TWO-VOLT VALVES
When using two-volt valves through- | out in a multi-stage receiver (with four or more valves) it is often advisable to omit all filament rheostats unless the design which is being followed specially calls for them-pos-sibly as a volume control by dimming the H.F. amplifier. The reason for this is that a certain voltage is dropped in battery leads, both external and internal, and with the small surplus at cur disposal it is quite possible that the residual resistance in a rheostat at minimum setting, in conjunction with the extra lengths of wire used in connect- ’ ing it, may be sufficient to prevent the application of the full rated filament voltage. This advice applies with greatest force when one or more of the valves consume a comparatively high current. It will be realised that, to obtain a wattage approximating to that consumed by six-volt valves, the tendency is to increase the heating current of those with two-volt filaments.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280330.2.31.3
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Radio Record, Volume I, Issue 37, 30 March 1928, Page 12
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159TWO-VOLT VALVES Radio Record, Volume I, Issue 37, 30 March 1928, Page 12
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