. The Bell System technical journal . Z = 140 \ \Eb=Ec2\=60 Ts;?^ 420 ;t:^r^ ^ ^^ p-:^__. -7 -6 -5 -4 -3 -2 -ICONTROL-GRID POTENTIAL IN VOLTS Fig. 14—Average 6AK5jcharacteristics. are changed. The difficulty immediately arises that, since the tube capaci-tances are usually a large fraction of the total shunt capacitance of eachcoupling network, the variations in capacitance from one tube to anotherbecome very important. It is essential that, after the amplifier is lined upat the factory with standard tubes, any stock tubes taken at random shallgive satisfactory performance in the amplifier. Th
. The Bell System technical journal . Z = 140 \ \Eb=Ec2\=60 Ts;?^ 420 ;t:^r^ ^ ^^ p-:^__. -7 -6 -5 -4 -3 -2 -ICONTROL-GRID POTENTIAL IN VOLTS Fig. 14—Average 6AK5jcharacteristics. are changed. The difficulty immediately arises that, since the tube capaci-tances are usually a large fraction of the total shunt capacitance of eachcoupling network, the variations in capacitance from one tube to anotherbecome very important. It is essential that, after the amplifier is lined upat the factory with standard tubes, any stock tubes taken at random shallgive satisfactory performance in the amplifier. This requires close control 406 BELL SYSTEM TECHNICA L JOURNA L of the capacitances. Not only must the capacitances be held within thelimits of the test specification, but the product averages must be kept closeto the design center values particularly in the cases of the input and outputcapacitances. Table n • Heater Rating Heater voltage volts, a-c or d-c Nominal heater current ampere Maximum Ratings {Design-center values) ^laximum plate voltage 180 volts Maximum screen v
Size: 2950px × 847px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
