John Curl's Blowtorch preamplifier part II

[john curl]

I find it most useful to buy used amps and then modify them, IF they need it. I would not build an automobile from spare parts, either.

 

[SY]

I find it most useful to buy used amps and then modify them, IF they need it. I would not build an automobile from spare parts, either.

Fortunately, there are lots of bright and motivated people who want to go beyond being appliance buyers. Not your target market, in fact it's antithetical, so I can understand the sour grapes.

 

[PMA]

These old AP1 measurements are useless to evaluate high order harmonics below -100dB.

 

[john curl]

Really? Professionally engineering an audio amp is making an 'appliance'? OK SY go for a 1000W power amp in your spare time. '-)
'Piece of cake!'

 

[john curl]

The JC-1 power amp does not have distortion artifacts spaced at every 1KHz. Why?

 

[SY]

Professionally engineering an audio amp is making an 'appliance'?

Precisely.

ap·pli·ance
əˈplīəns/
noun
1. a device or piece of equipment designed to perform a specific task, typically a domestic one.

 

[Kastor L]

A Ferrari is an appliance then.

 

[john curl]

Yep!

 

[a.wayne]

The fact Sy refers to others he disagrees with as chimps says alot....

 

[PMA]

The JC-1 power amp does not have distortion artifacts spaced at every 1KHz. Why?

Don't say so.

http://www.stereophile.com/images/archivesart/JC1FIG5.jpg

 

[SY]

A Ferrari is an appliance then.

You drive yours in the house? My hat's off to you, sir.

 

[john curl]

Like me, for example. I can just guess what he says behind my back. 'design chimp' in residence.

 

[a.wayne]

Don't say so.

http://www.stereophile.com/images/archivesart/JC1FIG5.jpg

It's near clipping , the Great one said thats expected....

 

[john curl]

As SY and others said, this particular test using 50 Hz is not necessarily very good below 100dB. If you can do better PMA, please do so or show us how.

 

[canyoncruz]

Hey, it is one think to build a Corvette from scratch and another to modify one and improve its performance. The Israelis do it with our jet fighters. In fact Iron Dome is an Israeli modded Patriot system.

John: What about Corey Greenberg? I had a distribute from Asia tell me my product would be hard to sell because cable companies make up the majority of advertisement revenue for audio rags. The analog fiber optic interconnect did outperform many cables out to 5 kilometers of so. It was based on a fiber optic hydrophone system for submarines. Stereophile just refused to review it. Cutting edge, eh?

 

[PMA]

I told you not to consider AP1 below -100dB. And please stop permanent boasting and humiliating competitors (Crown). BTW, JC1 has high 2nd.

 

[john curl]

Did anyone listen to it? (the optical cable)

 

[john curl]

I am designing out the 2'nd harmonic distortion in the next generation of JC-1. Doubt that it will make any sonic difference.

 

[john curl]

I have little interest in what Crown makes. I did not put it up here. Still, I am not surprised that some reviewers did not like its sound.

 

[DF96]

I know, it's nuts, but some of us really do like to design and build ourselves rather than worry about brands and nameplates.

Is that what "DIY" means - I thought it means ask someone else what commercial equipment I should like, then ask what I should do to 'recap' it so that it sounds like what someone else prefers, then throw it away and start again when my wife in the kitchen says she doesn't like it. Am I on the right forum?