John Curl's Blowtorch preamplifier part II - Page 2452 - diyAudio
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Old 14th July 2012, 11:17 PM   #24511
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Quote:
Originally Posted by 1audio View Post
Slot's book
Audio Quality, requirements for high quality audio equipment.
Philips technical library, 1964.
(Gerard Slot, part of a series of paperback publications, both in Dutch and English)

=>
This book deals with the problem of obtaining the quality of sound reproduction that will give the maximum satisfaction to those listening to it.
The author considers the whole problem objectively.
A chapter spent on discussing the "problem" is followed by one on the technical specifications.
This leads on to one on loudness level and power requirements.
Then follow successively chapters on non-linear distortion, frequency response, pitch deviation, and background noises.
Two chapters are then devoted respectively to stereophony and ambiophony, and finally the author deals with the classification of systems and the use of equipment.
Contents include: The problem - the technical specification - power requirements - non-linear distortion - frequency response - pitch deviations - background noises - stereophony - ambiophony - experimental evidence - classification - the equipment.
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Old 14th July 2012, 11:32 PM   #24512
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Slot's book is pretty darn good. I recommend it.
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Old 14th July 2012, 11:51 PM   #24513
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Quote:
Originally Posted by john curl View Post
. Well, I disagree.

You just don't pay attention to what is being said, yes ceramic caps are not optimal in the signal path but as RF bypass they are fine, YMMV. Please don't mix up my comments to prove a point. The differentiation in the two applications was very clearly stated.
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Old 14th July 2012, 11:57 PM   #24514
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I don't think that they are good for bypass, either. That is WHY I use REL. RT polystyrene in all my power supplies. I DIRECT COUPLE so I don't NEED series caps, BUT Sony DOES use ceramics as coupling caps. I know, because I have a Sony tuner here that has them.
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Old 15th July 2012, 12:07 AM   #24515
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OK, everyone, let me once again give MY history of coupling and bypass cap use.
40+ years ago: tantalum, aluminum, ceramic
38 years ago: tantalum, mica, polycarbonate (Levinson era)
35 years ago: tantalum, mica, polycarbonate, polystyrene
32 years ago mica, Rel. polystyrene, polypropylene (servos introduced)
30 years ago to present: Rel. polystyrene, polypropylene, small caps Siemens polystyrene.
That is what I recommend today, if they are purchasable.
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Old 15th July 2012, 12:19 AM   #24516
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Quote:
Originally Posted by serengetiplains View Post
Apart from your reacting without understanding the purpose of my previous post---you might want to check that reflex, as it's quite abrasive---what, in your world, does a bypass capacitor bypass? DC?

OK I reviewed your post #24486 you cut and pasted from two sources and added not one word of commentary, I'm not a mind reader, sorry, make a concise point before telling me that I'm abrasive (even though I am).

BTW I learned from the expert, Paul Brokaw is one of the most brilliant engineers that I have ever worked with and he believes a design review is a battle and critics should be as confrontational and abrasive as possible. That is the only way to vet a new design.

The design process as "Fight Club".
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Last edited by scott wurcer; 15th July 2012 at 12:27 AM.
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Old 15th July 2012, 02:09 AM   #24517
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Quote:
Originally Posted by john curl View Post
I don't think that they are good for bypass, either.
Why they should be bad for bypass if on a frequency range that is their job they have as low as needed impedance?

However, they have one very bad disadvantage: metalized film caps can be self-healing, while ceramics are more like "self-shorting". They go absolutely short.
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Old 15th July 2012, 02:13 AM   #24518
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Quote:
Originally Posted by john curl View Post
OK, everyone, let me once again give MY history of coupling and bypass cap use.
40+ years ago: tantalum, aluminum, ceramic
38 years ago: tantalum, mica, polycarbonate (Levinson era)
2 years
Quote:
35 years ago: tantalum, mica, polycarbonate, polystyrene
3 years
Quote:
32 years ago mica, Rel. polystyrene, polypropylene (servos introduced)
3 years
Quote:
30 years ago to present: Rel. polystyrene, polypropylene, small caps Siemens polystyrene.
That is what I recommend today, if they are purchasable.
Hmmm... Do you mean, you recommend today "Nothing new to learn in 30 years" approach, John?

(Just kidding)
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Old 15th July 2012, 02:15 AM   #24519
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Not much new in 30 years, BUT at least I use good caps, exclusively.
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Old 15th July 2012, 05:05 AM   #24520
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Quote:
Originally Posted by scott wurcer View Post
OK I reviewed your post #24486 you cut and pasted from two sources and added not one word of commentary, I'm not a mind reader, sorry, make a concise point before telling me that I'm abrasive (even though I am).

BTW I learned from the expert, Paul Brokaw is one of the most brilliant engineers that I have ever worked with and he believes a design review is a battle and critics should be as confrontational and abrasive as possible. That is the only way to vet a new design.

The design process as "Fight Club".
Having brilliant minds around the table to dissect and analyze any subject you please is likely to bear fruit.

However, I didn't think abrasiveness adds anything.

Where's Thorsten by the way?
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