The Adaptation of the Three Electrode Vacuum Tube Amplifier to Ear-phone Instruments |
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adjusted amplification anode audibility batteries becomes calculated capacity cathode cause cells characteristics charge circuit consider considerable constant constructed curve depends designed determined diaphram dimensions discharge discussion distance distortion dry cells ear-phone effect Electric electrons elements equal equation existing experimentally expression external Figure FORM give given grid potential grid voltage important inches increase input Inside diameter instrument limiting magnetic transmitter Material maximum means Milliamperes necessary noise number of turns obtained ohms operation output particular phones phonograph plane plate current plate voltage possible practically produce radius relation resistance resonance respect satisfactory saturation current seems shown sound space Specifications speech structure surface temperature tion transmitter Tube 04 TUBE NUMBER Type UNIVERSITY vacuum tube variation various volts wire wire Length zero
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Page 62 - It is impossible to state their ampere-hour capacity. as is done for storage batteries. because so much depends on the condition of the cells. the way they are made.
Page 24 - VIII. AMPLIFICATION EQUATIONS OF THE THERMIONIC AMPLIFIER. On the strength of the two assumptions discussed in the previous paragraph, namely, that the amplification is independent of the input and the frequency, it is possible to derive the equations of amplification...
Page 34 - Furthermore, let us suppose that the difference of potential Ep' when applied to the structure without the grid produces a certain charge density e on the cathode, and that the difference of potential Ep" when applied between anode and cathode of the other structure (the grid being held at the same potential as the cathode) produces the same charge density e on that cathode. Since OC •v NOMBEE.
Page 20 - Filament currents below this value correspond to the saturation part of the curve giving the plate current as a function of the plate potential.
Page 24 - ... \g , where g is the positive voltage which the grid can acquire without taking enough current to cause distortion. Another condition is that the input voltage must not exceed the value given by df (Fig. 6) ; otherwise the negative peaks of the output current wave will be chopped off. Now cd is given by yEB + e.
Page 63 - Table n below for No. 6 cells. It is seen that to obtain the same amount of energy at the higher rates of discharge it is necessary to carry the voltage to a lower point than is the case for smaller rates of discharge. TABLE 11.— Energy Delivered by Dry Cell When Discharging Continuously Through Various Resistances to Various End Points [Expressed as watt.hours] 63 Just as the voltage is not a criterion of the service capacity remaining in the cell.
Page 63 - ... one-half discharged. The true measure of discharge of the cell is the ratio of the energy delivered to the total energy contained, and this must be measured in watt-hours.
Page 21 - ... evacuation. VII. CHARACTERISTIC OF CIRCUIT CONTAINING THERMIONIC AMPLIFIER AND OHMIC RESISTANCE IN SERIES. In discussing the behavior of the thermionic amplifier in an alternating current circuit, we shall make two assumptions: First. The alternating current established in the circuit FPER (Fig. 5) is a linear function of the voltage impressed upon the input circuit FGEC. This implies that the power amplification is independent of the input. This is the condition for an ideal amplifier. Second....
Page 62 - ... on this circuit; that is. the number of hours until the impressed voltage has fallen to some value such that the current flowing is insufficient. It is customary therefore to express the capacity of dry cells as hours of discharge to certain arbitrary values of the voltage. Table 10 taken from Ordway's 10 paper shows the number of hours of continuous service at various discharge rates to various end points.
Page 63 - Just as the voltage is not a criterion of the service capacity remaining in the cell. so also the short-circuit current is not a true measure of the cell's capacity. Excessively large shortcircuit currents when the cell is new do not indicate that such 11 Trans.