John Curl's Blowtorch preamplifier

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#3,461
For many here, while I had darn good hearing all my life, I am now 66 years old. I also used to work for the Grateful Dead, and exposed myself to levels above 120SPL on the stage, and I know this could not have been good for me. However, I usually rely on OTHERS to tell me what I have done, for better or worse, and for long term listening, myself.
I was in Jack Bybee's new Mercedes on Sunday, when an amazing thing happened. While sitting in the passengers seat, an alarm went off that was extremely loud and annoying. Louder than any auto alarm I have ever heard, in fact. Yet, Jack did not even notice it. I asked him what was going on, and then we noted that he had removed his seat belt while the car was running, as we were in a gas line waiting to drive up to the next free pump.
Jack had a NOTCH at that exact frequency range, and he said that he could hear frequencies above that auto alarm. He wants to put a real time analyzer in the car and note the alarm frequency, just out of interest.
 
#3,464
Originally posted by john curl
Jack had a NOTCH at that exact frequency range, and he said that he could hear frequencies above that auto alarm. He wants to put a real time analyzer in the car and note the alarm frequency, just out of interest.
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Not to worry.
The notch is likely just an subconscious decision. It's fully reversible, as is the so-called 'hearing loss'
 
#3,470
When getting to the idea of "Distributed parameter systems" of causality in the quantum considerations of multidimensionality, in which the idea of 2-d stress fields at their oscillating intersect creating inner and outer vortexes in balance and the resultant vector defining 3-d realities or similar effects....then the idea of causality itself is infinitely open ended, as the base premise allows for it, without restriction.
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You have comedian talent, KBK. 😀

Don't forget, there could be real physicists around here reading that.

Have fun, Hannes
 
#3,472
janneman said:



John,

Grey in his latest post 'accused' me of thinking my hearing is better then others, that I am a golden ear. That hurts, because if there is anything I have NEVER claimed it is that.
How can you have confidence in anyone who apparently is not above fabricating arguments out of thin air?

You are of course free to chose your associates, but then must be prepared to be judged by that as well.

Jan Didden
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Post 3421 should qualify for the Bovine With Dysentery award. Truly awe inspiring and next to impossible to challenge. And now your penis is being fantasised about too.
Don't you just love these threads, so volumous in scholarly discussion on the finer details of audio engineering?

:whacko:
 
#3,473
john curl said:
Scott, you should try again to contact Dick Sequerra. Usually you have to wait for him to return your call, so make sure that you at least give your phone number in your message.
In truth, you might get an 'earful' that might shock you. Just ask him how he actually uses your AD797. Ask him about negative feedback. By the way, he sends his regards to you and told me to be easy on you, because you work for a big company and this has effected your perception of the world. (doesn't it always?). Finally, ask him about Jack Bybee and causality. I know that it will be informative and productive to you, and perhaps you and I have more in common than you realize.
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Lighten up there John, show me anywhere I ever criticised any of your designs. Dick has already told me that he likes our data sheets but "op-amps, can't use 'em". I just wanted to give him the serial numbers on my MET 7's and see if there were any component up grades I could do. Yes even I would sub some film caps for non-polar electrolytics if he suggested it.

Have some perspective, this is just audio. Our stuff goes into CT scanners and ulta-sounds too.

Maybe we can get back to amplifiers. BTW, as I said elsewhere, I think the stuff Edmund Stuart is doing in another thread is really first rate and it should be right up your alley, being fully differential input to output.
 
#3,477
Pavel,

I (and I suspect many others) would appreciate if you openend a seperate thread with your measurements on opamp RFI susceptibility... the noise gain stuff you did, with some background on setup details etc. These are very interessting matters, especially that you pulled the LM4562/LME497x0 into pieces...

That is, only if you don't mind to share your results and have the time to do this, of course.

Regards, Klaus
 
#3,479
Scott, I thank you for your recommendation, but so far, I try to avoid threads that are specific, yet so incompatible with my design philosophy. It does me little good to beseech people not to use too much output inductance IF they even use an output coil at all, and it raises the ire of the moderators. (for example)
You are missing a good shot by avoiding asking the important questions of Dick Sequerra. He does indeed use your AD797, but in as special way, not in your app notes. You should talk to him about it.
 
#3,480
john curl said:
Scott, I thank you for your recommendation, but so far, I try to avoid threads that are specific, yet so incompatible with my design philosophy. It does me little good to beseech people not to use too much output inductance IF they even use an output coil at all, and it raises the ire of the moderators. (for example)
You are missing a good shot by avoiding asking the important questions of Dick Sequerra. He does indeed use your AD797, but in as special way, not in your app notes. You should talk to him about it.
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That would be in his mic pre. The specs are pretty damn impressive,
although there is no gain specified.

Sequerra seems like an interesting guy, he has done quite a variety of
things. Even delves into tubes, ribbon transducer and mic design.

I bet he's a very clever chap.

Terry
 
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