ATA-134 is a stereo tube amplifier, which employs EL34 tubes 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 tube 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.

Technical Specifications

Rated continuous output power

15 W + 15 W (0 dB) Class AB

Frequency range

20–20000 Hz −1.0 dB

Total harmonic distortion


Signal-to-noise ratio

>90 dB

Input sensitivity

1.1 V

Number of inputs


Input impedance

50 kΩ

Loudspeaker impedance

4–8 Ω

Recommended loudspeaker sensitivity

87 dB/1 W/1 m

Tubes in the preamplification stage

6N1P-EV (Russian: 6Н1П-ЕВ) × 2 pcs.

Tubes in the power amplification stage

EL34 × 4 pcs

Dimensions (mm)

250 H × 460 W × 380 D

Dimensions (inches)

9⅞" H × 18⅛" W × 15" D


18 kg/40 lbs