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Old 23rd February 2013, 04:29 PM   #121
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Been out of town and away from wife for over a week. I have to stay away from that particular version
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Old 23rd February 2013, 04:32 PM   #122
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Quote:
Originally Posted by buzzforb View Post
called you a snob
And folks ask why I frequently wake up with my fingers around his neck.

Bare in mind that Paps still is an Ace in cost cornering, still goes for 85k works.
(a Homey Economicus of audio)
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Old 23rd February 2013, 04:35 PM   #123
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I guess he has been at it long enough that we can say he is delivering the goods.
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Old 23rd February 2013, 04:35 PM   #124
49 - for the 18th time
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Quote:
Originally Posted by jacco vermeulen View Post
And folks ask why I frequently wake up with my fingers around his neck.

Bare in mind that Paps still is an Ace in cost cornering, still goes for 85k works.
(a Homey Economicus of audio)
And at the same time will hold workshops that will show you how to trim about $84,750 bucks off of that tab..... (depending on if ya wanna include a gold plated bus thingy or not)....
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Old 23rd February 2013, 05:00 PM   #125
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bus thingy or not
Welded/soldered lug bus bar, yes.
Goldplated, no.
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Old 23rd February 2013, 05:39 PM   #126
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And at the same time will hold workshops that will show you how to trim about $84,750 bucks off of that tab..... (depending on if ya wanna include a gold plated bus thingy or not)....
This E-rapport is beneficial at many levels. It is entertaining, brings together people from all over the planet, and spurs ideas which maybe silly-crazy; like this one. Mr. Pass gives Dr. Mazzola 60 enlosure sides of to-be Xs or Y or Z amps. Build me a monolithic array of [60] SiC JFETs or SITs in each plate. Piece of cake; maybe!. Dr. Mazzola then integrates 30 SIC BJTs per side for KRELL amps. He then makes available sides [and heat sinks] for enclosures for switching apps and audio diy etc. Another beautiful color for the Xs amps is the black finish of SiC; baked or epitaxi.
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Old 24th February 2013, 02:40 PM   #127
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I hope that you [like I] wish to keep this thread alive, entertaining and stimulating. Although the Xs amps are commercial, let's talk nonetheless about their guts. It'll give us a feel for this state of the art/science. I'll analyze/scour their published literature, look at pictures of their insides to develop good estimate circuits. Fortunately, its all there. Let's begin.


Question?
  • Are the power amplifying transistors NJFET or MOSFET?. At issue is the relative sum of their input capacitance; expected to be higher for MOSFET. I vote for SemiSouth NJFET.
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Old 24th February 2013, 02:46 PM   #128
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Mosfet or Jfet. Driving them is non issue with beefy Vas
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Old 24th February 2013, 03:04 PM   #129
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MOSFET.

From the higher resolution images on the other Xs thread, one can also tell which brand/type was used in either amp case.
(don't let any power JFET semiMouth jokes there distract you, just fun to fool around with all things relative)
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Old 24th February 2013, 03:14 PM   #130
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You have better software than I if you can see brand of mosfet
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