Teflon ? Scientist? They got Teflon from that 1946 saucer crash, well i guess you could say they stumbled upon it ...
That's an urban legend, I think. It is my understaning that teflon was developed by duPont for NASA, who needed something to coat the returning shuttle with, given that it develops around 18,000 deg C upon entering the atmosphere and tends to be somewhat overdone by the time it hits the sea.
In fact, NASA's requirements gave us a lot. FM multiplex also, and I am told that even the chromium-dioxide tape was developed for their comms. It stayed pretty much theirs until 1969, when some bright kid in H/K remembered it existed and applied it to a home casette deck.
Given how badly they need cutting edge technology, I am hardly surprised.
Teflon or rather PTFE was around long before NASA was formed. NASA would never have used a fluorinated hydrocarbon as a coating or part to be externally exposed to the frictional heat on reentry.
Why is polypropylene better for hip joints than PTFE? PTFE may be better in film capaicitors. t does have exceptional properties along with all the other fluorinated polymer possible conpounds - a vast number all with variations that can be exploited by man and including NASA.
" . . given that it develops around 18,000 deg C upon entering the atmosphere and tends to be somewhat overdone by the time it hits the sea."
I think the absolute peak temperatures are about 5000F with 3000 more the norm.
I think the absolute peak temperatures are about 5000F with 3000 more the norm.
One zero less.
Teflon was never used as a thermal insulator there
Space Shuttle thermal protection system - Wikipedia, the free encyclopedia
IIRC the initial thermal analysis, simulation and the development of the insulating silica ceramic tiles was done at the Technical university of Stuttgart
The Zenith FM stereo multiplexing was published in the fifties
CrO2 tape was commercialised in the sixties by DuPont
(Voice and data recorders in aviation never used CrO2 tapes)
Notice the SMD capacitor // to the coil on Roksan Shiraz
George
More sauce.
HF distortion at 3-8 %
Channel balance all over the place
Hardly flat freq. response
You see why you need to reach for those rose tinted specs?
😀
Yet, they do sound good.
Makes an absolute mockery of all this sub ppm b.s. on power amplifiers
HF distortion at 3-8 %
Channel balance all over the place
Hardly flat freq. response
You see why you need to reach for those rose tinted specs?
😀
Yet, they do sound good.
Makes an absolute mockery of all this sub ppm b.s. on power amplifiers
Teflon ? Scientist? They got Teflon from that 1946 saucer crash, well i guess you could say they stumbled upon it ...
Hi, that seems not true reading here:
Polytetrafluoroethylene - Wikipedia, the free encyclopedia
DuPont is a fantastic company that has invented a number of really prodigious materials used everywhere in the world
Regards, gino
I'll jump in and answer a couple of peoples comments as my time is limited this week and this moves so fast.
Distortionless stylus is a relative description. Audibility is more interesting POV with this stuff. I have a Lyra Kleos and what I hear doesn't sound "distorted".
The groove noise is often accentuated by any number of other mechinisms.
The resolution I was alluding to in my response to John was not related to the noise floor. My perception is that it is related more to how much interaction/obscurring of the various components of a musical signal occurs in the subtler parts of a recording. We've all heard systems where instruments or background vocals seem to disappear in the presence of more dominant parts of a recording. Some musically natuaral systems (vinyl? Hi-rez) do a better job at keeping this all sorted out, how would one measure or quantify for this?
Gotta go, Mike
No it doesnt , we had this same discussion with vacuphile , adding anymore distortion to the rig is a no , no, for reasons why limited bandwidth system sounds bad with analog and favor digital. Distortion is around us daily , how much thd can one detect, is it the amount or the unnaturalness of whats presented.
I met one of the aliens, he confirmed the story , he knows everything , the government gave him his cover , supposedly a research chemist...
why is this thread called "John Curl's Blowtorch preamplifier part II" when most of the posts are similar to stroking a camels jenny taylor? oops here comes the sin bin again
It happened that after 1959 Prof. John H. Argyris moved to Germany (Director of the Institute for Statics and Dynamics of Aerospace Structures -Institut fur Statik und Dynamik der Luft und Raumfahrtkonstruktionen- at the Technical University of Stuttgart), so the analytical and computational work was done there.
He was already famed for working only on intractable problems. 🙂
George
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