BY-PASSING THE GRID-BIAS RESISTANCE
In many instances where a resistor is employed for the purpose of obtaining ”C” bias or “C” voltage from the “B” power unit, no by-passing condenser is employed. This is an important oversight, since audiofrequency currents must pass through tills part of the valve circuit, with the resistor offering serious opposition to their flow because of its straight resistance, and. in the case of wirewound resistors, the inductance or choke-coil effect as well. In fact, there is an appreciable loss of volume and tone quality in the absence of a bypass. There will be an improvement in volume and tone when a by-pass condenser is shunted across any gridbias resistor. This condenser should have a capacity of 1 - or 2-mf., and may be of the low-voltage type. One with a rated operating value of ISO volts is satisfactory.
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https://paperspast.natlib.govt.nz/newspapers/SUNAK19281205.2.197
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Sun (Auckland), Volume II, Issue 529, 5 December 1928, Page 16
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142BY-PASSING THE GRID-BIAS RESISTANCE Sun (Auckland), Volume II, Issue 529, 5 December 1928, Page 16
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