Basic DIY Valve Phono Stage

[matthew2456]

Can anyone recommend a relatively low cost a good sounding phono stage.......?

[phn]

http://www.geocities.com/rjm003.geo/.../diy_pho3.html

[Eli Duttman]

There's always the "classic" RCA design, which is seminal to all passive designs. You'll need to add a buffering voltage follower if a stand alone project is what you have in mind.

No matter which design you settle on, a DC heater supply is a must.



Edit: fixed typo

[dsavitsk]

Is a 12ax7 close enough to use in this circuit, or is the 7025 essential?

[Eli Duttman]

Originally posted by dsavitsk
Is a 12ax7 close enough to use in this circuit, or is the 7025 essential?

With DC heating, 12AX7s are FINE. The 7025 is a 12AX7 with a spiral wound hum bucking heater. The current production Sovtek 12AX7LPS is a 7025 equivalent.

While you MIGHT be OK using AC heating on the 'LPS, why take the chance, when setting up a 7812 regulated heater supply is really easy.

[hagtech]

jh