Hiraga "le monstre"

[danieljw]

Hi all here is a pic of my regulated le monstre,

and the link.

http://diyaudioprojects.com/Solid/Je...ga-Le-Monstre/




-Dan

[Tyimo]

Hi Dan!

I have to say the amplifier sounds really really good has any one else tried it ???

Yes, me too, but with unregulated giga PSU like the original. Not bad. It is good for a reference PP amp.

Greets:

Tyimo

[danieljw]

Hi There,

Yes i tested this amp and found very good results both using a reactive speaker load and a resistive load.

Have you built the 20W or 30W hiraga ? I want to build that one next

-Dan

[Tyimo]

I built the Le Monster, but I know the Class A (20W version) also very nice sounding amp. Maybe with a bit warmer sound.

Tyimo

[bluevas]

what is the good speaker for le monstre ? Any suggestion? Because it's only 8 watt. thank you guys

[danieljw]

Well

Hiraga Mentioned using the onken style enclosures and voice of the theatre enclosures with this amp

but they are a little large and hard to get

i personally have used 86dB speakers with no problems but that is a 5 x 8m room.

-Dan

[HKC]

Hi to all

What idss class (GR/BL/V) of the 2SK170/2SJ74 should be used for the Hiraga "le monstre" power amp to get the best sounding result?

Best Regards

[lineup]

Originally posted by HKC
What idss class (GR/BL/V) of the 2SK170/2SJ74 should be used
for the Hiraga "le monstre" power amp
to get the best sounding result?

hey.
This nobody knows. you just would have to try and listen.
As you ask about 'sound'.

If you mean technically best data of operation into a specific LOAD
it may be easier to try to test or simulate an optimal bias of input stage.

The short answer is, the input FETs should be biased
to get the desired Class A idle current in Output stage.
This current level, would be your choice.
would be different for different wanted power output into different LOADs.
4, 6 or 8 Ohms speakers

This version of Hiraga, in image, uses 2SK246 / 2SJ103
and the bias is set to like 4 mA, for ~ 1 Ampere in output stage.
But I am sure you use some other version / setup
for the Hiraga monster.

[HKC]

Originally posted by lineup


hey.
This nobody knows. you just would have to try and listen.
As you ask about 'sound'.

If you mean technically best data of operation into a specific LOAD
it may be easier to try to test or simulate an optimal bias of input stage.

The short answer is, the input FETs should be biased
to get the desired Class A idle current in Output stage.
This current level, would be your choice.
would be different for different wanted power output into different LOADs.
4, 6 or 8 Ohms speakers

This version of Hiraga, in image, uses 2SK246 / 2SJ103
and the bias is set to like 4 mA, for ~ 1 Ampere in output stage.
But I am sure you use some other version / setup
for the Hiraga monster.

Hi Lineup

Thank you for your answer.
Yes I meant technical best data. My speaker load is 8 Ohm and I will use parts as specified on original schematic which the input JFets are 2SK170 & 2SJ74

Best Regards

[danieljw]

Hi All,

Lineup = interesting answer

HKC = see the link in my signature line or google the "class a amplifier site" it has the info in the jean hiraga index.

-Dan