tube preamp.pdf

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UTB ve Zlíně, Fakulta aplikované informatiky 62COCLUSIOThis stand-alone preamplifier design uses a novel design approach, in which modernop-amp design techniques are combined with classic vacuum-tube knowledge. Producinga circuit that represents a significant improvement over most classic audiophile tubedesigns. As mentioned before, this circit provides us with great variability of it’s utilization.By simple changing the circuit in the feedback, we can achieve this preamplifier to beused as phono – ceramic, microphone or spring reverb preamp to name a few.As hinted already, this circuit behaves very much like an operational amplifier (opamp).But we'll point out the ways here in which it is like an op-amp. Open loop gain,although quite high, cannot be considered infinite as in many solid state opamp device.The circuit exhibits a large output-to-input voltage offset (on the order of 290volts). Any AC feedback elements between output and input therefore have to include DCblocking capacitors. The alternative would be level-shifters, which would result in additionalcomplication (and expense) without commensurate rewards in terms of performance.The DC voltage at the feedback input is non-zero (about 27 volts in practise), soagain there is a need for DC blocking capacitors. Virtual AC ground between R113 andC104 is provided for convenience, acting as a virtual ground for AC, at the same DCvoltage as the inverting input.As mentioned in the Introduction, the perfect audio Chain doesn’t exist. Mankindis still limited by its technical capabilities, which makes the perfect reproduction impossible.Listening to the favourite tune in our listening room can be called an experiment in atechnical way. The output of our “experiment” is judged, again, by a man. The sameexperiment will be wieved from a different point by another man. If we changed thelistening room, it equals to different input conditions. Listening to music of all kind isstrictly subjective perception and cannot be analytically described using math equations. Inthe same manner, technically unadvanced and fairly imperfect design using vacuum tubescan in the conclusion sound better to the human ear.
UTB ve Zlíně, Fakulta aplikované informatiky 63SEZAM POUŽITÉ LITERATURY[1] Láníček,R.: Elektronika,obvody,součástky a děje. Praha,BEN,1998.[2] katalog EZK Rožnov pod Radhoštěm,2007.[3] Příruční katalog TESLA, Rožnov pod Radhoštěm,1977.[4] VLACH, J. : Lampárna, aneb co to zkusit s elektronkami? Praha,BEN,2004.[5] Muzikus 05/2003, CHROBÁK,M.: Elektronky v kytarových zesilovačích[6] www.dogstar.dantimax.dk[7] www.aldax.cz[8] www.zesilovace.cz[9] HRABOVSKÝ,M.: Eagle pro začátečníky, Praha,BEN,2002.
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