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How good / bad is this amp made?
How good / bad is this amp made?
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Old 19th November 2012, 11:22 PM   #11
Jay is offline Jay  Indonesia
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Looks like a gainclone chip. Should sound better than it looks. And looks like there is opamp pre also. JRC4558 may be? May be not, because any chip amp rated above 50W deserve more than a 4558.
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Old 19th November 2012, 11:38 PM   #12
Andersonix is offline Andersonix  Sweden
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How good / bad is this amp made?
It's bad ju-ju to scavenge a working amp. Hod rod it with more PS caps. Then when it blows up you can scavenge from it...
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Old 19th November 2012, 11:42 PM   #13
Stormrider is offline Stormrider  United States
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If this is the Amp100 (looks like it) it has a pair of LM3886's. It's probably one of the better commercial chipamps.

The AmpOne had discrete amplifier circuitry and tested very well at avsforum.

Both amps are slight upgrades over a typical receiver, but that's all.
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Old 20th November 2012, 01:18 AM   #14
Evenharmonics is offline Evenharmonics  United States
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This is AMP100 (stereo) by AudioSource. Chip is TDA7293 and spec is 60W @ 8 Ohm, 75W @ 4 Ohm, 160W @ 8 Ohm bridged.

I was about to build a monoblock amp for center channel of my home theater and I decided to look inside of this amp before listing on ebay. Based on the going rate of used ones, I may get better value out of salvaging parts from this amp than selling it and buying new parts for a diy amp.

Here's another look at the module.
Click the image to open in full size.
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Old 20th November 2012, 01:24 AM   #15
wahab is offline wahab  Algeria
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Originally Posted by Evenharmonics View Post
Chip is TDA7293
Keep it alive , you ll have trouble equaling the perfs of this chip
with a discrete design set apart power output.

Moreover , it is vastly superior to NS 38XX chips thanks
to its mosfet output stage.

In this amp it is used at conservative power since it s rated
110W/4R and 140W/8R as limit values by Stmicro.
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Old 20th November 2012, 01:28 AM   #16
nigelwright7557 is offline nigelwright7557  United Kingdom
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It is quite shocking when you open some of these cheapie amps to find tiny transformers and heat-sinks.

If I were you I would find a better design and build your own.
PCBCAD51 pcb design software. 2018 version out now >>>>>> http://www.murtonpikesystems.co.uk
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Old 20th November 2012, 01:35 AM   #17
freax is offline freax
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replace the coupling caps in-line with the signal path and call it a day, then once it dies for good strip it for spare parts.

I don't see this amp lasting much longer anyway.

Those large filtering capacitors aren't exactly name-brand if you know what I mean.
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Old 20th November 2012, 02:13 AM   #18
techbiker is offline techbiker  United States
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Looks nice!

I see some quality metal film resistors and who knows the brand of those filter capacitors? Could be decent. I would say fix it, then sell it if you are looking for something different.
2X Com-tech 400, Improved Headphone Amplifier
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