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In Reply to: RE: Quality of Cathode Bypass Capacitors in the SET Amps? posted by megasat16 on April 18, 2015 at 10:06:24
Caps are the worst component in audio. Only the best are even remotely usable, and despite how they measure statically, they play back music narrow band !!On two stage Direct Coupled amps, the Rk bypass is critical and important to get right. It is little understood, from what I see, know of, and have heard, to date.
Its NOT cheap, bypassing ( properly ) can cost more than ALL the other components in the amp, combined !!
In a SE amp, every cap, coupling, Rk and Power Supply Cap, is "in" the audio circuit, and as such, every cap goes BEGGING to be optimized.
I only know of one person in all of audio who has done this bypassing properly. Not yet me !! Soon though.
Jeff Medwin
Edits: 04/20/15 04/20/15Follow Ups:
"Caps are the worst component in audio. Only the best are even remotely usable, and despite how they measure statically, they play back music narrow band !!"
Are you refering to transients/tone bursts or pure sine waves?
I recall reading that the greatest % of music is a tone burst rather than pure sine waves making it difficult to test for the average hobby-level builder.
Perhaps DF's extreme cap bundles do a better job at reproducing the tone bursts/transients in music that the single bypass cap would do.
"I recall reading that the greatest % of music is a tone burst rather than pure sine waves making it difficult to test for the average hobby-level builder."
Most of the measuring instruments we use, including IM and THD analyzers, only relate to continuous sines. Such tests do yield a great deal of useful information about amplifier performance, but due to the nature of music, much is missing. I don't know any DIYer who can measure TIM, and even in the commercial arena, I don't believe anyone has yet established a standard for simple signal conformity (what comes out is an exact duplicate of the randomly changing signal that went in). The latter would require an arbitrary waveform generator and very fast digital analysis system. Difficult, but not impossible. I believe this would go a long way toward filling the gap between conventional measurement techniques and what we hear.
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Buy Chinese. Bury freedom.
Except for some forms of electronic music, pure sine waves do not exist with acoustic instruments. All of the wave forms were best described by Bob Fulton as ODD WAVES !!!
Yes, pulse study has a LOT to do with audio, the big dogs in a well funded collegiate EE lab use 2 million dollar test equipment that can study transfer efficiency, anywhere in the circuit !!
Jeff Medwin
'Yes, pulse study has a LOT to do with audio, the big dogs in a well funded collegiate EE lab use 2 million dollar test equipment that can study transfer efficiency, anywhere in the circuit !!'
Elaborate please...
Al
Its all about selling amplifiers employing the sweet siren song of a dynamic expander. Arrgh, but she is a fickle mistress. Jeff has been deputized, or should I say, puppetized to perform these diatribes of deception.
This has echos of a claim made by another inmate that Ray Kimber spent $120,000 on test equipment to identify that black insulation was bad . Trouble is with this claim that Kimber cables use black on just about everything . I would expect Jeff's claim to have a similar conclusion .
Al
On another 2a3 DC ultrapath thread you mentioned double stacking the PSTs, and that this would get rid of the cathode resistor. Does that also get rid of the cathode bypass capacitor?
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Big speakers and little amps blew my mind!
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