In Reply to: RIAA design dilemma, need your opinions. posted by JLH on February 19, 2002 at 10:46:57:
I'm designing a RIAA preamp myself. I've decided that getting the gain up(no pun intended)to a workable level before I monkey around with the EQ is my best road to venture down. I'm using a cascode. I know they produce more even ordered harmonics but I would rather listen to that than odd ordered harmonics. I'm using an unequal cascode with a hi-mu-high transconductance tube on bottom and a 12AX7 for the grounded grid. This is DC coupled to a second stage common cathode-anode follower which is DC coupled to a cathode follower. There is only one capacitor in the feedback loop and I may get rid of that with a servo amp. Thought I would split up the RIAA part feedback and part passive. The cascode produces enough gain that I can drive just about any passive filter and have plenty left over. PressON!Soldier of fortune James
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Follow Ups
- my opinion- for what it's worth. - j.l.guillebeau@att.net 12:13:35 02/19/02 (0)