Thanks for the full description, Henry. The question is not whether
the circuit is propriety or whether you adapted it but whether it
started in a Gordon Rankin circuit. Or you might decide you'd rather
stay out of Yaeger's futile flame war.

I was saying just the other day that we miss you; even the flame wars
are of a much lower quality than when you were here. And Patrick is
always saying that there is not enough interesting discussion of
tubes.

Here, let's see if you're in a suitable frame of mind not to explode
on RAT within the week: Isn't Wolfie's monicker a bit presumptuous for
someone of your amateur standing on the piano?

If you can internalize that without heartburn, perhaps you should
give RAT a go. We'll all be very nice to you. Won't we, chaps?

Andre Jute
Impedance is futile, you will be simulated into the triode of the
Borg. -- Robert Casey

On Sep 14, 6:55 am, "Wolfgang Amadeus" wolfgang@amadeus,com wrote:
"Andre Jute" wrote in oglegroups.com...
At the same time you lied about the provenance of an amplifier you had
bought from Pasternack. I pointed out that either Pasternack lied to
you or you knowingly lied about who designed that amplifier. Instead
of correcting your description, you abused me in public.

The amplifiers I sold to Jon were a pair of monoblocks using a Williamson
style driver, 5881 outputs, and Dynaco replica output transformers wired in
ultralinear configuration. The power supply consisted of a 1000V transformer
with tube rectification and a choke-input filter with large electrolytic fiter caps,
yielding about 425-450V B+ depending on the AC mains voltage. The input
stage tube was a 6DJ8 and the driver tube was a 6SN7.

Jon subsequently modified the amplifiers to use KT88 output tubes, as I
recall.

You can see pictures and a schematic he

http://picasaweb.google.com/hap1128/5881Amplifier

This was the second amplifier implementation on these chassis. The
original amplifiers used a through-hole output transformer, the bias supply
board was mounted on standoffs (still visible) in the vicinity of the power
switch and IEC socket, and where the bias supply is located now (lower
left corner in the photo) there was originally a dual solid-state bias and B-
supply regulator, the circuit of which I adapted from a schematic published
by Erno Borbely. The driver circuit was a direct-coupled cascade differential
type, which sounded great but which I abandoned due to troubles maintaining
DC balance.

As you can see from the schematic, there is absolutely nothing original --
but neither is it proprietary -- about the design. I described these amplifiers
at length and in detail on the newsgroup long before ever meeting Jon. The
layout and mechanical design, the construction techniques, and so on,
were of my own choosing.

I thought the amplifiers worked extremely well in spite of their unfashionable
plainness. I hope this clears up any confusion about the "provenance" of my
amplifiers.

-Henry