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Two Stage tube phono preamp
Two Stage tube phono preamp
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Old 26th December 2011, 10:00 PM   #1
mhouston is offline mhouston  Australia
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Default Two Stage tube phono preamp

Not sure this is the right thread but it is titled Phono stage. I just built for a friend a tubecad two stage tube phono preamp. It uses two 12AX7s (I used gold pin Golden Dagrons) with a passive RIAA stage. I built the PS in one Hammond AL enclosure and preamp in another. The PS uses a 24VAC wall wart which is converted to 295V inside the PS by using a 240/24V step down tranni backwards. Two stage filtering C-R-C-R-C. The heaters run DC 12V.

The inter-stage caps in the preamp are Russian PIO and RIAA equalization caps Sprague Orange drops. Both PS and preamp are on Verobard. The preamp sounds excellent but only has sufficient gain for MM carts. You can switch between 100/47K loading.
Attached Images
File Type: jpg Finished brd.jpg (235.7 KB, 270 views)
File Type: jpg Incase.jpg (219.7 KB, 224 views)
File Type: jpg FinishedIII.jpg (344.5 KB, 216 views)
File Type: jpg mockup_II.jpg (217.4 KB, 204 views)
File Type: jpg PS.jpg (237.0 KB, 205 views)

Last edited by mhouston; 26th December 2011 at 10:02 PM.
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Old 28th December 2011, 02:47 AM   #2
Salas is offline Salas  Greece
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Two Stage tube phono preamp
Moved here from Daniel's thread.
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Old 28th December 2011, 12:27 PM   #3
mhouston is offline mhouston  Australia
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Quote:
Originally Posted by Salas View Post
Moved here from Daniel's thread.
Thanks Salas
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