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Mad_K 14th February 2004 06:37 PM

Ultrasimple mm/mc RIAA preamp 2
2 Attachment(s)
This morning I threw together my own version of the "Pacific Riaa Pre". I can now say that I have a completely Single Ended feedback-free amplifier chain (Pacific+BZLS+SOZ) :D And a really nice sounding chain it has become.. This crude little riaa pre is too good to be true. My intention is to tweak it like nothing has been tweaked before (cascoding etc), hence the "fast & furious" building style; it's very effective though (took me about 3 hours to make). All components are matched to the tightest tolerances and to get as close as possible to the ideal riaa values which are 22K4, 3K257 + 97n6, 100R + 33n5.

Well, enough rambling; do yourself a favour and try this circuit! ;)


Mad_K 14th February 2004 06:39 PM

2 Attachment(s)
a little closer on the circuit:

Magura 14th February 2004 06:41 PM

Schematic?????? :)

Sounds almost too good to be it balanced as well??? ;)


Mad_K 14th February 2004 06:41 PM

2 Attachment(s)

Magura 14th February 2004 06:44 PM

YOu know Mads....ill make you a present in the name of the benefit of everybody here and yourself.

I have a typewriter laying around NEED it, so you can have it ;)


Mad_K 14th February 2004 06:47 PM

you're too fast Magura ;)

I forgot to thank Thorsten; I was inspired by his "Pacific Optime" and am going to try his recommendations regarding this circuit. (Ref )

Magura 14th February 2004 06:52 PM


Originally posted by Mad_K
you're too fast Magura ;)

Nope....too slow, i already see your handwriting on the "back o' napkin" schematic ;)

....and guessing didnt do me much good:xeye:


Mad_K 14th February 2004 06:53 PM

Hehe... If you can't read it, you can't build it ;) I could have drawn it in EWB5, but I like to draw on paper. I've got a "diy journal" where I scribble all my efforts. I'm an engineer; I can't think without a pen in my hand and a piece of paper in front of me.

Magura 14th February 2004 06:56 PM

With that could have become a doctor of medicine ;)

Would you mind to translate what youve written about the mosfets. Its a bit unclear to me, but lets blame it on the scanner :)


Mad_K 14th February 2004 07:02 PM

Well, scanning in 150dpi and compressing it to 100KB doesn't help much ;)

Here you go "Fets are 2SK170GR. Idss=4-6mA matched between channels per position."

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