The Class-A Amplifier Site
This page was last updated on 19 July 2004
Jean Hiraga Class-A Amplifiers
The following two designs by Jean Hiraga were originally published in the French magazine “l’Audiophile”. They have a good reputation for sound quality, but this is not an aspect I have been able to verify personally. Unfortunately, I am unable to offer any support for these designs since I have yet to build either of them, but if anyone else has useful information relating to these amplifiers, for example transistor substitutes, please let me have the details and I will add them to the ‘Additional Information’ page.
It now seems unlikely that I will ever get round to completing the translation of the articles, due to ill-health and other priorities, so I have added copies of the original articles for the benefit of anyone who can read French. For those who can’t read French, approximate (machine generated) translations of sections of the articles can be obtained using the on-line facilities at SYSTRAN.
My thanks go to Rudy van Stratum for sending me copies of the Hiraga 20W Parts 1 and 2, to Scott Nixon for the Hiraga 20W Part 3 (and to Jam Somasundram for arranging this) and to Mike Jonasson for the copies of the ‘Monster’ articles. I would also like to thank Miroslav Vujica for supplying a draft translation of the 20W Class-A Part 1 article.
Index
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The 20W Class-A
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Last Updated |
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7 August 2001 |
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8 August 2001 |
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Part 3 – La version définitive
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1 August 2001 |
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Part 1 – General design (l’Audiophile No. 10)
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19 July 2004 |
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Part 2 – Construction (l’Audiophile No. 11)
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9 August 2001 |
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Part 3 – The final version (l’Audiophile No. 15)
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19 July 2001 |
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The Monster
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Amplificateurs classe A 8 watts « Le monstre »
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1 August 2001 |
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Amplificateurs 8 W « Le monstre » L’alimentation
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1 August 2001 |
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Retour sur le 8 W « Le monstre »
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1 August 2001 |
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Class A Amplifier 8 watts "Le monstre" (The Monster)
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November 2012 |
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The Monster - Power Supply (l’Audiophile No. 29)
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November 2012 |
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‘The Monster’ Revisited (l’Audiophile No. 31)
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16 July 2001 |
HISTORY: Page created 05/07/2001
10/07/2001 20W Class-A split into 3 parts
12/07/2001 Figures added to all articles
14/07/2001 Text added to Hiraga 20W Part 3 article
16/07/2001 Text added to Return to the Monster page. Minor corrections to Hiraga 20W Part 3 article
19/07/2001 Figures 4 and 5 added to Hiraga 20W Part 3 article. Figure 10 moved to separate page
01/08/2001 Original articles for the 20W Class-A Part 3 and ‘The Monster’ added
07/08/2001 Original article for the 20W Class-A Part 1 added
08/08/2001 Original article for the 20W Class-A Part 2 added
09/08/2001 Translation of 20W Class-A article Part 2 added
14/11/2001 Transistor Substitutes page added
27/04/2004 Transistor Substitutes page deleted
19/07/2004 Translation of 20W Class-A article Part 1 added