51x Gyraf G9 Tube Preamp

Projects > 51x Gyraf G9 Tube Preamp

GroupDIY member Gemini86 has adapted Gyraf’s highly-regarded G9 tube preamp to the 51x Alliance format.



  • Input transformer options:
    • Cinemag CM-75101APC
    • Lundahl LL1528
    • Ed Anderson EA2622
    • OEP A262A3E
  • Output transformer options:
    • Lundahl LL5402
    • OEP
  • High-pass filter 50Hz/150Hz
  • Phase switch

Price: $18 for PCB

More info: