HIRAGA LE CLASS A 30 W

[inertial]

HI,

my wonderful amp has - i suppose - melted power transistors.
Anyone is so kind to post the complete schematic of this fantastic amp?

Very Thanks for reading

Cheers,

Paolo ,
Venezia - ITALY

Phaseless Speakers

 

[JohanH]

Jean Hiraga's Super Class-A Amplifier

 

[Zen Mod]

The Class-A Amplifier Site

 

[JohanH]

The Class-A Amplifier Site

Hello Zen Mod,

almost forgot about that one.
One of my first resources on Hiraga.
Unfortunately it doesn't list the 30W version (AFAIK)

Cheers,
Johan

 

[tvi]

I think you need this page

On en parle n°34 : modifs ampli Hiraga 20W, tweeter technics 5HH10 ...

 

[jeepy]

Output pair is TOS 2sd718-2sb688 (NPN/ black and PNP/green)

HI,

my wonderful amp has - i suppose - melted power transistors.
Anyone is so kind to post the complete schematic of this fantastic amp?

Very Thanks for reading

Cheers,

Paolo ,
Venezia - ITALY

Phaseless Speakers

 

[inertial]

I am very happy! You are very kind!
Thanks all!

 

[JohanH]

I am very happy! You are very kind!
Thanks all!

Well, this was the easy part. AFAIK these transistors are very difficult to find

 

[Williams Audio]

Hi all,
I just built a 30w super hiraga
Is working fine and very good sound
Huge power supply and big heat sinks
If some one is interested on more details I am here to help
Best regards,
Williams

 

[MEGA_amp]

Hi all,
I just built a 30w super hiraga
Is working fine and very good sound
Huge power supply and big heat sinks
If some one is interested on more details I am here to help
Best regards,
Williams

Would it be possible to post pics?.......LOTS!!

 

[iaxxaxxai]

Would it be possible to post pics?.......LOTS!!

You can see it here:
http://www.diyaudio.com/forums/solid-state/5462-hiraga-le-monstre-93.html

 

[jeepy]

Note: If you have efficient speakers (min. 92db) the 20W version (the original one) will allow you to cut by two the price of the capacitors!
Per rail: 68 000 + resistor + 330 000 + 330 000 for the 30W
Per rail: 33 to 47 000 + resistor + 68 000 + 68 000 for the 20W
Transformer = 400VA for the 30 W(+/-24V DC) , 300 VA for the 20W (+/- 21V DC)
Also be aware that with 1 Amp bias and 21-24 v, The first cap will receive PDC (pulsed direct current) pics of 30 to 40 amperes. Diode rectifiers should be dimensionned accordingly and first cap should not be low ESR, with lower value than the second stage.
The Power supply is critical with this simplistic design! You are welcome if you need further details!

HI,

my wonderful amp has - i suppose - melted power transistors.
Anyone is so kind to post the complete schematic of this fantastic amp?

Very Thanks for reading

Cheers,

Paolo ,
Venezia - ITALY

Phaseless Speakers

 

[jeepy]

Note: If you have efficient speakers (min. 92db) the 20W version (the original one) will allow you to cut by two the price of the capacitors!
Per rail: 68 000 + resistor + 330 000 + 330 000 for the 30W
Per rail: 33 to 47 000 + resistor + 68 000 + 68 000 for the 20W
Transformer = 400VA for the 30 W(+/-24V DC) , 300 VA for the 20W (+/- 21V DC)
Also be aware that with 1 Amp bias and 21-24 v, The first cap will receive PDC (pulsed direct current) pics of 30 to 40 amperes. Diode rectifiers should be dimensionned accordingly and first cap should not be low ESR, with lower value than the second stage.
The Power supply is critical with this simplistic design! You are welcome if you need further details!