Profet Amplifier

Panelhead · 18th June 2005, 05:15 PM

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.

George

nanaud · 13th July 2005, 10:48 AM

Hi,

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, 09:52 PM

It can be found at:

http://www.selectronic.fr/upload/pro...nique/4180.pdf

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, 10:17 PM

rmgvs,

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

Regards,

Jam

fab · 1st August 2005, 12:53 AM

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, 08:51 AM

Hello Jam,

Grand Mos schematic can be found here:

http://perso.wanadoo.fr/francis.audio2/Grand_Mos.jpg

Cheers,
Johan

jacco vermeulen · 2nd September 2005, 11:58 AM

All in one:

http://www.selectronic.fr/includes_s...Revue_son1.pdf

or two:

http://www.selectronic.fr/includes_s...Revue_son2.pdf

Very popular design in France, sounds quite good.

Panelhead · 2nd September 2005, 12:06 PM

Quote:

Originally posted by jacco vermeulen
All in one:

http://www.selectronic.fr/includes_s...Revue_son1.pdf

or two:

http://www.selectronic.fr/includes_s...Revue_son2.pdf

Very popular design in France, sounds quite good.

Jacco,
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.

George

jacco vermeulen · 2nd September 2005, 12:27 PM

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, 07:30 PM

Enormous the file..... oh!

c'a marche!

regards,

Carlos

18th June 2005, 05:15 PM	#1
Panelhead diyAudio Member Join Date: Dec 2002 Location: Houston	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. George

29th July 2005, 09:52 PM	#3
rmgvs diyAudio Member Join Date: Apr 2001 Location: Netherlands	circuit diagram is no problem It can be found at: http://www.selectronic.fr/upload/pro...nique/4180.pdf 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!

1st August 2005, 12:53 AM	#5
fab diyAudio Member Join Date: Mar 2004 Location: Canada	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?

2nd September 2005, 08:51 AM	#6
JohanH diyAudio Member Join Date: Dec 2003 Location: Noord Brabant	Grand Mos schematic Hello Jam, Grand Mos schematic can be found here: http://perso.wanadoo.fr/francis.audio2/Grand_Mos.jpg Cheers, Johan

2nd September 2005, 11:58 AM	#7
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	All in one: http://www.selectronic.fr/includes_s...Revue_son1.pdf or two: http://www.selectronic.fr/includes_s...Revue_son2.pdf Very popular design in France, sounds quite good. __________________ Looks like Sponge Bob has killed another thread.


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13th July 2005, 10:48 AM	#2
nanaud diyAudio Member Join Date: Jun 2004 Location: Lyon / Villeurbanne	Hi, 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

29th July 2005, 10:17 PM	#4
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	rmgvs, Do you have the link for the Grand Mos 100w/ch amp. manual? Regards, Jam

2nd September 2005, 12:27 PM	#9
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	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. __________________ Looks like Sponge Bob has killed another thread.

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