The One Bottle is a vacuum tube preamp designed by GroupDIY forum member New York Dave.  According to NYD himself, the preamp is designed to be as linear as possible given the limitations of the circuit.  Being that it’s low-feedback, tube circuit with transformers, however, builders can expect to hear some “color.”

Images courtesy of Fred Gabrsek

Notable Features:

• Based around a single 12AV7 tube
• Transformer-balanced
• 20 dB input pad

Price: no products offered

For more info see:

Freddy G’s build thread

NYD’s original project thread

KHStudio’s build thread