The G9 is a two-channel, discrete, transformer-balanced, tube preamp based on the Gyratek IX.  Gyraf’s website offers free schematics, instructions and PCB layouts.

Images courtesy of Gyraf Audio

Notable Features:

• High-pass filter with “High” and “Low” settings
• Output trim pot
• Switchable line/DI input
• Solid-state power supply

Price:

• 20€ for PCB

More information:

• www.gyraf.dk/gy_pd/g9/g9pd.htm
• PCBs made byPCB Grinder