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The WT 30-II amplifier is the first device constructed in AMPLIFON AUDIO
company, based on triodes operating in the A-class. The leading idea during
designing this amplifier, was to construct a device with perfect sound features,
but devoid of typical limitations of electron-tube amplifiers.
Due to the application of a durable and current-efficient double power-triodes
6N13C we got the output power coming to 31 W in the A-class and a relatively
high resistance to a load changes. The low impedance of the power-triodes and
the modern deka-sectional triodal output-transformers secure for the wide
transfer band with the small extent dependent on the output power.
Very interesting is the system of the power-tube polarization, securing for the
direct quiescent current of the power-tubes, independent from the strain ageing
effect or from the changes of the power voltage. Apart from its basic functions,
this system secure also for the lack of any regulations not only during the
exploitation but also during the tube's exchange.
BASIC CHARACTERISTICS:
- integrated electron-tube amplifier based only on tubes operating in the pure
A-class without returnable compression
- automatic regulation of the power-tubes' quiescent currents
- three linear inputs
- triodal input system on the 5963 Philips JAN tube (ECC82; 12AU7; 5814)
- triodal operating system on the 6N1P-EW tube
- push-pull output stage, based on the double tiodes 6N13S (6AS7; 6080)
operating in the A-class in the parallel push-pull system
- deka-sectional triodal output transformers adapted to work with 4- i 8-ohm
speakers groups
- completely separated rectifiers and power supplier's filters for the left and
the right channel
- automatic, delayed switching on of the anode voltage with 'Stand by' function
TECHNICAL SPECIFICATIONS:
- output power 31W RMS A-class
- frequency response 7-62000Hz -3dB
- distortions <0,2% (1W; 1kHz)
- input impendance 50(
- output impendance 4 or 8(
- input sensivity 270mV
- S/N ratio 89dB
- power input ~315W
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