Hiraga "le monstre"

[hifidaddy]

BTW, anybody detected the error in above FET power supply schematic ??

You get 5 electronics engineering experience points (short 5 EEEP ) for that ;-)

regards,
Hartmut from Munich

[rickpt]

the 2sk30 on the negative power suply is not conected properly...

[hifidaddy]

regards,
Hartmut

[rmgvs]

I did build Hiraga 20 W and Monstre versions for several occasions. As well do I have one original manufactured 20 Watter for almost 15 years now.

The 20/30 Watter to my ears sounds more friendly and tubelike, almost warm. It has a beautiful midrange and a full bottom end and a silky smooth top end. The Monstre has more detail and depth into the music but can sound thin or harsh on occasions (but in its best moments outperforms the 20 W). I also build the Monstre using heavy batteries and 1,5 Farad of buffer: better still but maintaining forementioned peculiarties. I do not agree that the Monstre sounds like a triode single-ended tube amplifier, only in the transparancy of the sound I can see some similarities.

Interesting to know that I have build some cheap versions of the 20 Watter, using a moderate power supply (around 16 Volts DC plus and minus) and using standard 3055/2955, BD139/140 etcetera. Such an amplifier also has a remarkably good sound to it, bettering almost anything commercially available be a good margin. So for a few hunderd Euro's you can build yourself a pretty power amplifier.

[rmgvs]

And I forgot:

I did not build any Pass amplifiers but did have a diy-built version of the later DC single-ended mosfet design (with the big power resistors) that gave around 5 Watts of RMS power.

The sound was not up to my expectations (of course not bad, but way behind the Hiraga) and had a horrible hum in it as well. I do not know about the quality of building and/or used components though and my preamplifier was not up to the task (insensitive and lowish impedance this Pass amplifier). So, not a fair comparison this one.

Rudy

[dhengkoel]

Dear Stefano,

Do you still interest to use the monstre as a car amp? Try following url for the Power Supply: http://sound.westhost.com/project89.htm

Regards:
ragil.hastomo

[Tyimo]

Hello!
I have a strange, a bit stupid question!
Is it possible to create a SE version from the original PP Hiraga Class A (or may be from The Monster) as for example the JE Labs made from the Williamson PP tube amp? ( it could be not the best comparison.....)
I would like to hear the diffrence between the 2 operations and because I am an enthusiast of the SE amps.
Thanks!

P.S.: I built the Monster and it is a realy good amp.......

[ericfe1975]

hello,

after building several class ab an a amplifiers, i have no doubt:

class a is the more natural an sweet sound.

now i want to build "le monstre" but since the transistors of the original schematic doesn't exists anymore, i like to know if some of you have the replacements.

thanks for your answer.

[scottw]

now i want to build "le monstre" but since the transistors of the original schematic doesn't exists anymore, i like to know if some of you have the replacements.

This may be of interest:

http://web.vip.hr/pcb-design.vip/hiraga.html



scottw

[dieter12]

Hi,

based on the original design, here my PCB. Any Commenst ?

regards

Dieter


http://www.oesimayers.de/PCB/Monster_8W_tantal_SP.jpg
http://www.oesimayers.de/PCB/Monster_8W_tantal.jpg