH 2nd September 2005 07:51 AM

Grand Mos schematic
Hello Jam,

Grand Mos schematic can be found here:


jacco vermeulen 2nd September 2005 10:58 AM

All in one:

or two:

Very popular design in France, sounds quite good.

Panelhead 2nd September 2005 11:06 AM

Wrong amp

Originally posted by jacco vermeulen
All in one:

or two:

Very popular design in France, sounds quite good.

Those are the 100 watt Gran Mos. The Profet is a 25 watt, much simpler model.
The Profet uses an opamp input, a 2K170, 2SJ74 pair, and a pair of lateral mosfets. I can figure out the discrete, have no idea on the use of the opamp.


jacco vermeulen 2nd September 2005 11:27 AM

afaik, the Grand Mos Profet circuitry is the same as the one for the Triphon.
The Profet kit comes with RCA and balanced XLR entry, for balanced entry you need the opamp.

destroyer X 2nd September 2005 06:30 PM

Ufa!...i am already downloading!.... my God!
2 Attachment(s)
Enormous the file..... oh!

c'a marche!



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