With this power, the rate of distortion reaches practically 1%. Jean hiraga classa amplifiers the following two designs by jean hiraga were originally published in the french magazine laudiophile. What strikes me the most is the ability of this amplifier to differentiate between instruments and noises in the sound stage. This amplifier is the le monstre version that can deliver 8 to 15w of pure class a amplification at uncompromised sound performance. The ideas expressed herein are the opinions of the author expressed under his first amendment rights and therefore their value and truth should be determined by the readers for themselves. This page was last updated on 16 july 2001 back to index the monster revisited. A very simple design where each element has to be chosen with extreme care. Amplifier schematic diagrams software free download. In 1985 jean hiraga wrote an article in two parts presenting, among other things, a design for a very simple mosfet amplifer called the nemesis. It been driving my tannoys with ease while the arc was in the hospital.
Jean hiragas super classa 30w amplifier schematic and pcb i used the original board layout shown in the magazine article figure 1 as well as the original driver transistors. Due to the scarcity of 2sj74 pchannel jfet, and the announcement of obsolete of 2sk170 nchannel jfet recently, we inevitably have to rise the price of the kit. Honestly some amp excelled in some area but overall the 20w had a better sound. Hiraga kaneda solid state preamp with phono mm classifieds. I will open it up and check it out tomorrow on my day off. This amplifier was original built into an old car amplifier chassis using the original 12v to 24v smps.
Due to a much better power margin, thermal drift of resistance due to temperature variation is minimized. This uses the original transistors except the output transistors which are newer mjlmjwtypes but the. Jean hiraga 12ax7 ecc83 singleended kt88 tube amplifier schematic jean hiraga s singleended kt88 tube amplifier schematic with 12ax7 ecc83 tube input stage. The modification ended up taking 4 days instead of the 4 hours i. Schematic by jean hiraga described in laudiophile, a disappeared highend french revue. The hiraga produces quite a bit heat so an appropiate heatsink is very important. One can make all progress which one wishes in the field of electroacoustics, it will nevertheless remain that all these systems always return to an impossibility. Hiraga is probably most known for his le monstre design a small 8w class a amplifier and for his use of massive amounts of capacitance in the power supplies. A build of jean hiragas 20w classa amplifier project using current. Schematic diagram of a simple 7 watt audio amplifier using tda2003 amplifier ic. Power hiraga power supply for the le monstre amplifier.
Jean hiraga classa amplifier new fifth 5 individual project part two final. Mount the main rectifier bridge d4 on the bottom side of the pcb as shown in the layout drawing. Internally there are bitumen and felt liners, a cross brace with strategic tuning slots and a downfiring port thats slotloaded into the integral plinth. Thats the only solid state product i use, and only because tubes are to noisy at such low levels. The hifisonix kxamplifier is a 28 watt class a diy current feedback cfa power amplifier featuring low. The design is with reference to the legendary design by jean hiraga. Jul 02, 2015 sound jean hiragas classa 8w amplifier you will be very pleased with the sonic results of this amplifier. Jul 19, 2001 construction of a 20w class a amplifier. It is the simplest of circuits should anything go wrong. Arch nemesis by nelson pass introduction a poster of einstein once said, things should be made a simple as possible. We offer you for the hiraga amp 20w serveral kits and materials. This explains the ability of the 20w amplifier described here, to hold the bass region of the onken enclosure, in spite of a fairly poor damping factor.
Jean hiragas super classa amplifier diyaudioprojects. After building and listening to jean hiragas le monstre, a 8w classa amplifier, i wanted to build le monstres bigger brother the 20w class a amplifier. Having all these almost ideal characteristics this amplifier is likely to become the basic building block of your future. A build of jean hiragas 20w classa amplifier project using current production. Sound jean hiragas classa 8w amplifier you will be very pleased with the sonic results of this amplifier. Feel free to send us your hifi audio schematics and we will add them here. At the present time it is difficult to find diagrams of high quality class a amplifiers, moreover, the circuit described offers many benefits, in particular a great simplicity of construction. This is a kit of class a amplifier with ultrafi sonic quality. On the onken bass enclosure, the impedance goes up to nearly 70 ohm, between 15hz and 50hz. The biggest collection of hiraga manuals and schematics. As youd expect, image outline sharpness with the big 15inchers was less acute than over the albedos which i had hiraga listen to for a few tracks to help him acquire a baseline impression of the room and system. What strikes the most is the ability of this amplifier to differentiate between instruments and noises in the sound stage. Hiraga manuals, schematics and brochures hifi manuals. With the exception of the output transistors and their driver transistors, this diagram can be remade starting with other transistors of european.
One can make all progress which one wishes in the field of electroacoustics, it will nevertheless remain that all these systems always return to an. We offer you for all designes serveral kits and materials. Having read jean hiragas article construction of a 20w classa amplifier and in copies of the old french magazine laudiophile, i was interested to hear for myself how le monstres bigger brother. If you have built any of these circuits, we would love to hear from you so send us your comments. However, most interesting in a circuit is not the circuit itself, but its. For this circuit, this accommodation constitutes a practical. Steves do it yourself electrostatic headphones project. Mar 29, 2018 hiraga 20w classa amplifier re working posted on march 29, 2018 march 29, 2018 by rixsta this amplifier was original built into an old car amplifier chassis using the original 12v to 24v smps. Jean hiraga super 30w classa amplifier schematic and pcb.
Ive build several hiraga s 20 watt amplifiers and le monstres too. Le classe a diy jean hiraga super 30w class a amplifier. Diy hiraga 20watts class a amplifier for sale canuck audio mart. With a number of different kt88 tube amplifiers we have had good results using new production jj kt88 blue glass and genalex gold lion kt88 tubes. The 20 watter is one of the best transistor amplifiers in the world, the sound is very smooth and airy, almost tubelike. Mono and stereo is a magazine in continuous evolution, frequently delivering content most relevant to our readers. Amplifier schematic diagrams, free amplifier schematic diagrams software downloads, page 3. Jean hiragas singleended kt88 tube amplifier schematic with 12ax7 ecc83 tube input stage. What transistors did you use in that build the original schematic looks to specify y grade 2sk170j74 which arent exactly easy to source. Even using fairly standard 3 way speakers in a large room, surprisingly there is ample power. As the schematic reveals, there is a lot of opportunity to play around. After deciding that the heat sink was not adequate enough for a classa amplifier i decided to remod the whole thing. Subtitled an homage to the we 25 b, the piece celebrated classic simplicity in amplifier design, specifically a western electric amplifier that used a single gain triode. This ic is a upgrade version of tda 2002 amplifier ic.
The red monstre is built on a set of pcbs from ebay seller jimsaudio. Does somebody can tell me which psu is adequate for 20w hiraga. I tested the power supply which you may recognize as the pcb for the john linsleyhood simple class a amplifier 1996 version from williams hart electronics. Hiraga kaneda solid state preamp with phono mm location. It is precisely in these regions that the amplifier must best control the loudspeaker. The design is with reference to the legendary design by jean hiraga published in laudiophile. Jean hiraga s super classa 30w amplifier schematic and pcb i used the original board layout shown in the magazine article figure 1 as well as the original driver transistors.
As mentioned in my short hiragapost a while ago, i have also been trying my hand at hiragas le monstre design. Jean hiragas super classa amplifier diy audio projects. This is a set of two pieces of pcb of a stereo class a amplifier with ultrafi sonic quality. Kakav sam, naopak, prvo sam napravio slozenije pojacalo vece snage pa tek onda jednostavnije i slabije.
Its quite a rare beast, is big, heavy, class a but doesnt cook the room. This is then often taken to even more extreme levels by audiophiles of today that can get large capacitors relatively cheaply compared to the cost in the seventies when the. Found 200 records in search of high efficiency speaker asylum 1. Hiragas now available creation is an oldfashioned broadshouldered big box in butcherblocked 30mm solid beech dress and a plethora of unsightly screws around back. To further improve the robustness and thermal stability of the amplifier, we put in 12w. Based on some customer feedback, we have change the collect resistors to noninductive 1 ohm 5w type. The monstre is a simple 8w class a amplifier that originally ran off a huge 12v battery supply. We offer several kits of different designes based on the genius designes jean hiraga has done. The classa amplifier site hiraga 20w classa elliott sound. It was apparently created as the demo amp for a certain speaker manufacturer hence the expolinear badge. Jun 09, 2019 nice work there, have you got any experience of the super class a hiraga.
Jean hiraga super class a amplifier our stefano bertoncello is building a hand made clone of the jean hiragas 20w super classa amplifier. This is our collection of diy and hifi audio schematics. This kit have everything what you need to make your own a class 30w amplifier. General description this is an exceptionally well designed amplifier, with a lot of power reserve, high fidelity, low distortion, good sn ratio, high sensitivity, low consumption and full protection. Jean hiragas 20 w class a design became something of a cult amplifier in the 1980s in the audio community and constructors from europe, australia, japan and the usa praised its sonic performance. Internally there are bitumen and felt liners, a cross brace with strategic tuning slots and a down. Jean hiraga super class a amplifier mono and stereo. However, due to the unavailability of the original power transistors, i opted for a more robust output stage using toshiba 2sa1943 and 2sc5200 complimentary. The amplifier is called super 30w class a which implies it can gives 30w of power with operation in class a. Ovaj projekat je trebao da bude pokazna vezba kako sa sto manje novca, bez preterivanja, napraviti pojacalo a klase koje pristojno zvuci. I had it directly against the hiraga monster, the gainclone and the pass f5 and liked the 20 watts better. Jean hiragas super classa amplifier 30 watt classa sony vfet output. Power hiraga power supply for the le monstre amplifier pcb. Please be carefull with those devices due to high voltage loaded inside the capacitors.
This is a good ic with many built in features like low harmonic distortion, short circuit protection,thermal overload protection etc. Ive build several hiragas 20 watt amplifiers and le monstres too. The original transistors used by hiraga are no longer available. March 16, 2018 by bonsai in amplifiers, power amplifiers. Sep 02, 2014 jean hiraga s super classa amplifier 30 watt classa sony vfet output. Jean hiraga 12ax7 ecc83 singleended kt88 tube amplifier. A tube amplifier for electrostatic headphone based on a schematic from stax julyaugust 1993 pages 58 to 66. Hiraga 20w classa amplifier reworking riki buckingham. They have a good reputation for sound quality, but this is not an aspect i have been able to verify personally. Ivex software free demo of their pcb and schematic software bbyists. A very high performance 28 watt class a current feedback amplifier.
Jean hiragas super classa amplifier electronics infoline. I am very pleased with the sonic results of this amplifier. In 1985 jean hiraga wrote an article in two parts presenting, among other. Jul 08, 2016 jean hiraga classa amplifier new fifth 5 individual project part two final. I bought this from jake the last year as a standby amp, but need funds. Hiraga s now available creation is an oldfashioned broadshouldered big box in butcherblocked 30mm solid beech dress and a plethora of unsightly screws around back.
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