. Electronic apparatus for biological research . Output Static balance adjustment HT + Figure Figure Lack of static balance occurs as a result of asymmetries in the circuits of three kinds: (1) lack of balance in the resistance of valve pairs in each stage when the grid potentials are equal; (2) lack of balance in the circuit resistors deUberately introduced to achieve gain balance; (3) numerous other effects, many of which fluctuate, to produce 'drift'. It is possible but unwise to use direct-coupled amplifiers in a state of static unbalance. Quite a small amount of unbalance
. Electronic apparatus for biological research . Output Static balance adjustment HT + Figure Figure Lack of static balance occurs as a result of asymmetries in the circuits of three kinds: (1) lack of balance in the resistance of valve pairs in each stage when the grid potentials are equal; (2) lack of balance in the circuit resistors deUberately introduced to achieve gain balance; (3) numerous other effects, many of which fluctuate, to produce 'drift'. It is possible but unwise to use direct-coupled amplifiers in a state of static unbalance. Quite a small amount of unbalance originating in an early stage is ampUfied by the later stages and the final stage may be operating under conditions of serious distortion—one valve passing grid current and the other cut off. Since the final stage is affected first, static-unbalance is best detected by a sensitive and high resistance voltmeter connected between the final stage anodes. If the final stage is operating in a statically balanced condition there is seldom cause to worry about the earlier ones. 190
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