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matthew2456 28th March 2007 08:24 PM

Basic DIY Valve Phono Stage
 
Can anyone recommend a relatively low cost a good sounding phono stage.......?

phn 28th March 2007 08:29 PM

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

Eli Duttman 28th March 2007 11:20 PM

2 Attachment(s)
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 29th March 2007 12:16 AM

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

Eli Duttman 29th March 2007 12:31 AM

Quote:

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 29th March 2007 04:11 AM

http://www.hagtech.com/images/cornetschem.gif

jh


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