RCA Phono Preamplifier with 12ax7

[fdegrove]

Hi,

I would recommend the 6N2P-EZV as a substitute (not pin to pin compatible) as it is the USSR version of Telefunken's famous ECC808.
(check the datasheet and look at the noise figures for LF application!)

While I am at it, JB from Tubecad recently put up his version of the RCA circuit which is (to my mind) what it should be like.

If there's any interest we could turn it into a dedicated phono pre (MM mostly) with a volume control inserted after the last half of the 12AX7A/6N1P-EV supplemented by a dedicated WCF buffer and a very precise all tubed voltage regulator.

Cheers, 😉

 

[scafas]

rca phono building

I'm also building this preamp and I'm very curious about how it will sound.
I am still confident because the rca electric scheme seems to me to be adopted by many manufacturers even if with small changes to the values ​​of the components.

 

[german]

The MOSFET buffer makes a world of difference. <snip>

Hi from Chile Eli, i want to make this phonopreamp and i´m very interested in to do with your indication on this post but, i´m not sure how to do that, do you have the modified schematic for the final circuit?, please let me know and i hope your answer, thank you very much and greeting from Chile