John Curl's Blowtorch preamplifier

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#9,101
john curl said:
Do you mean that they just don't STEAL your name? I am missing out on something. :bigeyes:
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One of my Biz Partners/friend is sometimes called in to be an expert in court regarding noise control, structural,and acoustics issues.

He tells them: "$400 an hour, from the moment I get out of my chair...(At home)..or $1200 an hour, if I have to put a suit on."

It's fun to make the lawyers wince, for once.

BTW, if someone develops the idea of cascaded 'precharged' capacitors linked to the circuit via 'soft switching', please be decent enough to call it a 'ring supply'. A nice name that covers the basics of the operative form. I have reviewed it multiple times since mentioning it, and I see no reason why it should not be able to equal a battery supply system in sonic quality. There are reasons why it might exceed that particular point in fidelity of the battery supplies. Jack would know the folks to mention this to. It would be right up their alley, re needs and requirements. Batteries are generative, thus noise. Capacitors are storage not generation, and might be found to have a lower noise floor-even with the switching.

For those who are paying attention, this idea easily encompassed a basic applications patent, but I have forgone this in order to share this with the overall world of audio. This will also include measurement and instrumentation, who would likely be the first to pick it up and use it. The application is universal.
 
#9,102
john curl said:
I am posting the JC-1 input stage through SY. There are a few small changes, but it is much the same.
Click to expand...

And here is the Owner Manual.
In case somebody now manages to Diy Build a Clone 😀
So that you know what you have built & can properly Operate yout JC 1 clone.
Congratulations and Thank You for Choosing Parasound

Your new Parasound Halo Series JC 1 mono block power amplifier represents the latest
advancements in amplifier technology.

The JC 1 was designed by CTC builders and it uses higher
quality parts and achieves higher performance than any amplifier we’ve made since Parasound
was founded in 1981.

We’re proud to offer you this exceptional audio component, knowing that it
will bring you many years of enjoyment and dependability.
Here at Parasound, we design our products to perform at a higher level of flexibility and sonic
performance than you may have expected. We encourage you to read this entire manual to learn
all the features and capabilities of your new JC 1 Amplifier.
If you’re eager to get up and running right away, simply follow the basic step-by-step instructions
to connect and operate the JC 1.
------/snipp/---------------
The Parasound Staff
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http://www.parasound.com/pdfs/JC1Manual.pdf
 
#9,103
the front of JC-1
is abosultely nothing to show to anybody
npthing happends there .. except for one LED TURNS ON

the rear, .. the backside
.. is where we get a hint of some operation features
jc1_rear_big.jpg
 
#9,107
PMA said:
For input stage + VAS folded cascode + ideal buffer + FB, the distortion is very low (much les than 0.001%), at some 55Vpeak:
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According to your graphs at 1kHz. The THD at 20kHz is a different story. Loading the VAS with the input impedance of the output stage (=more realistic) is an even more different story.

BTW, my front-end + VAS + OPS load + VCVS + NFB does 50ppb at 20kHz. 😀
 
#9,115
Re: superconductivity

auplater said:



dunno about "normal wire"... probably has to do with the BCS model... you're the physicist...

I'd suppose since the electron/phonon cooper interaction responsible for superconduction would presuppose lack of impurities, vacancies, and lattice defects (pinning dislocations, etc.), as the wire probably wouldn't superconduct if these existed and/or caused a problem, perhaps given a different mode of conduction, these presumed "residual effects" wouldn't be an issue in a correctly made superconducting interconnect.

But again, I'm just a lowly materials guy, not a physicist.😉 😉

John L.
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It turns out that SC is amazingly tolerant to the defects that push normal state resistivity up. In fact, non-magnetic defects have almost no bad effect at all; heavily alloyed wires with very high normal state resistivity superconduct just fine. Magnetic defects (e.g. alloying with Iron or other magnetic elements) do suppress superconductivity pretty strongly.

For high current operation, type 2 materials are used, and the current carrying properties improve massively when defects are introduced; heavy alloying or intermettalic compunds are used, and then they are extensively mechanically altered to produce very high defect densities.
 
#9,119
Re: Re: superconductivity

PigletsDad said:


.... the current carrying properties improve massively when defects are introduced....
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Yes, I was aware of having read something along this in SA several years back.
If I remember well, it has to do with the artificial introduction of extra energy levels in the lattice, which promotes Cooper pair forming. Is
it that way?

Rodolfo
 
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