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Old 20th September 2012, 09:10 AM   #111
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Location: Athens GREECE
....i wonder what excuse anyone will have to comment this work as nice and tidy while a bunch of errors and some of them quite critical

--twisted cables are very wrong for such an application
--even worst if all of them tied up all together
--crosstalk figures will hit the sky
--even worst when input and output cables also tied together ( oscillation will be waiting around the corner )
--i see no decoupling anywhere in the power supply ( s)
--i wonder if any adjustments needed how they are going to be done
--I see no inductor but may be i am wrong and trust me in a six ch amp is obviously needed

nice looking job doesn't mean that is also proper ...
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Old 20th September 2012, 09:14 AM   #112
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just seen the decoupling ...my mistake
just seen the non existing vbe multiplier
thermal run away will be there
even worst when common heat sinked on a common heatsink while the one amplifier will warm up the other .

at least take the cooling and ventilation advice given
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Old 30th October 2012, 09:44 AM   #113
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Join Date: Apr 2005
Location: India
Thanks for feedback..
Amp is running fine..
Few problem in found are
1. Some noice can be heared when audio is muted ( May be twisted cables issue as pointed by "sakis" above) or some circuit layout design problem (Power supply in on the same board).
2. MFD Cabinet and Poor Heatsink result heating... but not too much..

Solution .. will be making new layout, Powersupply will go on saprate board..and a new cabinet and some good heatsinks..
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Old 21st March 2014, 04:32 AM   #114
Mayan is offline Mayan  Hungary
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Location: debrecen, hungary
Default my build


Picture 006.jpg

Picture 007.jpg

Hi there, I built it too, sounds so good ! Very good deep bass and clear, sweet mid and trebles. PS +-36V, 24mA /channel. I'm very happy with it.
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Old 21st March 2014, 06:46 AM   #115
Mihkus is offline Mihkus  Estonia
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Location: Estonia, Viljandi
Has anyone ever done any measuring on this amp? THD+N and bandwith, fq response?
Got pretty much everything to build it little subwoof amp
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Old 21st March 2014, 11:32 AM   #116
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Location: Coffs Harbour, on the east coast
The original design is a utility amp. i.e. for general purpose use in audio for musical instruments, monitors, desk amplifiers etc. Not hi-fi. THD is ~0.05% @ 50W/8R.

That assumes the original design parts lineup which included MJ802/4502 output transistors for 125W/4R. The remainder were all small-signal T092 transistors, BC546/56 types, including the drivers. Without decoupling, noise is largely power supply dependent, so a really well designed and built power supply is going to improve hum and noise substantially.

Here is a link to Greg Erskine's site, showing a test build on a commercial PCB with the T092 transistors.
However, I would be concerned about the use of this design for subwoofer duty which is the highest average current duty for amplifiers. I think there are better designs for woofer amps and they usually involve more output pairs for a given power rating. That means more drive current and gain too.

The design is the basis for AKSA 55 and B-AKSA. To all accounts, they sound just fine and AKSA 55 sold as an audiophile kit product internationally, so something must be good about this ultra-simple, minimum parts count design.
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