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In Reply to: RE: Thanks... posted by mkuller on June 26, 2015 at 09:54:53
I hadn't watched that video for over a year so couldn't remember about whether or not op amps were mentioned. I personally would stay away from op amps. Discrete circuits/designs were the reason we paid more. So what happened? Can't tell me op amps got that much better. I'd have to hear it.
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...personally I have found few solid state amps I could live with for any length of time - there was something always irritating about them, a glare in the upper midrange or some sort of subtle distortion that bothers me.So I have ended up with tubed amps and couldn't be happier.
One of the things Curl talks about in your video is the problem of 7th harmonic distortion with solid state amplifiers.
It's a problem they all have and he has had to overcome it in the design of Parasounds. He says it gives the amps and edgy, amusical sound and has to be avoided.
2nd and 3rd harmonic distortion are musical so they aren't much of a problem.
Any 7th, he says, no matter how little is a killer.
Edits: 06/26/15
What you describe is why I currently do not own a solid state amp and (I'm guessing) part of the reason there are so few women in high end audio. The glare can be brutal but most don't hear it unless their high frequency hearing is still intact.
...nah I hear it in the upper midrange where your ears are more sensitive.
That's probably because my HF hearing rolls off around 12k.
Even the A21 or the older HCA models?
I wonder if that's also why I never liked the Neumann KM84 and AKG C-451E microphones. They both have an edgey "brittle" sound (especially the KM84). (As condenser mics, they have an amplifier built into them.)
:)
"Even the A21 or the older HCA models?"
I never heard the older models. But I did review the JC-1. The JC-1 had bigger issues than just a brittle edge. And yes, I did discuss them with John Curl. In fairness, the amp I reviewed was an early version and I'm sure any issues have now been corrected.
My comments were not targeted at Parasound, but solid state in general based on my experience over the years.
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