John Curl's Blowtorch preamplifier part II - Page 4054 - diyAudio
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Old 21st June 2013, 07:31 PM   #40531
jcx is offline jcx  United States
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Originally Posted by john curl View Post
Well guys, I have been complaining about excessive distortion in hi K ceramic caps for the last 39 years. Showed measurement in print in 1978. It is a wonderful thing the EDN 'exposes' this problem to today's engineering audience.
Of course, NPO is better, and even very linear, but how about DA? No thanks, I will stick to polystyrene when I can.
must have been falling on deaf ears among those incredibly stupid "audio designers" you keep complaining about here John – probably the “design by ear” crowd

after all any "meter reader" would have caught out hi-K ceramic distortion trivially during measurement - if they hadn't actually read the datasheets, seen the Vcoeff to start, restricted use to non-signal path

Pease graphed NP0 DA - as you well know - it ranks better than Mica, competitive with some film types, with manufacturer being a larger variable

Last edited by jcx; 21st June 2013 at 07:51 PM.
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Old 21st June 2013, 08:08 PM   #40532
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Originally Posted by SY View Post
He's also committed to one tonearm. Fashion audio customers hate not being able to mix and match and swap frequently.
Not to mention accessorize.

The Audio Guild
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Old 21st June 2013, 10:04 PM   #40533
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A Burning amp attendee from Monterey told me he had many of the ADI Updates and would try to scan and email them but I lost track of him, maybe he will be there this year. Never saw the ones you mentioned and would like to.
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Old 21st June 2013, 10:10 PM   #40534
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Default CE marking

Originally Posted by DF96 View Post
As I understand it, you need CE (and lead-free?) to place something on the market in Europe. Personal imports would bypass this system, but in the event of a fire your insurance company might ask some questions.

In the UK CE marking is not seriously enforced so all sorts of (mainly Chinese) junk comes in, with or without CE stickers
Remember that the Chinese are copying everything.
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Old 21st June 2013, 11:14 PM   #40535
bcarso is offline bcarso  United States
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Originally Posted by stinius View Post
Remember that the Chinese are copying everything.
Yes, I remember how cheerfully some people said they could make a label that said CE, if that was what the product needed!

But everybody is getting more attentive, I think, these days.
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Old 21st June 2013, 11:48 PM   #40536
fas42 is offline fas42  Australia
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China Export ...

Copying Everything ...

Can't Envisage what comes next ...
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Old 22nd June 2013, 01:53 AM   #40537
RNMarsh is offline RNMarsh  United States
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I wouldnt put the preamp in a head-shell far from the pivot unless i needed to add weight to the headshell for some strange reason. But in the platter/TT base is fine.

-Thx RNMarsh
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Old 22nd June 2013, 10:04 AM   #40538
marce is offline marce  United Kingdom
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Out of curiosity RNMarsh, why?
Though my initial thought was not putting the whole pre-amp, though with todays smallish op-amp and fet packaging that would be possible, but just an intermediate signal conditioning (line driver) to boost the signal from the minute voltage put out by the cartridge, so a stronger signal is transmitted to the pre-amp.
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Old 22nd June 2013, 10:34 AM   #40539
qusp is offline qusp  Australia
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could you use some sort of mems accelerometer to produce feedback for compensating mechanical error?
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Old 22nd June 2013, 12:57 PM   #40540
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Originally Posted by qusp View Post
could you use some sort of mems accelerometer to produce feedback for compensating mechanical error?
How would you corellate the motion to signal error? We have a 3 axis one that runs on 1uA. It's for pacemakers and I joke that it's a "I fell down and can't get up" signal.
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
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