Audio Hungary Qualiton Phono was designed from the ground up as a premium category vacuum tube phono stage with extreme low noise and distortion level. It was made to complement the A series of Qualiton products.
The MM card is installed by default. MC card is an extra and cost a bit less then 400 EUR. The slot on the back of the main unit's chassis offer an easy installation of MM and MC cards, for lower and higher impedance cartridges. Any card can easily be swapped with simply unscrewing of the four screws, removing the MM module and with insertion of the MC board into the connector inside of the phono. When module is locked, you only need to tighten it back with the screws.
In the signal transmitting circuit the audio processing is done via Tungsram ECC83, as well as Tesla E88CC double triodes. The standard RIAA correction is implemented with the use of classic passive network between the amplifying stages. No negative feedback is applied with this particular design. The nominal input sensitivity is 5 mV and nominal effective output signal is 500 mV.
The interior of the device has a unique thermal design for optimal cooling and shortest signal path. In order to achieve the lowest possible noise level Audio Hungary team have separated the power supply from the main phono chassis.
With outboard, separated power supply Audio Hungary managed to avoid the negative effects of power supply transformer magnetic field. Along the design process they discover significant benefits with signal-to-noise ratio and with better, more involving musical experience, when power supply was farer away from the signal circuit.
THE Qualiton Phono preamplifier uses passive RIAA correction and its accuracy was repeatedly measured and checked on the Rohde & Schwarz UPV Audio Analyzer. The dual mono structure delivers the output level of the left and right channel operation within 0.5dB.
Interestingly, both power transformer and the MC transformers are made in Audio Hungary own factory. Step up transformer uses unique 30 years old lacquered copper wires, that were left as a stock at the Audio Hungary former company. The MC transformers bobbins are made from bakelite and the core constitute of special material alloy with high μ value. Power and MC transformers double shielded and lowers the noise due to stray field of power transformer.
The stabilised power supply is separated not only for the lower noise but also to deliver better thermal operation. Both units are connected to the military grade power supply connectors.
And the most important part... There are only tubes in a signal path. Audio Hungary has chosen a premium selection of NOS Tungsram ECC83 and Tungsram (or Gold Lion) E88CC valves.
Nominal output level
Input sensitivity - with MM card
5 mV, to nominal output level
Input sensitivity - with MC card
0.4 mV, to nominal output level
Number of input ports
1 MM-level input per channel,
or optionally 1 MC-level input per channel
Number of output ports
1 line level output per channel, with 500 mV nominal output level
Max. input signal - with MM card
Max. input signal - with MC card
Gain - with MM card
+40 dB, (f = 1 kHz)
Gain - with MC card
+62 dB, (f = 1 kHz)
Total harmonic distortion - with MM card
< 0.07%, (f = 1 kHz, input level: 5 mV)
Total harmonic distortion - with MC card
< 0.2%, (f = 1 kHz, input level: 0.4 mV)
20 Hz - 20 kHz, (-0.3 dB)
Input impedance - with MM card
Input impedance - with MC card
Signal-to-noise ratio - with MM card
> 70 dB
Signal-to-noise ratio - with MC card
> 65 dB
4 x Tungsram ECC83; 2 x Tesla E88CC
35 x 8 x 30 cm