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Qualiton A20i Stereo Class-A Röhrenverstärker 2x20W

Stereo, Class-A integrated amplifier featuring push-pull circuitry. The rated power output of the appliance is 20 W at the most, each side. The outputs at the rear panel can be connected to 8Ω nominal impedance speakers. The design of the output transformers of the power amp enable to connect the amp with 4Ω nominal impedance speakers as well. This entails a slight deviation from the parameters indicated in the technical data sheet.

At the front panel, the volume control potentiometer and the input selector rotary switch are connected to the same shaft. Indicators informing about the actual state of the amp are located at the front panel too. It can be monitored whether the appliance is ready for operation (if so, the LED next to the volume control turns from red to white light). The user is also informed about the actual position of the input selector unit. The amp is made of solid, 1.5 mm thick, polished stainless steel sheet.


Rated output power                     2 x 20 W, stereo

Total harmonic distortion            < 0.3% (f = 1 kHz, rated output power)

Frequency response                     25 Hz - 100 kHz (-3 dB, rated output power)

Input sensitivity                              230 mV, unbalanced input

Number of input ports                 3 unbalanced input per channel

Number of output ports              1 output terminal pair per channel

Gain                                                 +34.8 dB

Input impedance                           10 kOhm

Nominal load impedance             8 Ohm

Output polarity                              non-inverting

Signal-to-noise ratio                      > 90 dB; output noise less, than 1 mV

Power requirements                     150 W

Tubes required                               4 x Tung-Sol 5881; 2 x Tesla E88CC; 2 x Tungsram ECC83

Weight                                             16 kg

Dimensions                                     27 x 18 x 30 cm