QUALITON A50i

QUALITON A50i

Class-A integrated vacuum tube amplifier with an output power of 2 x 50 W. The appliance can be connected to 4 Ω and 8 Ω nominal impedance speakers. The power outputs, based on output pentodes type KT 120, were tuned to the before-mentioned nominal loads through our in-house manufactured, precision winding output transformers. The bias control circuit plays an important role in the operation of the power output too. This curcuit monitors the quiescent current of the output tubes and adjusts it to a preset value. Thus, all four output tubes are in perfectly equal operation states.

Out of three asymmetric and one symmetric inputs, one can choose the desired one using the front panel volume control and input selector rotary switch. The symmetric input features a mini XLR connector. In this case too, the entire volume control and input selector unit is in full harmony with the shiny polished casing of the appliance, bringing together functionality and aesthetics perfectly.

The clearly arranged, minimalistic remote control was designed with this philosophy as well: the unique and aesthetical exterior design was always kept in mind and the usability was improved. Finally, a couple of words on the set of tubes we use: the audio signal arriving on the selected input of the appliance is received by vacuum tubes type Tungsram ECC83. The driving voltage as well as its matching are produced by E88CC/6922s. In power output, the before-mentioned output pentodes KT 120 are in action—strictly in Class-A.  

Warranty: 2 years

User's manual


  • technical parameters
    Name Value
    Rated output power 2 x 50 W, stereo
    Total harmonic distortion < 0.75% (f = 1 kHz, rated output power)
    Frequency response 30 Hz - 100 kHz (-3 dB, rated output power)
    Input sensitivity 425 mV, unbalanced input
    Number of input ports 3 unbalanced input per channel, 1 balanced input per channel
    Number of output ports 1 output terminal pair per channel, 1 line level output per channel
    Gain +33.5 dB (8 Ohm); +25.5 dB (4 Ohm)
    Input impedance 10 kOhm
    Nominal load impedance 4 Ohm and 8 Ohm
    Output polarity non-inverting
    Signal-to-noise ratio > 95 dB; output noise less, than 1 mV
    Power requirements 300 W
    Tubes required 4 x KT120; 4 x E88CC/6922; 2 x Tungsram ECC83
    Weight 25 kg
    Dimensions 35 x 21 x 40 cm

Similar products

Pic
QUALITON A20i
Pic
QUALITON PHONO
Pic
QUALITON MC

CONTACT US

Should you have any question about our products or need any further information, please do not hesitate to contact us at one of the following contacts:  


Hungary, 4400, Nyíregyháza, Nádor street 28.​ 
Opening hours:
M-F 8:00-15:30
Call center opening hours: M-F 8:00-12:00
Phone: +36 42 446-688 
Fax: +36 42 446-688