HI-FI Class A stereo tube preamplifier module

Features

• HENGPEN-637
  
• Power supply 6.3 Volt ac (valve filament)
  
• Power supply 180-0-180 Volt ac (anodic valves)
  
• 8 Volt ac power supply (negative grid)
  
• High impedance input
  
• Size mm 170x110x90
  
• Mounts a 6Z4 rectifier valve,
  
• Two 6N3 J pre-amp double triodes,
  
• Two transistors and a voltage stabilizer.