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About the MA3
The Atma-Sphere MA-3 represents the pinnacle of OTL amplifier design, producing 500 watts per channel effortlessly across a wide range of speaker impedances without electronic artifacts. It features a single gain stage, patented direct-coupled output circuit, and automatic bias control, ensuring a direct signal path and exceptional transparency. Class A operation with all-triode configuration, wide bandwidth, low distortion, and unique features like bank-switchable output tubes (1/3, 2/3, or full power), built-in tube testing, panel meters for VU level, tube condition, bias, DC offset, and AC voltages, plus integrated AC line conditioning allowing full power from as low as 100V. Custom components include precision Caddock resistors and tailor-made filter capacitors. Consists of separate amplifier and power supply chassis per channel. Latest version is Mk. 3.3[1][4][6][7][13].
Specifications
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