The Tone Master Princeton Reverb uses digital signal processing to model the circuit of the original Princeton Reverb tube amp, driven by a class D power stage. It is rated at 50W into 8 ohms and is designed to behave like a 12W tube amp. It has a single channel with two 1/4" inputs (Input 2 runs at -6dB) and Volume, Treble, Bass, Reverb, Speed and Intensity controls. Reverb is convolution-based and tremolo is also onboard.

A rear-panel selector offers full power and five attenuated settings, down to 0.3W for low-volume playing. The balanced XLR line out has level control, a ground lift and a three-way IR cabinet simulation switch. With v2 firmware, the amp works with the Tone Master IR Manager app, which provides 45 factory impulse responses with 9 microphone options and loading of third-party IRs. A mute switch is included.

The amp has a 10" Jensen C10R speaker with a ceramic magnet in a lightweight solid pine cabinet covered in black textured vinyl. The power jewel changes colour for power, warmup and mute states. A USB port is used for firmware updates, the power supply accepts 100-240 VAC, and a cover and two-button footswitch come with it.