On Tue, 04 Sep 2007 18:47:10 +0100, Jim Lesurf
wrote:

Hi,

Just to let people know that I've now put up some webpages on Jim Sugden's
original Class A solid state power amps. You can find these via a new link
on the AudioMisc page (URL in my sig below). :-)

I will add more pages on JES as and when I get a chance. Next to be added
will be pages on the Hi Fi News 'home constructor' version of the
amplifiers, and pages on the A41/A51 and their control (pre) amps.

Hope people find the pages of interest.

Slainte,

Jim

Definitely, thanks for those. Have to say that the biasing methods
have a very fragile look to them; Sugden definitely had a bee in his
bonnet about how an amplifier should work. Unfortunately for him it
wasn't long after all this that people started to suss how to make a
class B amp without the huge distortion rise at low level.

I'm a little surprised he didn't get as far as a long-tail pair for
the input. The technique was well enough known by then. Perhaps a
component count issue? Transistors cost a fortune back then; I can
remember my 30/- OC71.

d

--
Pearce Consulting
http://www.pearce.uk.com