Another new Rod Elliot amp! p3B! - diyAudio
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Old 24th January 2004, 01:57 PM   #1
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Default Another new Rod Elliot amp! p3B!

Well, something else new and interesting from Rod Elliot. Just saw this today.

http://www.sound.westhost.com/project3b.htm

figured i'd give everyone a heads up :-D

-Matthew K. Olson
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Old 24th January 2004, 02:07 PM   #2
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Cute little amp. CFP with bootstrapped VAS.

Looks similar to the 20W amps I made some 25 years ago using BD599/600 outputs. It was very sensitive to shorts on the output.

This one should be easy for those starting with DIY.
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Old 24th January 2004, 02:17 PM   #3
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what's so unique about it vs. p3a? I thought p3b is just an overbiased p3a? what else?
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Old 24th January 2004, 02:48 PM   #4
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Doesn't look very unique...you are right. Input cap is smaller ...cheaper? and r9 and r10 are 3.3k instead of 2.2k emmiter resistors are .33 instead of .47ohms. Devices are slightly different, though I think that if another pair of output devices were added....you could just overbias the regular p3a to the same effect. Who knows. I'm really just talking out my rear end right now. Anyone else have an opinion?

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Old 24th January 2004, 02:56 PM   #5
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Mattyo5 - Rod has also changed the p3a to those new values, the main difference that I can see is the suggested power supply - lower voltage and more capacitance, with inductors also included.

And of course the fact that the bias current is much higher...
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Old 24th January 2004, 03:02 PM   #6
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Well...i got some big heatsinks....maybe I'll crank up the bias to like 3-5A haha. Too bad I don't even have a p3a done yet. Just gotta use a 1kva toroid per channel. No problem Actually, there is a problem...I keep throwing the breaker in my condo when I switch on my Holton monoblocks. later!

-Matthew K. Olson
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Old 26th January 2004, 12:03 PM   #7
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I strongly suggest you a inrush limiter...


Cheers

Andrea
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Old 26th January 2004, 12:15 PM   #8
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Default Actually ....

Quote:
From Rod's website
As can be seen, it is not a complex amp, and in fact is absolutely identical to that for P3A ......
I think it is fair to say that Rod isn't claiming some great breakthrough/change ..... just making it more user-friendly for building, PCBs etc.

Reminds me a little of an A40, but using discrete devices cf darlingtons .... couldn't pick on him for that ..... and I still quite like my A40

mark
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Old 26th January 2004, 12:29 PM   #9
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Default New Elliot's amp

It is out - of - date circuit, without any current limitation, with big distortion. New PMA's amp, called A - 2, is similar easy to build and have very much lower distortion - below 0,001 %. It have 30 W into 8 ohm. I have heard it and I must say that's amazing !
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Old 26th January 2004, 12:36 PM   #10
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Default Re: New Elliot's amp

... yeah, but you have not heard Mr Elliott's amp yet.....so careful with your verdict.
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