FET TRANSISTOR VS VACUUM PORTABLE
FET TRANSISTOR VS VACUUM FREE

Depending on the type of the transistor in the channel move charge carriers., Free electrons or “holes” (non-filled space in the crystal lattice) As the lamp transistor, the output current of the FET (drain current) is controlled by the voltage between the gate and source. Conductive part of the transistor is a channel in the ultrapure silicon crystals, the conductivity type of which (p or n) is given an insignificant admixture of indium and arsenic. The field effect transistor can also be viewed as a “conductor”.

The dependence of the internal resistance based on the reverse slope of the anode current of the transistor of this current, therefore, in a state in which the load resistance is greater than the internal resistance, increased lamp is virtually independent of the anode current. Another important advantage is the transistor – low internal resistance, which is at optimum mode of lamp use smaller load resistance is approximately twice. It is also important that the main parameters of the lamp is not dependent on the temperature of the anode or otherwise, from the power allocated to it. Interelectrode capacitance are constant and independent of the electric lamp modes. The influence of the characteristics of the input valve linearity can be neglected, since the negative bias current in the grid mode, it is not a chain. It is particularly important that the slope of the transistor depends little on the anode current (in most cases, it is proportional to approximately the top of the 3rd degree of the magnitude of this current).

The independence of the steepness of the electric lamp switch is an indicator of its linearity.

FET TRANSISTOR VS VACUUM PORTABLE

Portable vacuum through the free electrons of the anode current is controlled by the voltage between the grid and the cathode.Īmplifying transistor properties can be characterized by the steepness of the characteristics, that is, the current increment to the increment ratio of anode voltage “grid – cathode” (at a constant voltage at the anode). Lamp (take as an example a triode) can be regarded as a “guide”, which consists of carefully purified oxygen electrodes – an anode and cathode – as well as the vacuum gap between them is filled with charge carriers – energy excited free electrons. To just not into mysticism, look at the physical level, the difference between the lamp, field and bipolar transistors. In the difficult moments of the presentation – and of course they will – I will now familiar to the reader objectivist. Is it really? Does the lamp advantages over the transistor, and if so, they are shown under what conditions? The answers you will find in this article. Perhaps that is why many audiophiles arose suspicion that transistors bring on “damage” to the sound of music, and that even a simple home-tube amplifier transistor is able to remove the “evil eye” and “clean” from his transistor made previously, and even digital recording. Please note that none of the above sounds good recipes in tube amplifiers have never been implemented. By the mid 80-ies in vogue modest “by the numbers” amplifiers lamps. Many became clear that to what is written in the advertisement should be treated with caution and can only believe his own ears, or at least the ears of qualified experts.Īfter the games in the era sverhparametry subjectivity.

However, a gold mine, it seems, is still dried up. So far managed to maintain adiofilov have faith in all these technical “troubles”, reigned revival in the amplifier market. – Speaker requires more power (and that’s a lot of output transistors connected in parallel provide a current output amplifier 100 A). – Amplifiers limit the speed of signal change (on the front panel of new amplifiers appeared the inscription “High Speed Amplifier “) – Not wide enough band Frequency (band has been extended to 5 MHz) – Small damping coefficient (damping ratio reached 1000) – Too high harmonic distortion (in new models distortion amplifiers reduced to 0.0001%) For many years, manufacturers transistor amplifiers audiophile led by the nose by offering a plausible explanation for why should an old amp model is replaced by a new one.

Fet transistor vs vacuum