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Old 28th March 2007, 08:24 PM   #1
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Default Basic DIY Valve Phono Stage

Can anyone recommend a relatively low cost a good sounding phono stage.......?
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Old 28th March 2007, 08:29 PM   #2
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http://www.geocities.com/rjm003.geo/.../diy_pho3.html
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Old 28th March 2007, 11:20 PM   #3
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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.



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Old 29th March 2007, 12:16 AM   #4
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Is a 12ax7 close enough to use in this circuit, or is the 7025 essential?
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Old 29th March 2007, 12:31 AM   #5
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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.
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Old 29th March 2007, 04:11 AM   #6
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