The A3 is a 300B Single-Ended Triode design, which produces an effortless synergy with the performance of our loudspeakers. Drawing strong references from the design language of the speakers, the solid hardwood and brass detailed chassis is a perfect compliment to our cabinetry. The hand-polished, quarter-inch thick brass top plate is not just a striking visual statement. Weighing in at 36 pounds, it likewise provides an incredibly high-mass foundation for vibration-sensitive vacuum tubes.

The C3M tube at the core of the gain stage was originally created as a “no compromise” design by the German Post, for telephony use. It possesses better drive capability and specifications than tubes typically paired with a 300B. Combined with a large Finemet-core interstage transformer, the A3 has an input sensitivity of 1.6VRMS, allowing it to be connected directly to source components. That large interstage and an over-spec Finemet output transformer produces a very wide frequency response. Unique circuitry choices increase damping factor as well, allowing the A3 to exhibit excellent bass control in a single-ended design.

It features a stout power supply with excess capacity, and 5AR4 / GZ34 DC rectification. The CLCLC configuration of both film, oil and Mundorf HV+ capacitors smooths and cleans the high voltage power feeding the audio circuit. Due to the nature in which the tube heater circuit and audio circuit interact in the 300B, filament noise can be problematic. However in this design, regulated DC heater circuits minimize DHT filament noise, and ensure long tube lifespan.

A large brass volume knob at the center of the Songer A3 allows for precise volume level control. An Elma attenuator, utilizing discrete resistors for each level of attenuation, minimizes the loss of sonic information, and maintains excellent balance between channels. A remote control allows the listener to adjust to taste from their listening position of choice.

The A3 is designed and produced in collaboration with Treehaus Audiolab, of Southport, CT. Like Songer, Treehaus takes inspiration from the earliest and most revered audio designs, elevated in the A3 through contemporary knowledge to create an amplifier that possesses the magic of vacuum tube amplifiers, without compromises.