diyRIAA ? once again

Horexx · 12th May 2008, 04:23 PM

RIAA equalisation has been discussed often. But I am still looking for a special one I have not found yet.

It should be passiv and solid state. Although I like the designs presented by Vacuumstate.com it is not my way because the tubes are too spacy, the preamp will be built into the TT.

Is there a design with a high overload margin as with tubes but in solid state, perhaps FET cascode with high voltage?.
( My system is MM.)

Horexx · 13th May 2008, 12:15 PM

The only solid state preamp with a significant higher supply voltage I know is the Kenwood L-07C (1977). It uses 2 x 47 V.

2 x 2SK68A FET long tailed pair
2 x 2SC1775 cascode
2 x 2SA872 current mirror

It uses active equalisation.

peranders · 13th May 2008, 12:32 PM

I'm in the planning process. See my sig below.

Lumba Ogir · 14th May 2008, 02:42 AM

Hi Horexx,
I`d agree with principles like passive approach, balanced high voltage cascoded J-FET input, no muddy ICs and GNF.

12th May 2008, 04:23 PM	#1
Horexx diyAudio Member Join Date: Dec 2007	diyRIAA ? once again RIAA equalisation has been discussed often. But I am still looking for a special one I have not found yet. It should be passiv and solid state. Although I like the designs presented by Vacuumstate.com it is not my way because the tubes are too spacy, the preamp will be built into the TT. Is there a design with a high overload margin as with tubes but in solid state, perhaps FET cascode with high voltage?. ( My system is MM.)

13th May 2008, 12:32 PM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I'm in the planning process. See my sig below. __________________ /Per-Anders (my first name) or P-A as my friends call me

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13th May 2008, 12:15 PM	#2
Horexx diyAudio Member Join Date: Dec 2007	The only solid state preamp with a significant higher supply voltage I know is the Kenwood L-07C (1977). It uses 2 x 47 V. 2 x 2SK68A FET long tailed pair 2 x 2SC1775 cascode 2 x 2SA872 current mirror It uses active equalisation.

14th May 2008, 02:42 AM	#4
Lumba Ogir Banned Join Date: Apr 2005 Location: Stockholm	Hi Horexx, I`d agree with principles like passive approach, balanced high voltage cascoded J-FET input, no muddy ICs and GNF.

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