need a simple yet powerfull DIY amplifier to MJ21193G / MJ21194G power trans' - diyAudio
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Old 25th July 2012, 08:01 PM   #1
diyAudio Member
Join Date: Jul 2011
Default need a simple yet powerfull DIY amplifier to MJ21193G / MJ21194G power trans'

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
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Old 25th July 2012, 08:25 PM   #2
Join Date: Jan 2005
Why not use the circuit of the marantz power section as a starting point ? These are usually the basic blameless topology.
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Old 25th July 2012, 08:38 PM   #3
diyAudio Member
Join Date: Jul 2011
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
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Old 25th July 2012, 10:07 PM   #4
xtechee is offline xtechee  United States
diyAudio Member
Join Date: Oct 2007
Location: Washington State
Default 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?
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Old 25th July 2012, 10:16 PM   #5
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Join Date: Jul 2011
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
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Old 27th July 2012, 01:33 PM   #6
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Join Date: Oct 2007

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.
2270: No bias?! - 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.

Compact Sized LME49810/11 +ThermalTrak Amp

Last edited by quadtech; 27th July 2012 at 01:50 PM.
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