Because plate voltages can be as high as 300DC, multiple B batteries may be connected together in series to additively provide the required operating voltages.
12.
Modern circuits using semiconductors, or high-gain vacuum tubes with plate voltage as low as 12V, typically operate at milliwatt levels one thousand times lower.
13.
De Forest's initial Audions did not have a high vacuum and developed a blue glow at modest plate voltages; De Forest improved the vacuum for Federal Telegraph.
14.
Vacuum tube coils typically operate with plate voltages between 1500 and 6000 volts, while most spark gap coils operate with primary voltages of 6, 000 to 25, 000 volts.
15.
In normal operation the screen grid is connected to a positive DC voltage slightly less than the plate voltage, and bypassed to the cathode with a capacitor, so it was at AC ground.
16.
The radio used a plate voltage of 160 to 170 volts directly from the AC power line; the rectifier, while not needed with a strictly DC supply, did not cause a problem.
17.
This causes a downward " kink " in the plate current vs . plate voltage curve " ( graph below, grey region ) " when the screen grid is biased at a higher voltage than the plate, as described below.
18.
Power is necessary for establishing the capacitor plate voltage, and is also needed to power the microphone electronics ( impedance conversion in the case of electret and DC-polarized microphones, demodulation or detection in the case of RF / HF microphones ).
19.
Other reasons for using a top cap include improving stability by reducing grid-to-anode capacitance, improved high-frequency performance, keeping a very high plate voltage away from lower voltages, and accommodating one more electrode than allowed by the base.
20.
The 807 is not a good choice of tube for typical Ultra-Linear amplifier circuits, as the maximum screen voltage at 300 V is less than half the maximum plate voltage of 750 V . A possible solution is to use an output transformer with a separate ultralinear screen winding, such as the Acrosound TO-350.
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