ATA-134 is a stereo valve amplifier, which employs EL34 valves working in triode mode. The amplifier operates in Class AB without using negative feedback. ATA-134 was designed from scratch and benefits from the use of custom-made transformers designed and manufactured by Audes, including separate filament and High Tension anode toroidal core types with precise winding sectioning and low primary current. Special split-tape-wound-core output transformers, which employ thin high-quality steel, were developed specifically for the ATA-100 valve amplifier series. Only high-quality selected components are used: all resistors are carbon film, and audio circuit capacitors are of PIO (paper in oil) type produced by Jensen.