Subminiature Vacuum Tubes

Of course the Frog Tube Preamp PCB can be configured with standard 12Ax7 styled preamp tubes, but it is perfect for Russian subminiature vacuum tubes. The PCB is designed specifically for Russian submini tubes.  Both the 6n16b and 6n17b tubes can be used.  See the product documentation and support pages for links to documentation and forums as well as the following diagram.