need a simple yet powerfull DIY amplifier to MJ21193G / MJ21194G power trans'

[WhiteRhino]

Hi , I have a 70WPC Marantz 2270 here
The preamp is perfect .
But I have troubles with the main amp
I full recapped it ,also bought a new output transistor MJ21193G / MJ21194G and still there is problem with the main amp.
I got tired of trying fixing this main amps .

I want to build a new power amp with the excelent power trans' MJ21193G / MJ21194G

can you guys recommend me a simple yet powerfull amp schematic ?
by the way the 2270 has power suplly of 45 + - DC
thanks

 

[Tekko]

Why not use the circuit of the marantz power section as a starting point ? These are usually the basic blameless topology.

 

[WhiteRhino]

Its too compllicted . and it has many of Components .
I am searching of amp with a topology that match the MJ21193G / MJ21194G

because i can not product a pcb , i want it with the lowest Components number ,and yet a powerfull one at least a 70wpc

 

[xtechee]

Do you have a serrvice manual, I do.

Would you like a copy of the amplifier schematic, and some help making the
original amps work?

 

[WhiteRhino]

I have the service manual .
I spent allot of hours trying fixing it and just got tired...
I prefer to spend a 50$ and save my time....

I am searching for a simple amp because i can not make a pcb
and will use the generic pcb .
if I will not find I'll buy the L7 amp
Find L7 MOSFET High-speed 2 Channel FET MOSFET Power Audio Amplifier Kit Need Solder on eBay Global Buying, with worldwide deals on items in all your top categories

 

[quadtech]

WhiteRhino,

I had issues with the 2270 amp boards too - a botched repair job by a previous tech.
It took me some time, but I eventually got them going (rebuilt them), and they
sound absolutely great now.
The story is here, with a a list of replacement components which worked
for me.

https://picasaweb.google.com/prasadb/Marantz2270
https://picasaweb.google.com/prasadb/Marantz2270#5660656382607434418
2270: No bias?! - AudioKarma.org Home Audio Stereo Discussion Forums

I was also looking for a suitable amp board during moments of frustration,
and considered the ebay L20 class D, ebay L7 (there's a thread on them here, I think),
the Leach amp, Symasm , Panson Audio amps and such,
which would work off the (approx) +/- 50 volt rails of the 2270.

I nearly settled for the Symasm with the MJ21193G / MJ21194G, before I got the
actual boards going.

http://www.diyaudio.com/forums/chip-amps/153511-compact-sized-lme49810-11-thermaltrak-amp.html
http://www.diyaudio.com/forums/class-d/191739-my-design-l20d-irs2092-irfi4020h-200w8r.html