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Old 3rd April 2011, 09:44 PM   #21
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"looked to me like he connected the UL tap to the catode and cross referenced the PP plates
ahead of his time ?"

Hey,that's my Elliptron design! Extremely advanced. What was the title and source of that article?

Maybe: "Amplifiers and Superlatives" by D.T.N. Williamson and P.J. Walker (Wireless World)? I don't see Elliptron in that article, just ordinary CFB.
There is also JAES April 1954 Vol2, No2 by Williamson and Walker, I don't have a copy of it unfortunately.
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Old 3rd April 2011, 10:18 PM   #22
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getting closer
http://www.next-tube.com/articles/wi...Williamson.pdf

appears that Williamson and Walker designed the Quad amps together
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Old 3rd April 2011, 11:07 PM   #23
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and the original
http://www.mif.pg.gda.pl/homepages/j.../wil/AandS.pdf

cant find that genuine paper with original Williamson
but it was definately very similar to Quad schematic
and their answer to ultra linear
not sure what its called
super linear
trafo coupled catode feedback
or ?
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Old 3rd April 2011, 11:26 PM   #24
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I don't see anything about "cross coupled" in the "Amplifiers and Superlatives" article. Is that where you meant? I just see CFB coupled, like for the Quad ampl.
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Old 3rd April 2011, 11:32 PM   #25
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Quote:
Originally Posted by smoking-amp View Post

Hey,that's my Elliptron design! Extremely advanced. What was the title and source of that article?
I found it on google, somewhere
that is yours ?
hey, thats fun, I hope

yeah, I know its not the original drawing from Williamson and Walker
couldn't find it again
but it was similar to yours
and very close to Quad schematic

hey, your Elliptron looks interesting, using UL tap to drive the catode in crossreferenced circlotron style
bloddy hell, was it really 2003
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Old 3rd April 2011, 11:37 PM   #26
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EL84 (6BQ5) are great in Ultralinear, better than triode or pentode mode with respect to THD and IM - See this for comparisons.
http://www.retrovox.com.au/STC6BQ5.pdf

Some "light" reding for those with UL Interest.
A definitive Ultralinear study by F. (Fritz) Langford-Smith and A.R. Chesterman (Yes - that is F. Langford-Smith of Radiotron Designers Handbook fame.) Investigates tapping percentages for the 6V6 in particular.
http://greygum.net/files/radiotronics/UL.pdf

By the way, Greygum (2nd link) has quite a few articles from Radiotronics. Radiotronics was the "industry" magazine from the AWV tube factory in Sydney, Australia where F. Langford-Smith worked.
Go here for the list of articles.
AWV Radiotronics - Miscellanea

As for the other Ozzie link that appeared earlier in the thread - well my mum always said "If you don't have anything good to say.... then don't say anything at all" - enough said.

Cheers,
Ian
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Old 3rd April 2011, 11:40 PM   #27
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Quote:
Originally Posted by smoking-amp View Post
I don't see anything about "cross coupled" in the "Amplifiers and Superlatives" article. Is that where you meant?
no, but that's what I saw in a schematic looking very old
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Old 3rd April 2011, 11:52 PM   #28
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"but that's what I saw in a schematic looking very old "

Could be, a fairly obvious scheme, just never seen it before. Sure would like to see that schematic and what they had to say.
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Old 4th April 2011, 12:15 AM   #29
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Quote:
Originally Posted by smoking-amp View Post
Could be, a fairly obvious scheme, just never seen it before. Sure would like to see that schematic and what they had to say.
hey, I'm sure I saved it, somewhere
but I have so many links its become hard to find anything

but it was a really complicated scheme
you know how messy those older schematics look

gave up on google
will look further, to see if I have it saved
you know, sometimes stuff is hidden in a link to some other site
but I usually also save it as picture document, if important
too many of those too
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Old 4th April 2011, 12:25 AM   #30
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I know what you mean. I tried to find a schematic I had seen on the forum here this summer, only months before searching. Never could find it, spent a whole day trying. I even posted a new thread asking if anyone remembered it. One person did, but they couldn't remember anymore about it! Then a month ago, I ran across it in the RDH4! Was an amplifier with global feedback to the preamp tube screen grid.

There were some posts here a few years back that had a superficial resemblance to Elliptron mode. Was about a patent for a P-P OT used for SE mode. The two winding halves were used in a way to cancel the DC. It gave 3 versions, only one of which actually worked. Required an inductor though.
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