Phasemation SA-1500 Integrated Amplifier

Phasemation SA-1500 Integrated Amplifier A class-A 9 W SET with 2 x 6SN7 and 2 x 300B in a dual-mono configuration Single-ended triode amplifiers are an audiophile Holy Grail, and 300B SETs even more sought after. Add to this, beautiful high-end Japanese design, and you have one of the most desirable amplifiers in the world.  Following the powerful MA-1500 monoblock that uses the revered 300B vacuum tube, Phasemation launched a 300B stereo integrated amp in 2024.  The SA-1500 is a pure class-A self-biased design with an output power of 9 W. Phasemation made four "commitments" when they designed the SA-1500. Commitment 1 was that it must be pure class-A, prioritizing sound quality regardless of the effort it takes. As Phasemation puts it, "Class-A sound is pure, with a delicate expression, and has vast audio advantages due to its low distortion."  Commitment 2 was to not use negative feedback, as Phasemation's extensive listening tests showed that zero feedback made for a more dynamic and expressive sound. Commitment 3 required the use of triode tubes. Phasemation believes there is nothing nostalgic about the sound of vacuum tubes, and that it brings a profound sound impact that can be enjoyed even with modern music. 9 W may not sound like much, and is not much with solid-state, but with tubes and their huge current delivery, 9 W is huge, and can drive a range of loudspeakers. Finally, Commitment 4 was to follow a monaural design structure. By separating left and right channels, Phasemation keeps crosstalk and other cross-channel effects to a minimum, resulting in excellent imaging and stereo separation. Features No feedback design for rich, direct, dynamic sound Individual left and right output transformers made by Lundhal of Sweden Independent left and right choke transformers for less crosstalk  Direct mode allows for use as a power amp Low-noise, anti-vibration design featuring thick glass and rigid aluminum Extensive shielding on power transformer, choke, and output transformer Uses 6SN7 in the first gain stage, with the 300B as the output tube Specifications Input Impedance: 47 kΩ Gain: 30 dB Output Power (THD 5%):  9 W  Output Impedance: 4–8 Ω Power Consumption: 140 W Dimensions (W x H x D): 16.93" x 9.45" x 14.96" (430 x 240 x 380 mm) Weight: 39.68 lb. (18 kg)