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Post by puffin on Feb 21, 2017 9:32:10 GMT
I was looking for some info on one of the Class D amps I have just resurrected and came across a site I had some input into some years ago. I am not sure whether to be impressed by my own reviewing "skills" or embarrassed  if you have the stamina to read to the end. www.justblair.co.uk/gain-clones/gain-clones.html |
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Post by jandl100 on Feb 21, 2017 11:56:12 GMT
I've had 3 gainclone amps - 2 DIY jobs off of ebay and one off a respected electronics guy on AOS. I can't recall now what the chips were.
I'd rate them as Good in terms of sq. Better than average but substantially short of the best amps I have owned. For me they fall short in terms of ultimate transparency and resolution, and a bit smoothed dynamically - overall just a bit on the bland side. But possibly some unknown random bods' DIY builds may not be a fair test, although the 3rd one had a very similar sound. It may be OTT to suggest a house sound for gainclone amps based on a sample of 3, but I rather suspect that there is one.
Tbh, pukka 47 Labs fell off my Want List at that point, although I would still be vaguely curious to hear some.
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Post by MartinT on Feb 21, 2017 12:53:49 GMT
The Texas Instruments LM3886, which is the core of Gainclones, is a high power op-amp on a chip. Just looking at the application note circuit shows a large amount of overall negative feedback (R1/R2). I would expect it to sound just as Jerry describes.  |
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Post by puffin on Feb 21, 2017 13:15:02 GMT
Interesting. I suppose everyone hears differently and perhaps different things. I would not say that either incarnation (3886/3875) sound rolled off or dull to me, as that it is a characteristic that I avoid in an amplifier.
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Post by jandl100 on Feb 21, 2017 13:34:27 GMT
They didn't sound rolled off or dull to me either.
-- perhaps a little lacking in sparkle at the top.
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Post by MartinT on Feb 21, 2017 13:42:34 GMT
Yes, not frequency rolled off as the NFB would take care of that. It was Jerry's reference to 'a bit smoothed dynamically', which is a trait I recognise from high NFB designs.
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if you have the stamina to read to the end.
