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Old 17th May 2008, 03:27 PM   #11
bego2 is offline bego2  Croatia
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Thanks. I see that lm3886 is very nice chip.
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Old 17th May 2008, 10:46 PM   #12
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It's always a good time to build a LM3886 gainclone, they are a great value and magically simple.

I have spent the whole afternoon listening to the LME49810 with HEXFETS (IRFP240/IRFP9240) and its really, really good with them. It does sound a bit more "mosfet" than with the 2SK1530/2SJ201 pair but much less harsher. In fact it's worst problem is being too perfect, it resembles too much to a very good car audio system, clear and airy, and i don't like car audio.

I see lowering the slew rate as a last resort since downgrading a key parameter seems a bad idea unless it's the only way to fix a sonic problem (Now talking about those designs that add extra compensation caps to LM3886 amps to compensate what? A bad layout ).

I will give a try to a tube buffered LME49810+IRF because i thing it might add some non-objectionable "soul" to the chipamp (lack of air is objectionable) and far from the "car stereo on steroids" (A serious one, 170V B+).

I would love to read other's feedback about these and other amplifiers (LME49811, LME49830, LM1875, istrumentation approach to chipamps (mauro penasa and BWRX ones), and opamps driving discrete output stages (dracula amplifier)). My first post was anything but comprehensive!
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Old 18th May 2008, 03:56 AM   #13
ttan98 is offline ttan98  Australia
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Quote:
Originally posted by ionomolo
[B]
I see lowering the slew rate as a last resort since downgrading a key parameter seems a bad idea unless it's the only way to fix a sonic problem (Now talking about those designs that add extra compensation caps to LM3886 amps to compensate what? A bad layout ).

/B]
look at this thread, post 46, he uses Cx=50pf!

i need help with this LME49810 schematic

exceesive you may think...but it works for him.
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Old 18th May 2008, 03:32 PM   #14
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After listening to it with the IRF ones and the toshiba ones my conclusion is that (in my system) the toshiba ones sound plain harsh.

With the HV tube pre it sounds close to perfect. I shouldn't make that claim because it's not comparative and heavyly biased, but it's really, really good. I will leave amplifiers for some time once i've fixed microphonics. (It sounded woody on a wooden box and metallic on a metal box, at first glance i thought i was going insane but the effect was obvious and undeniable. At the moment i've solved it placing a heavy transformer on it but this is not a good idea for the final version and microphony is still visible on the scope. Weirdest thing i've seen so far).
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