Hiraga "le monstre"

Stefano · 24th August 2002, 07:56 PM

Hi all you folks, i ask for your competence for the Hiraga amp "the monster" that seems to me to be a interesting and simple amp. As anyone of you ever builded it? I'm interested to study a mosfet version to use it as car amp to economize to PSU. Any comment is welcome.

jazz · 24th August 2002, 10:12 PM

stefano,

I've built this amp and i think it is very good. I don't know about a car amp though, it draws quite a bit of current Anyway if you do want to build it here's some tips: If you built this please be sure to bypass the biasing circuit of the input cascode with some good caps (or give it a really good regulator), this makes it sound quite a lot better. This is a very fast amp and to my experinece it is best to give it a psu that is build up with a large number of smaller caps in stead of one large one, a pi filter works very well and series resistance in front of the rectifier (0.33/47 OHMs) will do good as well. In the case of the mosfet version please have a look at goeff's excellent website. He has got the original articles printed there and hiraga did look at mosfets as well, there's a pcb layout to.

greetings, Joris

planet10 · 25th August 2002, 02:42 AM

Quote:

Originally posted by jazz
goeff's excellent website. He has got the original articles printed there and hiraga did look at mosfets as well, there's a pcb layout to.

URL?

dave

Freddie · 25th August 2002, 08:46 AM

Quote:

URL?

http://www.gmweb.btinternet.co.uk

planet10 · 25th August 2002, 09:07 AM

Thanx. A lot of interesting stuff there.

dave

FrankDIY · 25th August 2002, 01:29 PM

Very cool article on the Musical Fidelity A1

carlmart · 25th August 2002, 02:50 PM

François,

Which article on the A1 you mean? There's only the A1's circuit at Geoff's site.

Or you mean the link at Mark Hennessy’s site? His is really an excellent comment on the A1.

Carlos

hifidaddy · 25th August 2002, 10:01 PM

Hi,

here in Munich a lot of guys had built these around 1990, as well as the pure bipolar version "Le Classe A".

Personally, I prefer the "Le Classe A", for it does the PRAT (pace, ryhtm, and timing) thing much better, in a way otherwise Naim does. "Le Monstre" OTOH is smoother in the mid to treble region, sounding more "High End Stereo".

Where the Monster excells, is when driving 100dB horn speakers. It can be viewed as a viable alternative to a single ended triode design.

regards,
Hartmut from Munich

FrankDIY · 25th August 2002, 11:28 PM

Quote:

Originally posted by carlmart
François,

Which article on the A1 you mean? There's only the A1's circuit at Geoff's site.

Or you mean the link at Mark Hennessy’s site? His is really an excellent comment on the A1.

Carlos

Mark's article.
Sorry for the confusion.

NU_NRG · 26th August 2002, 03:14 AM

Someone here know where we could find pictures of this amplifier?

24th August 2002, 07:56 PM	#1
Stefano diyAudio Member Join Date: Jun 2002 Location: Cagliari, Sardinia	Hiraga "le monstre" Hi all you folks, i ask for your competence for the Hiraga amp "the monster" that seems to me to be a interesting and simple amp. As anyone of you ever builded it? I'm interested to study a mosfet version to use it as car amp to economize to PSU. Any comment is welcome. __________________ Let's make something special

24th August 2002, 10:12 PM	#2
jazz diyAudio Member Join Date: Dec 2001 Location: leiden, physically that is...	stefano, I've built this amp and i think it is very good. I don't know about a car amp though, it draws quite a bit of current Anyway if you do want to build it here's some tips: If you built this please be sure to bypass the biasing circuit of the input cascode with some good caps (or give it a really good regulator), this makes it sound quite a lot better. This is a very fast amp and to my experinece it is best to give it a psu that is build up with a large number of smaller caps in stead of one large one, a pi filter works very well and series resistance in front of the rectifier (0.33/47 OHMs) will do good as well. In the case of the mosfet version please have a look at goeff's excellent website. He has got the original articles printed there and hiraga did look at mosfets as well, there's a pcb layout to. greetings, Joris __________________ oh, what a beautifull day I wanna go out and play!

25th August 2002, 09:07 AM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 3	Thanx. A lot of interesting stuff there. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi

25th August 2002, 01:29 PM	#6
FrankDIY diyAudio Member Join Date: Mar 2001 Location: Montreal	Very cool article on the Musical Fidelity A1 __________________ Imagination is more important than knowledge. Knowledge is limited; imagination encircles the world. Albert Einstein FrankDIY's Audio Corner

25th August 2002, 10:01 PM	#8
hifidaddy diyAudio Member Join Date: Oct 2001 Location: Munich, Germany	Hiraga "Le Monstre" Hi, here in Munich a lot of guys had built these around 1990, as well as the pure bipolar version "Le Classe A". Personally, I prefer the "Le Classe A", for it does the PRAT (pace, ryhtm, and timing) thing much better, in a way otherwise Naim does. "Le Monstre" OTOH is smoother in the mid to treble region, sounding more "High End Stereo". Where the Monster excells, is when driving 100dB horn speakers. It can be viewed as a viable alternative to a single ended triode design. regards, Hartmut from Munich


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25th August 2002, 02:50 PM	#7
carlmart diyAudio Member Join Date: Mar 2001 Location: Brazil	François, Which article on the A1 you mean? There's only the A1's circuit at Geoff's site. Or you mean the link at Mark Hennessy’s site? His is really an excellent comment on the A1. Carlos

26th August 2002, 03:14 AM	#10
NU_NRG diyAudio Member Join Date: Dec 2001 Location: Quebec, CANADA	Someone here know where we could find pictures of this amplifier?

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