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12AX7 Valve Preamplifier PCB patterns (PDF download) [01111031/2] PDFs with the PCB designs for the 12AX7 Valve Preamplifier (single-sided). The preamp board (01111031) and the power supply board (01111032) are provided in separate PDFs. Cat No SC2937. Price: AUD $3.00 1  Add to trolley Related to: Project: A 12AX7 Valve Audio Preamplifier (November 2003) Project: Using The Valve Preamp In A Hifi System (February 2004) Other items relevant for these projects: A 12AX7 Valve Audio Preamplifier: 12AX7 Valve Audio Preamplifier Main PCB [01111031] ($15.00) 12AX7 Valve Audio Preamplifier Power Supply PCB [01111032] ($15.00)

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