Another new Rod Elliot amp! p3B!

Mattyo5 · 24th January 2004, 01:57 PM

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

Jax · 24th January 2004, 02:07 PM

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.

millwood · 24th January 2004, 02:17 PM

what's so unique about it vs. p3a? I thought p3b is just an overbiased p3a? what else?

Mattyo5 · 24th January 2004, 02:48 PM

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?

-Matthew K. Olson

Stu · 24th January 2004, 02:56 PM

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...

Mattyo5 · 24th January 2004, 03:02 PM

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

Andypairo · 26th January 2004, 12:03 PM

I strongly suggest you a inrush limiter...

Cheers

Andrea

mefinnis · 26th January 2004, 12:15 PM

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

Upupa Epops · 26th January 2004, 12:29 PM

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 !

peranders · 26th January 2004, 12:36 PM

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

24th January 2004, 01:57 PM	#1
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	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

24th January 2004, 02:07 PM	#2
Jax diyAudio Member Join Date: Nov 2003 Location: South Sweden	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. __________________ Jan

26th January 2004, 12:29 PM	#9
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	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 !

26th January 2004, 12:36 PM	#10
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Re: New Elliot's amp ... yeah, but you have not heard Mr Elliott's amp yet.....so careful with your verdict. __________________ /Per-Anders (my first name) or P-A as my friends call me

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24th January 2004, 02:17 PM	#3
millwood Account Disabled Join Date: Apr 2003 Location: US	what's so unique about it vs. p3a? I thought p3b is just an overbiased p3a? what else?

24th January 2004, 02:48 PM	#4
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	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? -Matthew K. Olson

24th January 2004, 02:56 PM	#5
Stu diyAudio Member Join Date: May 2003 Location: Wollongong	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...

24th January 2004, 03:02 PM	#6
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	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

26th January 2004, 12:03 PM	#7
Andypairo diyAudio Member Join Date: Sep 2002 Location: near Milano , Italy	I strongly suggest you a inrush limiter... Cheers Andrea

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