Typically, tube amps use one or more dual triodes in the preamplifier section to provide sufficient voltage gain to offset tone control losses and drive the power amplifier section.
22.
These amplifiers amplify the voltage between the active electrode and the reference ( typically 1, 000 100, 000 times, or 60 100 dB of voltage gain ).
23.
A graph of a filter's gain magnitude, illustrating the concept of " 3 dB at a voltage gain of 0.707 or half-power bandwidth.
24.
If the IF amplifier needed a voltage gain of 10, 000, then it would need only two stages with an IF at 1 MHz but four stages at 10 MHz.
25.
That is, large voltage gain requires large " R C ", and that in turn implies a large DC voltage drop across " R C ".
26.
In the field of audio and general purpose amplifiers, especially operational amplifiers, the term usually refers to voltage gain, but in radio frequency amplifiers it usually refers to power gain.
27.
This loss of voltage gain is recovered by the upper FET . Thus, the upper transistor permits the lower FET to operate with minimum negative ( Miller ) feedback, improving its bandwidth.
28.
In the circuit shown, the NPN emitter-follower and the PNP emitter-follower will generally have very slightly different voltage gains, leading to slightly different gains above and below ground.
29.
For voltage amplification, the range of allowed output voltage swing in this amplifier is tied to voltage gain when a resistor load " R C " is employed, as in Figure 1.
30.
Because of negative feedback ( the cathode-ground voltage cancels the grid-ground voltage ) the voltage gain is close to unity and the output voltage " follows " the grid voltage.
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