John Curl's Blowtorch preamplifier part II

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Sorry, all that detail will not be forthcoming at this late date. I dont even know if I still have some of the gear I used to make tests with any more. Havent seen it in years let alone notes etc. Come on, 30 years ago, man.

I was apparently too optimistic that someone in fashion audio would have actually done some authentic research. Ah well, perhaps I expect too much.
 
It is emerging that a great many audio professionals have significant hearing loss, almost certainly due to overexposure.
Are-you sure ? As far i'm concerned, never had any warning during the mandatory testings of occupational medicine. And, may-be a little more hearing "culture" than average people ?
I was told by a perfume creator that the "Noses", don't have a better sense of smell than the average people. Their ability to can distinguish all the components in a perfume is due to their "culture". They can recognize them, because they know them.
 
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I was apparently too optimistic that someone in fashion audio would have actually done some authentic research. Ah well, perhaps I expect too much.

Yes, too much to ask for too long ago. Now, if you would have contacted me back then..... But, then I was full time busy with co-coordinating projects at LLNL.... could only do audio hobby stuff after work or on weekends.

BTW -- I never worked in any audio until I retired myself from science career.... and then it was straight ahead filters and amps and consulting. I lived off royalties so I can do other things with my life. For example, the power amps and power filters were done on a part time basis. I havent had a full time job since I was in my early 50's.

In Asia I consult and enjoy the life there and live off residuals and from Univ.Calif. retirement and SSecurity...... no longer directly involved but still interested... I shipped a lot of my test gear over to Asia and can do what ever I like in their lab. Work or play as I like. LG. If it isnt fun, I dont do it.



THx-RNMarsh
 
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At a simple hand waving level, continual conditioning of capacitors appears to a factor. The measuring of this is going to be difficult, but purely at a subjective level the performance, as in the reduction of audible distortion, always improves by doing this, for me. How to separate capacitor behaviour variation over time from other factors that alter? Very hard, a major exercise is setting up a decent experimental setup for "proving" it ... one thing, however, is absolutely clear to me: taking one set of measurements, at one point in time will rarely have revealing value - because all these subtle audible behaviours keep altering, over time, for all sorts of reasons. Planting a flag firmly in the ground at some point, and saying, that's it!, will only work when everything is understood ...
 
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