John Curl's Blowtorch preamplifier - Page 1992

jlsem · 27th June 2009, 07:15 PM

Quote:

If you're not going to bother reading the thread, why bother participating,

I'll read this thread when I'm done with the Talmud.

John

SY · 27th June 2009, 07:27 PM

Quote:

Originally posted by jlsem

I'll read this thread when I'm done with the Talmud.

John

Hey, if I could do it, you can too.

john curl · 27th June 2009, 07:31 PM

Hi frequency response apparently has little to do with live vs recorded evaluation.

john curl · 27th June 2009, 07:32 PM

This thread was pretty darn good, up to page 100. After that, ?

scott wurcer · 27th June 2009, 07:40 PM

Quote:

Originally posted by john curl
After that, ?

It certainly seems to amuse some, even some who can't participate. Not that they would want to.

jam · 27th June 2009, 07:43 PM

FrankWW · 27th June 2009, 07:49 PM

Quote:

Nearly anyone who is familiar with the sound of live music can recognize it through a closed door or around a corner outside.

Yes, too much correlated sound in the reproduced sound.

PS. I don't think you guys are having enough fun on this thread and it's a problem

scott wurcer · 27th June 2009, 07:54 PM

John, I hope your new PIM test will explain why you and Dave Wilson chose the 741 third out of a long list of op-amps for his crossover.

Wavebourn · 27th June 2009, 07:56 PM

Quote:

Originally posted by john curl
Hi frequency response apparently has little to do with live vs recorded evaluation.

Because products of intermodulation have as well low frequencies. We've discussed in another thread why 50 KHz microphones capture more real sounds from a drum set that 20 KHz one, and it is well audible that 50 KHz microphones give less of intermodulation on dishes and snares.

john curl · 27th June 2009, 07:58 PM

No, we just found that many IC's sounded worse for whatever reason. We, at least, expressed our results openly and honestly.
For the record, we evaluated the difference between IC op amps in a specific place, and it had NOTHING to do with Crown Equalizer that ultimately had to be updated. It was an OK test, and the results just showed that there is more to bad IC's than just slew rate.
Ultimately, we made special modified IC's, composed of a diff fet input stage coupled into the offset adjust pins of a Raytheon 5534 IC, bypassing the input stage, to replace what Crown originally used. It worked pretty well, but was somewhat noisy. Linear input stage?

27th June 2009, 07:54 PM	#19918
scott wurcer diyAudio Member Join Date: Jan 2004 Location: cambridge ma	John, I hope your new PIM test will explain why you and Dave Wilson chose the 741 third out of a long list of op-amps for his crossover. __________________ 2012, our time is running out.

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27th June 2009, 07:31 PM	#19913
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Hi frequency response apparently has little to do with live vs recorded evaluation.

27th June 2009, 07:32 PM	#19914
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	This thread was pretty darn good, up to page 100. After that, ?

27th June 2009, 07:43 PM	#19916
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA

27th June 2009, 07:58 PM	#19920
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	No, we just found that many IC's sounded worse for whatever reason. We, at least, expressed our results openly and honestly. For the record, we evaluated the difference between IC op amps in a specific place, and it had NOTHING to do with Crown Equalizer that ultimately had to be updated. It was an OK test, and the results just showed that there is more to bad IC's than just slew rate. Ultimately, we made special modified IC's, composed of a diff fet input stage coupled into the offset adjust pins of a Raytheon 5534 IC, bypassing the input stage, to replace what Crown originally used. It worked pretty well, but was somewhat noisy. Linear input stage?

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