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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





T.A.C. 834

 Tube amplifier with great performance that nevertheless never misses out on easiness and musicality. Equiped with 4xEL34 for each channel, this whopper has enough power to reproduce any bass foundation. Over average strong tube power amplifier for price range.
Wonderfully open sound that will carry you away.
Incredibly impulsive and most splendidly arranged bass.

 Looking at the facts first, the 834 is a push-pull design, using two pairs of paralleled EL34s per channel to generate a rather optimistic quoted 120W per channel. These are driven by one 12AX7 (ECC83) and one 12AU7 (ECC82) valve per channel.
The output valves operate in fixed bias mode which, confusingly, means bias needs to be adjusted via preset potentiometers that are accessible in the top panel, in conjunction with a multimeter used on the appropriate test points beside each valve. Input count is four at line level but there is no tape loop facility, and the hefty output transformers have dedicated taps for four and eight Ohms.
Finished in a very pleasing shiny chrome, offset by matt black transformer covers, control knobs and valve covers, the T.A.C. 834 is a very smart device and is sturdily built, as shown by its 25kg weight. Fortunately, it is quite compact, measuring 420x210x270mm (WxHxD), and so it does not consume a vast amount of rack space. Duly sited and warmed up, I was ready to see if it would work any magic on my ears. 
Specifications
Rated Power RMS 4-8 Ohm:  2 x 120 W RMS 8 Ohm
Frequency Range:  20 Hz - 25 kHz +/- 1.5 dB
THD:  < 0,8 % max. (1 kHz, 1 W)
Signal-to-Noise Ratio:  > 89 dB
Input Impedance:  100 kOhm
Speaker Impedance:  4 or 8 Ohm
Tube Pre Amplifier:  6N3
Tube Power Amplifie:r  EL 34
Power Supply:  230 V / 50 Hz
Dimensions (WxHxD):  420 x 210 x 270 mm
Weight:  25 kg

Color:black and chrome
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