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   rec.audio.tubes      Tube-based amplifiers... that go to 11      52,877 messages   

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   Message 51,973 of 52,877   
   Alex Pogossov to flipper   
   Re: Professional Radio Engineer   
   23 Dec 12 12:03:45   
   
   From: apogosso@tpg.com.au   
      
   "flipper"  wrote in message   
   news:bs38d858p80urk8rf2a2b2vt6i3kgk4aoh@4ax.com...   
   > On Fri, 21 Dec 2012 16:20:27 +1100, "Alex Pogossov"   
   >  wrote:   
   >   
   >>   
   >>"Phil Allison"  wrote in message   
   >>news:aji2eiFjcm0U1@mid.individual.net...   
   >>>   
   >>> "Alex Pogossov"   
   >>>   
   >>>>   
   >>>> And besides, "professionals" do not use 6.3mm jacks for the speaker   
   >>>> connectors, unless the contacts are gold plated. With nickel plated   
   >>>> steel, contact resistance is unstable within a few milliohms which is   
   >>>> no-no for any decent audiophil!   
   >>>   
   >>>   
   >>> ** You must be thinking of "audiophools" not audiophiles.   
   >>>   
   >>> Nickel plated *brass* 1/4 inch jacks and plugs are fine for speakers,   
   >>> millions of instrument amps have used them for decades. Removal and   
   >>> insertion plus occasional cleaning is all that is needed.   
   >>>   
   >>> Gold plating is only for small signals.   
   >>>   
   >>Ah, was kidding...   
   >>For the instrument amps, perhaps a jack is OK, but audiophools shall use   
   >>enormous gold plated terminals, and a special litz speaker wire of perhaps   
   >>2000 insulated 0.07mm strands each, so that ohmic loss is small and   
   >>constant   
   >>from DC to 1MHz..Otherwise you lose transparency of the highs!   
   >>   
   >   
   > I saw one site selling multi-thousand dollar speaker cables with the   
   > 'feature' that in THEIRS the signal traveled at 90% the speed of   
   > light. Which, of course, is critical when sending audio 10 feet.   
      
   A brilliant idea came to me. We need to start manufacturing special   
   audiophoolish coaxial cables with Z=4ohm impedance, Z=8ohm impedance and   
   Z=16ohm impedance. Using such coax as a speaker cable an audiophool can   
   achieve perfect matching of the speakers to the amp in the widest frequency   
   range. Group delay will be constant within picoseconds! They will line up to   
   buy such a cable. It will be very thick though as the inner diameter shall   
   be very close to the outer diameter to have low characteristic impedance.   
      
   Those audiophools who use Cyclotron amps, of course can not use unbalanced   
   coax in a fully balanced system. For those we will manufacture multilayer   
   ribbon cables with the same standard impedances! (Ordinary twisted pair is   
   unsuitable -- it has far too high characteristic impedance.) Perhaps as an   
   alternative a special twisted Litz can be used with half of the strands in   
   parall serving as conductor A, the other half -- conductor B. Most likely it   
   shall be impregnated by some high epsilon goop -- for higher capacitance and   
   hence lower impedance.   
      
   How does this sound?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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