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12AX7 Valve Audio Preamplifier Power Supply PCB [01111032] Power Supply PCB for the 12AX7 Valve Audio Preamplifier. Suitable for both the original Valve Preamplifier (November 2003) and the Hifi version (February 2004). Double-sided PCB with plated through holes, solder mask and silkscreen overlay. 125 x 62mm. Cat No SC0691. Price: AUD $10.00 1  Add to trolley In stock: yes (27 available). Estimated dispatch time: 1-3 days Related to: Project: A 12AX7 Valve Audio Preamplifier (November 2003 [print issue] [online issue]) Project: Using The Valve Preamp In A Hifi System (February 2004 [print issue] [online issue]) Other items relevant to these projects: A 12AX7 Valve Audio Preamplifier: 12AX7 Valve Audio Preamplifier Main PCB [01111031] ($10.00) Add to trolley ETD29 transformer components ($15.00) Add to trolley 12AX7 Valve Preamplifier PCB patterns (PDF download) [01111031/2] (Free) Add to trolley