Electronic tube filament ----- Vacuum Tube Power Supply

Electronic tube filament, Vacuum Tube Power Supply Keywords: filament power supply Simplely said that the action of the tube filament is to heat the cathode, making the cathode electron easily escape the cathode to fly to the anode, so that the electronic tube is working properly (also the filament of the tube is also a cathode, "said straight-heat tube). Therefore, the popular tandem's filaments are like a device that is converted into an internal energy like an electric furnace! Be Therefore, the filament can be supplied with direct current (DC) or power supply (AC)! Be DC is small, but has a certain effect on the life of the pipe (substantially only in a straight thermal tube), and the cost of circuit is increased. Be The AC power supply has no effect on the life of the pipe, the circuit is simple, but it is easy to cause noise. Be Since both are not taken into account, when is the DC power supply, when is AC power supply? Be In general, the pre-stage tube gain is large, such as the commonly used 12AX7 or 6ax7 μ value is nearly 100, the gain is very large, and the magnification of the magnifying circuit is more than 50 times, such as the two-stage magnification, magnification is 50 × 50 = 2500 times. Therefore, the preamplifier is very important, especially the distortion circuits made of tubes, and small noise interference will be enlarged as a significant exchange. Therefore, the filaments must be powered by DC! Of course, there are many factors that cause noise, such as the processing of ground lines. Be In general, the post-stage tube gain is small, the current is large, and the power is mainly amplified. Moreover, the filament current is also relatively large, and the rectifier regulation is relatively complicated. Therefore, AC is often powered.

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