DIY Audio Projects Forum

Jean Hiraga "Le Monster"
Page 1 of 1

Author:  mwhouston [ 15 Feb 2018, 20:47 ]
Post subject:  Jean Hiraga "Le Monster"

I thought I may have started a thread with this amp but can't find it. I populated the Hiraga brds. 20years ago but then they just sat around. Amps now finished. Meant produce 8W of pure class A and is a DC amp. Only four stages. A couple of FETs split the signal then each side amps one half.

Only 80,000uf of storage where many farads are suggested. On my 19ltr 2-ways and sounds great. Stacks of low forceful bass and fully-sick-3D soundstage. Needs a few days burn in but already very enjoyable.

Author:  Gio [ 15 Feb 2018, 21:00 ]
Post subject:  Re: Jean Hiraga "Le Monster"

Good work Mark. I'm glad I'm not the only one who has populated boards sitting around unused.

Schematic and pcb from original Le Monstre article are here: ... e-Monstre/

Author:  laurie54 [ 16 Feb 2018, 02:30 ]
Post subject:  Re: Jean Hiraga "Le Monster"

I have built and use two of these amps. One for my tweeters and the other is for background spkrs. I loved them from the first i heard them. And i was lucky enough to get 20 each of the original 2SK170 and 2SJ74 at a cost of $20.Can. Shortly after they disappeared and then showed up in places for amounts like $46. for one set of 2 x 2SK170's. Then the knock offs. Gees hard to keep track but they are slowly being found / manufactured again. TG! The 2SK170 is very popular.

Author:  mwhouston [ 16 Feb 2018, 05:21 ]
Post subject:  Re: Jean Hiraga "Le Monster"

I have a number of 2SK170s.

Author:  laurie54 [ 16 Feb 2018, 13:38 ]
Post subject:  Re: Jean Hiraga "Le Monster"

The 2SK170 are popular in many projects. On another note Mark, if i find it, i have a phono preamp that used, I think 12 BJT trans for the front end (per chnl). It is dead quiet. I also built the JFET RIAA phono pre that you built with batteries for supply. Both pre's are dead quiet but i didn't have the time to A/B the two types as far as sounding but both work as well as the other. I moved and they are now in boxes,,,,,somewhere here.

Author:  mwhouston [ 16 Feb 2018, 17:29 ]
Post subject:  Re: Jean Hiraga "Le Monster"

All my Le Pacific and Boozehound MC stages use this FET.

Author:  mwhouston [ 25 Feb 2018, 17:50 ]
Post subject:  Re: Jean Hiraga "Le Monster"

All finished. Had awful problems with the PS and then getting DC offset down but all good now. I have been enjoying this amp for over a week and find it very natural as did a friend on his gear. Relaxed sound with good solid bass and balanced mids to treble. There is some nice warmth in the mids which I think helps with the relax feel this amp exudes. Most happy but even happier to sell it on to fund next projects.
P2253673 (800x600).jpg
P2193670 (800x600).jpg
P2253674 (800x600).jpg

Page 1 of 1 All times are UTC - 6 hours [ DST ]
Powered by phpBB® Forum Software © phpBB Group