Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

INPUT IMPEDANCE OF PENTODES 315Compensation of Input Capacitance VariationThe variation of input capacitance with transconductance isa disadvantagewhere the capacitance of the input circuit must remainunchanged under conditions of varying transconductance, i.e. varyinggrid bias. This is particularly true at the higher frequencies wherethe tube input capacitance usually forms a larger fraction of the totalinput circuit capacitance.