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Old 4th April 2011, 02:17 AM   #31
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by smoking-amp View Post
Could be, a fairly obvious scheme........
might be when you think of Blumlein
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
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Old 7th April 2011, 09:41 PM   #32
tinitus is offline tinitus  Europe
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just found something called Ultra Para Linear

found here
http://locofonic.alphalink.com.au/valves.htm
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File Type: jpg 1937 Utra Para linear.jpg (45.8 KB, 160 views)
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Old 11th April 2011, 12:37 AM   #33
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Parafeed + Ultra Linear - what else would you call it ???
Cheers,
Ian
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Old 16th April 2011, 05:12 PM   #34
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by gingertube View Post
Parafeed + Ultra Linear - what else would you call it ???
Cheers,
Ian
hey, this got me thinking of UL Circlotron

funny, I always thought PPP meant paralel PP
and just now I find it means parafeed PP
leading to UL PPP
and Circlotron

I hope its still 'on topic'
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Old 16th April 2011, 06:59 PM   #35
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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.
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Old 16th April 2011, 07:41 PM   #36
Yvesm is offline Yvesm  France
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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

Yves.

Last edited by Yvesm; 16th April 2011 at 07:43 PM.
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