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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Amplifon WT 30 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.
Amplifon WT 30II Features:
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 triodes 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
SPECIFICATIONS:
 Power Output:  31 W RMS A-class
Frequency Response:  7 - 62,000Hz -3 dB
Distortions:  less than 0,2% (1W; 1kHz)
Input Impendance:  50 k Ω
Output Impendance:  4 Ω or 8 Ω
Input Sensivity:  270 mV
Signal-to-Noise Ratio:  89 dB
Power Supply:  AC 220 - 240 V, 50 Hz
Power Consumption:  ~315 W 
Dimensions (W xH x D):  435 x 280 x 430 mm
Weight: 16,8 kg
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