PHL in class AB?

PeteMcK · 20th December 2006, 07:39 PM

I find the simplicity of this design appealing, but am not happy with the environmental destruction wrought by Class A afficionados (excepting those who live in cold climates and need to keep their gluhwien warm). IOW, I'm too tight to buy a big PS trannie.

I wonder how the PLH would work run in class AB,
and whether there is sufficient adjustment available in the current circuit, or would some changes to the bias chain be required?

Cheers,
Pete McK

Nelson Pass · 20th December 2006, 08:05 PM

I don't think it's a very good design for Class AB operation, and
would still be pretty inefficent in AB.

DIGORA · 4th January 2007, 08:49 PM

why not AB class biassed to obtain class A AT 50% of power ?

bobsinclar · 4th January 2007, 11:34 PM

I made 2 of them, and noticed that the linearity , even at low power levels were bias dependand, and the "flat" curve was really obtained with the highest bias, also under biased it was jut sounding boomy. was just perfect with high bias...
but these are just my considerations , and may just reflect what I experienced but I am not scientist, so these are just quick impressions I had while trimming the whole thing..
Vince

DIGORA · 7th January 2007, 09:25 PM

http://img457.imageshack.us/img457/4...eek4330xz0.jpg

what do you think about this creek amp ?

Nelson Pass · 8th January 2007, 09:11 PM

Quote:

Originally posted by DIGORA
http://img457.imageshack.us/img457/4...eek4330xz0.jpg

what do you think about this creek amp ?

Why do you mention it?

DIGORA · 9th January 2007, 08:10 AM

hi

Mosfet quasi complementary
phase spliter
class AB
without output capacitor

20th December 2006, 07:39 PM	#1
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Western Sydney	PHL in class AB? I find the simplicity of this design appealing, but am not happy with the environmental destruction wrought by Class A afficionados (excepting those who live in cold climates and need to keep their gluhwien warm). IOW, I'm too tight to buy a big PS trannie. I wonder how the PLH would work run in class AB, and whether there is sufficient adjustment available in the current circuit, or would some changes to the bias chain be required? Cheers, Pete McK

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20th December 2006, 08:05 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	I don't think it's a very good design for Class AB operation, and would still be pretty inefficent in AB.

4th January 2007, 08:49 PM	#3
DIGORA diyAudio Member Join Date: Aug 2006	why not AB class biassed to obtain class A AT 50% of power ?

4th January 2007, 11:34 PM	#4
bobsinclar diyAudio Member Join Date: Jun 2006	I made 2 of them, and noticed that the linearity , even at low power levels were bias dependand, and the "flat" curve was really obtained with the highest bias, also under biased it was jut sounding boomy. was just perfect with high bias... but these are just my considerations , and may just reflect what I experienced but I am not scientist, so these are just quick impressions I had while trimming the whole thing.. Vince

7th January 2007, 09:25 PM	#5
DIGORA diyAudio Member Join Date: Aug 2006	http://img457.imageshack.us/img457/4...eek4330xz0.jpg what do you think about this creek amp ?

9th January 2007, 08:10 AM	#7
DIGORA diyAudio Member Join Date: Aug 2006	hi Mosfet quasi complementary phase spliter class AB without output capacitor