Vacuum Tube Preamp Built Into Sa6600 Self-Made Fully

  
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Vacuum tube preamplifier built into a Pioneer SA6600 pre-main. The operation part of the pre-main was utilized, and 6 vacuum tubes, 2 tubes 6N2P (X7 equivalent 6V bulb), 2 tubes 12AU72, 2 tubes 12FQ7 were used, not to mention the heater circuit. In addition, the contacts of the signal cut relay are connected in parallel until the amp operation stabilizes to avoid unstable operation that may affect the sound.

The hood has dirt and scratches, so it has been painted. There are some scratches and stains.