wanted RIAA schematic

[Giaime]

Why? You could use both the triode sections. For example, my circuit (or Thoersten's one, they're similar) can be built with just 1 ECC83 and 1 ECC88 (using both sections) for a stereo phono amp.

Of course maybe I'll add an active linestage after those circuits if I was you...

 

[sam8888ysl]

thanks Giaime,
i'll try this schematic and did you calculate the phono RIAA stage's gain? it can be as a pre-amp or I still need a line stage?
SAM

 

[Giaime]

I would suggest always a line stage after it. Gain is high but many cartridges have low output, or maybe you have an amp with too low input sensitivity, or low-level recordings...

I have to suggest Broskie's Aikido with his own PCB. They're very good, of course I haven't any commercial affiliation with him.

Or maybe, if you want to keep things simple, there are many other active linestages schematics around the net, you could also try the one I've done recently:
http://www.giaime.altervista.org/plate_follower_eng.html

 

[sam8888ysl]

I founf some design have an input CAP maybe 47PF -500PF? should I need to set them? and the valu depands on the first tube's Cag? According to Morgan Johns' books seem the larger Gm the less noise, but the max Gm will rise input Caps of input stage? so any sugest, thanks.

Sam