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Old 20th February 2012, 07:55 PM   #1
diyAudio Member
Join Date: Apr 2011
Location: Kolkata
Default Battle of CHIPS!!!!!!

hi everyone,

For 30-40w guitar power amplifier which chip you will recommend concerning power rating and mostly on the sound quality ( warmth in the sound is preferable as to emulate tubes as much as posssible ). please provide the reason from the experience that u have gathered in your DIY journey........

thank u guys!!!!
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Old 20th February 2012, 08:20 PM   #2
GloBug is offline GloBug  Canada
Join Date: Jun 2011
LM3875- apparently the nicest sounding, out of the gainclone type chips.

Its a 56w chip, so it would be easy to cool running at ~30-40w.

I fix a lot of random small SS guitar amps, I have not seen anything impressive in them as far as chips go. I think it would be easy to better them by using a nice chip to begin with.

As far as emulating tubes the closest distortion breakup you going to get is with Germanium diodes. They clip the earliest and the smoothest compared to silicon etc.

There is lots of documentation on here for chipamp power supplies, make it beefy.

I know it seems like a tough comparison between a "Hifi" and a guitar amp.
In reality a SSguitar amp is pretty much a "HiFi" amp with effects.

Also you should note that these chips are used in some of the nicer sounding SS gear.

Here is a link to an amplifier board you could build from or get ideas. Its for an LM3886 which is similar to LM3875 but with more power. I myself would try building the LM3875 though.
LM3886 Schematics + PCB
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Old 20th February 2012, 10:22 PM   #3
Minion is offline Minion  Canada
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Join Date: May 2006
Location: Cowican Bay , vancouver island
I like the TDA7293/94 chips for guitar amps .... When pushed hard they impart a pleasant distortion that is a bit tube like ...... Maybe it"s because of the mosfet outputs ....

You could allways put a tube preamp before the Poweramp to get some tube distortion ......
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Old 21st February 2012, 05:00 AM   #4
diyAudio Member
Join Date: Apr 2011
Location: Kolkata
hey Minion please share your experience on TDA7293/94 chips vs lm3886/3875.......
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Old 21st February 2012, 01:00 PM   #5
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I'd second it for TDA7293/4 guitar amp. Its easily adjustable for tone and its clipping performance is less abrasive than lm3886/lm3876/lm3875/lm4780, etc. . .
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Old 21st February 2012, 01:36 PM   #6
GloBug is offline GloBug  Canada
Join Date: Jun 2011
Why are you clipping the amp anyways? Clipping the SS power amp sounds like complete garbage, there is no such folk lore as "this chip has warm breakup compared to that"

That's what the clipping diodes are for. You can try Germanium, Silicon, red LEDs etc.

-Germanium sounds the most "tubey" due to it's lower forward voltage and smoother breakup.
-Silicon diodes have a higher forward current, raising the level before it clips, clips harsher.
-Red LEDs are similar to silicon, experiment as there are a variety of colours and types.

You run the chip clean and use effects before it hence "a HiFi with effects."
It's no different then using a distortion pedal into a clean amp, same idea, just integrated.
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