ATA-134
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.
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
<1%
Signal-to-noise ratio
>90 dB
Input sensitivity
1.1 V
Number of inputs
2
Input impedance
50 kΩ
Loudspeaker impedance
4–8 Ω
Recommended loudspeaker sensitivity
87 dB/1 W/1 m
Valves in the preamplification stage
6N1P-EV (Russian: 6Н1П-ЕВ) × 2 pcs.
Valves in the power amplification stage
EL34 × 4 pcs
Dimensions (mm)
250 H × 460 W × 380 D
Dimensions (inches)
9⅞" H × 18⅛" W × 15" D
Weight
18 kg/40 lbs