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26th December 2011, 09:00 PM
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#1 |
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diyAudio Member
Join Date: Jan 2006
Location: Victoria, Australia
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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.
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| "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | | "retro-Oatley 6J6" 6J6 push-pull headphone amp with OPTs | | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp Last edited by mhouston; 26th December 2011 at 09:02 PM. |
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28th December 2011, 11:27 AM
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#3 | |
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diyAudio Member
Join Date: Jan 2006
Location: Victoria, Australia
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