Re: A Challenge for Stewart Pinkerton


"John Byrns" <jbyrns@xxxxxxx> wrote in message
news:jbyrns-2602061554290001@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Hi Stewart,

In response to Andre's KISS amp you gave us your solid state KISASS
amplifier design, although you never built it. Considering this is
actually a tube group, and you are a very clever engineer, I challenge you
to design a tube amp for the group that will meet your exacting standards,
show some originality, and be relatively simple in concept and design. In
this challenge, since you are a solid state guy, negative feedback can be
used freely, and there is no need to actually build the amplifier, as long
as it is a reasonably simple and practical design capable of an output of
a few Watts of high quality audio. The question is do you have the
necessary engineering skills to actually meet the challenge?


Regards,

John Byrns


Morning John. Parallel thoughts:-) I wrote a post to Stewart on
exactly the same topic last night, and put in in the drafts folder to be
sent this morning. My post was not a "challenge" but a request for
an interesting project.

Stewart is, as far as I know, the only "precision analogue engineer"
on RAT. With a couple of notable exceptions, most of us are
hobbyists. So he seems to be the perfect person to lead a good
project.

I had in mind something a bit more high.end. Maybe 80-100W
UL PP. Many people like the sound of the EL34 so maybe four pairs
per channel :-) and a differential cascode front end would be nice:-)
he can choose the LTP.

We are all familiar which the schematics from the GEC handbook,
Jones, O'Connor and Glass Audio, so I sure Stewart will not need
to cut and paste anything from those, but will want to present us
something high in performance and innovation.

A project is incomplete while only on paper, and any
self respecting designer would surely take the treouble to build and
test his design. I would like to see this as a more "in depth" project
than the one you describe above, John. For many amp builders,
the most difficult part is achiveing unconditional stability
..
Stewart could take us through the procedures of dominant
poles, and step networks etc, and setting the bandwidth
open and closed loop.

I will be happy to host Stewart's schematics, design
notes, metalwork drawings, pics, transformer specs etc
on my website for as long as necessary.

Let's look forward to an interesting project.
Please start the ball rolling Stewart.

Iain



.

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