Suggestions for a DIY class AB amp

[archat68]

Hello all fellow DIYers.

I'm looking to build a 100+100w (at8 ohm) class AB amp with discrete chips. As a member here superb musicality is important.

I'm pretty good at diy although haven't ventured into anything serious for quite a long time.

Initially I though about going for a LM 3886 based Amp but looking about the availability of the chip I'm pretty sure that I'll end up with a fake. There is neuro chrome kit. But I'm not ready to spend that much. There are a number of kits with discreet chips available in the market like this but not sure about the quality as there is no review anywhere.

8 Mosfet Pro Gold Stereo Series(215) - Salcon Electronics

Original Toshiba Japan 5200 1943 Transistor Used best pre amp dual supply board for tone control for High fidelity Output Input Supply : 30-0-30 dual supply to 50-0-50, 8 Amp. Input / Output sound - Stereo PCB made of superior quality Fiberglass PCB Packaging Including: 1 x Audio Board...

www.salconelectronics.com

So my requirements are a class AB amplifier with around 100w each channel with discreet mosfet in around 20K including everything (psi, cabinet etc.).

So request members with experience DIY to chime in and pour out their thoughts.

Thanks in advance.

 

[keith_correa]

Since your location says: Kolkata, see if you can visit these guys: https://www.facebook.com/astron1708

 

[sound1]

Apologies for going a bit OT. I came across this article last week and it was an interesting read. diyaudio.com has some details on the build. Haven't tried it, not sure if it can compete with modern builds, and there aren't many reviews online. Probably an interesting project if someone feels a little adventurous

My 40-Year Love Affair with a Remarkable Amplifier—A Class B Amplifier for Audiophiles - Technical Articles

The Blomley amplifier was designed over forty years ago, is an alternative power amplifier design that suffers virtually no distortion, and provides a sound which has the presence often lacking in conventional amplifiers.

www.allaboutcircuits.com

DIY Audio thread:

The Blomley Class B amplifier

Hi to u all, has anyone heard about the class B Blomley amplifier.It appears that it can sound as good as a class A amplifier according to Audio Express magazine.Those who have built that amplifier,can they share with us their experience and detail how the amp works. Thanks.

www.diyaudio.com

 

[bobbyprajan]

Have a look here. Shaan is also from Kolkata. Not sure whether everything will fit in 20K though

 

[archat68]

Apologies for going a bit OT. I came across this article last week and it was an interesting read. diyaudio.com has some details on the build. Haven't tried it, not sure if it can compete with modern builds, and there aren't many reviews online. Probably an interesting project if someone feels a little adventurous

My 40-Year Love Affair with a Remarkable Amplifier—A Class B Amplifier for Audiophiles - Technical Articles

The Blomley amplifier was designed over forty years ago, is an alternative power amplifier design that suffers virtually no distortion, and provides a sound which has the presence often lacking in conventional amplifiers.

www.allaboutcircuits.com

DIY Audio thread:

The Blomley Class B amplifier

Hi to u all, has anyone heard about the class B Blomley amplifier.It appears that it can sound as good as a class A amplifier according to Audio Express magazine.Those who have built that amplifier,can they share with us their experience and detail how the amp works. Thanks.

www.diyaudio.com

Thanks for the reply.
Adjusting the quiescent current in a Class B amp may be tricky without proper support.

 

[archat68]

Since your location says: Kolkata, see if you can visit these guys: https://www.facebook.com/astron1708

Thanks. Lots of kits are there. But I'm looking for suggestion for which actually sounds good.

 

[archat68]

Have a look here. Shaan is also from Kolkata. Not sure whether everything will fit in 20K though

It's quite costly. A fully built Amp comes around 80-90k.

 

[MaSh]

Have you considered picking up a vintage amp and doing a ground up restoration? Could be a vfm diy project.

MaSh

 

[archat68]

Have you considered picking up a vintage amp and doing a ground up restoration? Could be a vfm diy project.

MaSh

No. Not considered that way. Getting a vintage at good price and judging the actual condition of the amp would be difficult task, I think.

 

[Anshul_J]

I have heard discrete dynamics amps by @Aniket, and found them to be very good. He gives fully assembled amps and pcb boards(kits) as well, and is reasonably priced.

 

[MaSh]

No. Not considered that way. Getting a vintage at good price and judging the actual condition of the amp would be difficult task, I think.

True, the hunt could be tough but once done could be quite rewarding.

How is the availability of diy amp kits in India though?

MaSh

 

[archat68]

True, the hunt could be tough but once done could be quite rewarding.

How is the availability of diy amp kits in India though?

MaSh

Kits are plenty but quality is uncertain.

 

[Kannan_madhu]

if you want to try some low-wattage stuff JLH1969 is a good option, it's a class-A design well documented on the net, the Sound quality is very good, and its easy to make. It has only a few components. But you need some sensitive speakers as this gives only 10W ( that's more than enough for medium-sized rooms )