John Curl's Blowtorch preamplifier part II - Page 2810 - diyAudio
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Old 11th October 2012, 06:07 PM   #28091
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I am a consultant for a number of audio companies. I have found that every time I allow a 'compromise' in layout, fabrication, parts quality, etc, that I make a mediocre product. Now, FR-4 is good enough for Parasound, and we can get an 'A' rating. But I don't expect any Parasound product to still be held as amongst the greatest audio products ever made, 10 or 20 years beyond their fabrication.
That is why the CTC Blowtorch and Vendetta Research were made with better materials than FR-4, because they had to, and still do to compete with virtually everything in the world.

Last edited by john curl; 11th October 2012 at 06:17 PM.
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Old 11th October 2012, 06:43 PM   #28092
PMA is offline PMA  Europe
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So why are you thinking of conductive plastics now? Horrible compromise.
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Old 11th October 2012, 06:49 PM   #28093
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What are you criticizing, PMA? Please be more complete in your complaint.
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Old 11th October 2012, 06:54 PM   #28094
wrinkle is offline wrinkle  United Kingdom
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Quote:
Originally Posted by SY View Post
That's one good way. Guard rings work, too. I use Teflon turret standoffs.
Bingo, I needed those for a circuit with 30-50G feedback resistors, but even so the board needed to be spotless. A wash with IPA then a dry with a heatgun and it would be good for a year or so before dust/grime made it leaky again...

Wrinkle
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Old 11th October 2012, 07:00 PM   #28095
rsavas is offline rsavas  Canada
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Quote:
"CTC Blowtorch and Vendetta Research were made with better materials than FR-4, because they had to"
Well that is certainly is an informative reason why not to use epoxy/glass construction, for audio applications!! I guess I am missing something here or simply do not understand your reasoning. Sorry about that.

Rick

Last edited by rsavas; 11th October 2012 at 07:03 PM.
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Old 11th October 2012, 07:01 PM   #28096
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Quote:
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That's one good way. Guard rings work, too. I use Teflon turret standoffs.

There are several good mics using guard ring and overcoat on FR-4.
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Old 11th October 2012, 07:15 PM   #28097
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Quote:
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Well that is certainly is an informative reason why not to use epoxy/glass construction, for audio applications!! I guess I am missing something here or simply do not understand your reasoning. Sorry about that.

Rick
Maybe it's the DA noise.
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Old 11th October 2012, 07:23 PM   #28098
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rsavas, would you make a quality cap with FR-4? That is the answer to your question.
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Old 11th October 2012, 07:27 PM   #28099
rsavas is offline rsavas  Canada
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Thanks Scott, for adding to my confusion - Sorry to ask, what is "DA" noise?, boy, do I have a lot to learn and their is only so much time left!! Cheers Rick
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Old 11th October 2012, 07:29 PM   #28100
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Quote:
Originally Posted by scott wurcer View Post
Maybe it's the DA noise.
Digital Absorption noise? It should sound like sucking of numbers.

Can't imagine how it sounds...
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