ATA-234R is a stereo tube amplifier combining a powerful sound, excellent reliability and ease of use by utilising push-pull Class AB ultra-linear circuitry and automatic biasing. ATA-234R 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 transformers with a precise winding sectioning and a low primary current. Special flat-type UI core output transformers were developed specifically for the ATA-200 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.

Technical Specifications

Rated continuous output power

30 W + 30 W (0 dB) Class AB

Frequency range

20–20000 Hz −1.0 dB

Total harmonic distortion


Signal-to-noise ratio

>90 dB

Input sensitivity

0.775 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)

200 H × 470 W × 400 D

Dimensions (inches)

7⅞" H × 18½" W × 15¾" D


23 kg/51 lbs