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|4th April 2011, 01:17 AM||#31|
diyAudio Moderator R.I.P.
invented the cross ferenced bias, mentioned previously
and didn't he also invent ultra linear
just didn't yet have the trafo UL tap
and I didn't know that Williamson's amp was 'adapted' to be used for most of the UL tapped amp
and another surprice that the Quad scheme may have been way ahead of them all
but as usual, it's also a matter of marketing
and that was obviously very strong on the side of UL tap
and lots of other good stuff was put in the shaddow
it's kind of interesting that all this seems to come alive now
UL tapped trafos are still the industrial standard
but may not last so long
for what I know, Amplimo only has the rights to the name Super-triode
I dont think they can ever have a patent on the trafos
so, if there will be a demand, others may follow
that is if there are available curcuits
like with the hen and the egg
but the Amplimo is certainly a good start
well, from what I found on other fora, many have failed with the super triode
found a debate between Le'Cleach and some others debating with Japanese enthusiasts
even the good man AllenWright was around saying that it wouldn't work
or was the other Wright
problems with increased distortion
but maybe it's easier with trafo coupling
for which I guess it was originally invented
|16th April 2011, 04:12 PM||#34|
diyAudio Moderator R.I.P.
|16th April 2011, 05:59 PM||#35|
Join Date: Dec 2001
Location: Hickory, NC
Since parafeed is not normally needed for P-P, I would think that PPP would usually refer to parallel P-P.
It's hard NOT to get UL with Circlotron, since just using a fixed screen voltage from ground reference gives UL, due to the cathode moving around.
|16th April 2011, 06:41 PM||#36|
Join Date: Jul 2004
That's why each screen is tied to the opposite anode !
And to obtain a fixed screen voltage from the two full floating PSU you just have to sum them with two resistors and a by pass cap !
You may even stabilize'em if you wish
Last edited by Yvesm; 16th April 2011 at 06:43 PM.
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