My Phono Stage Project

Circuit design by Cornelius Morton 

Circuit 
I wanted to attempt a phono preamp, knowing it would be a difficult task since noise can be a real problem with the high gain required by a phono preamp. 

My friend, Con designed a phono circuit and I went to work . The original circuit used one 6DJ8 and 1/2 of a 12AU7 per channel. The sound was good but I wanted more gain so the circuit was modified to use both halves of the 12AU7's.

Now the gain was great, the sound was great and the noise is low.  

  


Separate tube rectified, DC, regulated power supply

 

Power Supply Circuit

Phono Circuit

The Pair Powered UP!

Listening Tests