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I just looked at the manual at BAMA. There is a discrepancy between the schematic and the rest of the manual. The photo of the unit and the tube compliment show 9 tubes. The schematic shows 10 tubes! The extra tube being a 6BJ7, a triple diode used to clamp three separate points in the circuit. Good luck with sorting it out. BTW, the 5963 tube is just a 12AU7 that performs better at switching.
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