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ABOUT
AMPLIFIERS
PRESS
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Integrated tubes amplifier WL30-II
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 characteristic
- 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 SPECIFICATION
- output power
.............................................................31W RMS
A-class
- frequency response
...................................................7-62000Hz -3dB
- distortions
..................................................................<0,2%
(1W; 1kHz)
- input impendance
......................................................50 kOhm
- output impendance ....................................................4
or 8 Ohm
- input sensivity
.............................................................70mV
- S/N ratio
......................................................................89dB
- power
input.............................................................. ~315W
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