Jean Hiraga - Le Monstre 8W Class A Power Amp

[bijinmb]

Hi Folks,

Just completed Jean Hiraga - Le Monstre.

It really is a Monster in all aspects.

I have to say the amplifier sounds really really good.

The sound seems effortless and gives the impression of a much higher power amplifier.


Technical Details:

PCB Dimension: 82mm x 101mm.
PCB Thickness: 2mm.
Copper Thickness: 70um (4 times normal thickness)


Capacitor Bank: Alcon 22000uf, 40VDC x 2 / rail (min. config. to start with, though i have provided space in the cabinet to upgrade with 4x22000uf per rail).
Wires used: PTFE, Silver coated strands
VU Meters: Sony, Japan.
Gold Plated Binding post, RCA: MX India.
EMI/RFI Filter: 6A, Elcom.
Toroidal Transformer: 11-0-11, 8A.
Power Supply Type: CRC
Biased Current: 1A and its locked. (Trimpot in the circuit is to correct the DC Offset)

Parts List:

• Dale mil grade 1% resistors.
• Toshiba low noise J-FETs 2% Idss MATCHED 2SK170/2SJ74.
• Low Cob Hitachi 2SA872/2SC1775 and 2SB716/D756.
• MATCHED( hfe matched to 5%) Sanyo Power transistors.
• Japan-made Non-inductive 5-Watt power resistors.

Schematics




Build Snaps:

 

[ukjeyaraj]

Waiting to see. Looks like a tank. Very professional finish (as ever from you).

 

[jai1611]

Really pro looking fit and finish. Congrats. What speakers are you planning to pair it with?

 

[mohanb4169]

Excellent finish...kudos for the patience.

 

[karmapilots]

Looks like a million bucks. Good one mate.

 

[odyssey]

where did you get the metal work done? superb

 

[GeorgeO]

Very well done.Congrats! This kind of completed project is what budding diyers can aim for.

 

[prem]

Superb, clean look. Very well done.

 

[bijinmb]

Really pro looking fit and finish. Congrats. What speakers are you planning to pair it with?

I think this amp do great job with

1. Markaudio Alpair 10 Gold.
2. Fostex Fe126en etc...

I have plan to build TL enclosure with any of those drivers.

where did you get the metal work done? superb

I got the metal works done from a person nearby my native.
He also make cabinets for Torvin, chennai and Ex. Defender stabilizer etc.

He is basically from Tamil Nadu, but settled here in Kerala for the past 16 Years.

A skilled engineer and very good knowledge especially in these kinda (audio related) cabinet works.

 

[gvenu]

What a beauty man!!! Hats off..

Next time in Kerala, I will be at your place!

Regards
Venu

 

[bijinmb]

What a beauty man!!! Hats off..

Next time in Kerala, I will be at your place!

Regards
Venu

You are most welcome. Heard a lot about you from my brother.
We must meet!

 

[prem]

Hi Bijinmb

Wouldn't a Jean Hiraga designed Altec 604 make sense?

 

[Gijo George]

Pure awesomeness :licklips:

The quality of your work (and the photos) are good to be posted straight on to Stereophile mag.

Too good. Titus had told me about your speaker project. Need to gatecrash your party one of these days

 

[bijinmb]

Hi Bijinmb

Wouldn't a Jean Hiraga designed Altec 604 make sense?

That make sense, but the question is from where we are going to get

15-incher with coaxial compression tweeter?

Its an expensive and lofty thought...LOL...

 

[alankar1977]

Superb !!!

 

[prem]

Hi bijinmb

I think you can buy a Altec 604 from Great Plains Audio. Rajiv on this forum is the Altec expert. He will be able to guide you better.

 

[bijinmb]

Hi bijinmb

I think you can buy a Altec 604 from Great Plains Audio. Rajiv on this forum is the Altec expert. He will be able to guide you better.

Thanks for the information Prem.

 

[bijinmb]

Pure awesomeness :licklips:

The quality of your work (and the photos) are good to be posted straight on to Stereophile mag.

Too good. Titus had told me about your speaker project. Need to gatecrash your party one of these days

Thanks, Titus is energetic Nomad towards audio stuffz!

 

[captrajesh]

Wouldn't a Jean Hiraga designed Altec 604 make sense?

That make sense, but the question is from where we are going to get

15-incher with coaxial compression tweeter?

Its an expensive and lofty thought...LOL...

I think you can buy a Altec 604 from Great Plains Audio. Rajiv on this forum is the Altec expert. He will be able to guide you better.

I think Rajiv's speakers are made of Altec 605s. Those speakers would probably be played at the forthcoming Chennai HiFi meet.

We would love to have you over to pair your amp with Rajiv's speakers Bibin.

 

[bijinmb]

I think Rajiv's speakers are made of Altec 605s. Those speakers would probably be played at the forthcoming Chennai HiFi meet.

We would love to have you over to pair your amp with Rajiv's speakers Bibin.

Wonderful build..thanks for posting that image Capt..