May 30, 2024 · The schematics is the original Hiraga as in the first picture of the pdf. All the details of the other versions are fully described in the article. Anyone can easily follow and build their own. You have a wide selection of PCBs on the internet to choose from. And there are also offers for GR grade JFETs as well as ALL BJTs.

May 30, 2024 · Hiraga stated the importance of fast current-delivery capability. And most regulators are known to become inductive at high frequencies. So perhaps a capacitor multiplier, a la John Lindsley Hood Class A, is a better choice.

Aug 24, 2002 · For Hiraga, 20..25Volts each rail are good, for "Le Monstre", about 12..14 volts. As the Hiraga and the monster only idle currents in the one amp region, at least for the monster the second Mosfet can be omitted.

Mar 13, 2004 · Jean Hiraga designed a riaa stage based on ECC83 tubes with passive riaa correction between gain stages, not battery operated of course. He designed a MC step-up amp, simplest device ever, to my ears best step-up there is. This is battery operated, 2 lead acid 6V cells 10Ah + 2x 500 000 uF caps.

Feb 24, 2018 · I'm from Brazil and would like to built a Hiraga Le Montre 8W also, and will be very happy if you can show you finished project pictures. Also, how about the sound? Estimado Gonzalo, Soy de Brasil y me gustaría construir un Hiraga Le Montre 8W también, y estaré muy feliz si puede mostrarle las fotos del proyecto terminado.

Jul 6, 2001 · Check his Hiraga page, the schematic is a little different again, he implies he copied the schematic from an original unit purchased second hand. He also thinks its single ended Class A? His "Tangen MPA-30" looks interesting.

Apr 25, 2012 · The Hiraga 20/30W Class A amps using the orginal transistors are still very fine sounding amps. I would not recommend to change the transistor types as long as it is not neccessary, because such class A amp's depends much on their components, as it is the same with Nelson Pass amps etc.

Apr 16, 2017 · Hi again. So today I finished both boards from Jim's audio, I hooked one up to 27 volt, and they work nicely, but, bias is a bit low, I measured 200 mili volt across ballast resistors that's roughly 0.6 amps, I would like it to run a bit hotter, 1-1.5 amps, I attach schematics, I hope any of you can help.

Aug 24, 2002 · 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.

Jan 5, 2023 · Jean Hiraga was the author of several books such as: Les Loudspeakers, (Loudspeakers, 1980, three times re-edited, 5 times reprinted); Initiation aux amplis à tubes (1980, Audio tubes amplifiers initiation, four times re-edited + one edition translated in swedis "Rörforstärkare", 1986). In 1982, Jean Hiraga moved back to Paris.