John Curl's Blowtorch preamplifier part II - Page 32

john curl · 9th July 2009, 09:32 PM

Now, maybe, I can get back to business. :bs: :bs:

anatech · 9th July 2009, 09:37 PM

Hi John,
Weren't you going to post something?

-Chris

Rick Miller · 9th July 2009, 09:40 PM

John, what do you want to discuss next related to your Blowtorch preamp?

john curl · 10th July 2009, 02:01 AM

Still thinking, Rick. It is difficult to convey what I want to say.

anatech · 10th July 2009, 02:21 AM

Hi John,
If you were to design a new preamp with the same ideas, how would you go about it these days?

Not, "it can't be done". The best effort for the current parts availability for production (to avoid small quantities of rare parts). Things like line stage gain, or no gain, but buffered. The phono section, to also build in an MC section so the user can switch it in and out?

On a completely different subject, I was talking to someone yesterday that we have both met and know. He is sure we would hit it off in person. I guess a computer screen does make a large difference. Too bad.

-Chris

john curl · 10th July 2009, 05:14 PM

I would not necessarily do anything different, except make a smaller box, in order to reduce the wire length. When the box was first designed it was made deep in order to accomodate, balanced input, a phono stage, and an output buffer. Very few units got a phono stage, only one balanced input was made, and no output buffers were needed. Therefore, we could have made the case more shallow and reduced the 'clothes line' effect.

anatech · 10th July 2009, 05:27 PM

Hi John,
That makes sense, but how about the devices that are no longer available for production quantities?

The thought is that some manufacturer contacts you to design a new product with more of a mass production plan in place. The best preamp you can come up with, using "in production" parts.

I don't know if the thought had crossed your mind John. Just a plan to start from zero, as if you had no parts on hand yet. Who knows? You may even be able to exceed the performance levels you achieved earlier.

-Chris

PMA · 10th July 2009, 05:33 PM

LIS, but no good P-part available.

anatech · 10th July 2009, 05:43 PM

Hi Pavel,
Please forgive me here. LIS?

-Chris

john curl · 10th July 2009, 06:10 PM

P ch be coming from LS

9th July 2009, 09:37 PM	#312
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi John, Weren't you going to post something? -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

10th July 2009, 02:21 AM	#315
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi John, If you were to design a new preamp with the same ideas, how would you go about it these days? Not, "it can't be done". The best effort for the current parts availability for production (to avoid small quantities of rare parts). Things like line stage gain, or no gain, but buffered. The phono section, to also build in an MC section so the user can switch it in and out? On a completely different subject, I was talking to someone yesterday that we have both met and know. He is sure we would hit it off in person. I guess a computer screen does make a large difference. Too bad. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

10th July 2009, 05:27 PM	#317
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi John, That makes sense, but how about the devices that are no longer available for production quantities? The thought is that some manufacturer contacts you to design a new product with more of a mass production plan in place. The best preamp you can come up with, using "in production" parts. I don't know if the thought had crossed your mind John. Just a plan to start from zero, as if you had no parts on hand yet. Who knows? You may even be able to exceed the performance levels you achieved earlier. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

10th July 2009, 05:43 PM	#319
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Pavel, Please forgive me here. LIS? -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

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9th July 2009, 09:32 PM	#311
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Now, maybe, I can get back to business. :bs: :bs:

9th July 2009, 09:40 PM	#313
Rick Miller diyAudio Member Join Date: Jun 2008 Location: Sarasota, FL	John, what do you want to discuss next related to your Blowtorch preamp?

10th July 2009, 02:01 AM	#314
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Still thinking, Rick. It is difficult to convey what I want to say.

10th July 2009, 05:14 PM	#316
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	I would not necessarily do anything different, except make a smaller box, in order to reduce the wire length. When the box was first designed it was made deep in order to accomodate, balanced input, a phono stage, and an output buffer. Very few units got a phono stage, only one balanced input was made, and no output buffers were needed. Therefore, we could have made the case more shallow and reduced the 'clothes line' effect.

10th July 2009, 05:33 PM	#318
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	LIS, but no good P-part available.

10th July 2009, 06:10 PM	#320
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	P ch be coming from LS

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