"All American" RIAA Preamp - Page 4

EC8010 · 22nd January 2008, 06:11 PM

I posted the J110 curves merely as a point of interest. As you say, at lower levels, linearity will be less of a problem. Here's an LSK170 for comparison.

SY · 22nd January 2008, 06:34 PM

Well, that's very nice. At 8mA, the transconductance seems to be 25-30 mA/V and the curve spacing is relatively even. I assume you picked those constant voltage points with a cascode in mind?

EC8010 · 22nd January 2008, 08:35 PM

Quote:

Originally posted by SY
I assume you picked those constant voltage points with a cascode in mind?

Oh yes.

wrenchone · 13th March 2008, 07:05 AM

I'm just about finsihed a new layout of the "All American" board, changing the PNP bipolar transistors from 2SA965 to MPSW56 and substit\uting a new fast shunt regulator for the series regulator used on the original board. If anyone is curious about the new regulator, I'll post a link to the thread in the solid state forum - simulations looked very promising.. This will all go in a new case with a discrete active crossover so I can ditch my discrete crossovers and go biamp. In the process f stuffing the new board, I can develop an post a selection metod for the fets I'm using for the gain stages.

22nd January 2008, 06:34 PM	#32
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Well, that's very nice. At 8mA, the transconductance seems to be 25-30 mA/V and the curve spacing is relatively even. I assume you picked those constant voltage points with a cascode in mind? __________________ “There are no greater liars in the world than quacks, except for their patients.” - Benjamin Franklin

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13th March 2008, 07:05 AM	#34
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	I'm just about finsihed a new layout of the "All American" board, changing the PNP bipolar transistors from 2SA965 to MPSW56 and substit\uting a new fast shunt regulator for the series regulator used on the original board. If anyone is curious about the new regulator, I'll post a link to the thread in the solid state forum - simulations looked very promising.. This will all go in a new case with a discrete active crossover so I can ditch my discrete crossovers and go biamp. In the process f stuffing the new board, I can develop an post a selection metod for the fets I'm using for the gain stages.

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