I was surfing the net trying to get a handle on RIAA. Still in search of a book that breaks it down piece by piece. Well in my searching I ran accross Steve Bench's new phono stage.It uses a 9206,1660,and 1623 per channel. No caps in the signal path and uses some pent valves.
Kevin or anyone have you heard anything about it or ideas on the layout. You can see the diagram on his website. It seems like interesting idea with all the iron.
Thanks Tom
Follow Ups:
- Phono stage design links - Tom Ronan 19:30:41 11/11/04
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- In Reply to: Here is a phono pre with some Lundahl iron!!! posted by TomWh on October 15, 2004 at 10:04:45:
Hi Tom, another Tom here.
This little primer is by Simon Shilton of SJS Electroacoustics in the UK. It made everything clear for me, even good enough that I built some excel files to calculate the time constants and now use them to mock up any phono stages I build.
Don't forget to calculate the series resistance of the tube as part of your RIAA eq. Different tubes (even of the 'same' type) have different plate resistances (Rp) (like ECC35 vs. 6SL7) and their Rp's change with operating point. Look at the Western Electric tube curves for various tubes, and you'll see what I mean.
Hope that helps,
Tom
- Phono Calcs - Horn Jockey 18:42:24 10/15/04
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- In Reply to: Here is a phono pre with some Lundahl iron!!! posted by TomWh on October 15, 2004 at 10:04:45:
The book that helped me design phono stages the most was "Valve Amplifiers" by Morgan Jones.
If you can get a copy, also try Sound Practices Volume 1, #3 and read the article on the Siren Song by J.C. Morrison.
Best of luck,
Brian
- Re: Here is a phono pre with some Lundahl iron!!! - KevinC 11:15:16 10/15/04
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- In Reply to: Here is a phono pre with some Lundahl iron!!! posted by TomWh on October 15, 2004 at 10:04:45:
Tom,
When I was in California in June I stopped by Steve's to listen to his phono preamp and "matrix" amp. Of course, his system was completely foreign to me, but his capacitor-less phono preamp immediately impressed me mightily in two respects: detail recovery (resolution) and noise. The frequency balance also seemed to be good. I think his approach is an excellent one and bears further attention.
The chassis was very compact. Steve wired everything point-to-point almost like a geometric puzzle. You might contact him through his webpage if you have further questions.
Kevin Carter
K&K Audio
www.kandkaudio.com
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