heater voltage

This would require using a 35L6 to maintain the heater voltage.

Usable life of this expensive component was sometimes extended by fitting a boost transformer to increase heater voltage.

Sometimes emission can be restored for a time by raising heater voltage, either for a short time or a permanent increase of a few percent.

This disproportionate resistance caused them to temporarily operate with heater voltages well above their ratings, and shortened their life.

Tubes on standby for long periods, with heater voltage applied, may develop high cathode interface resistance and display poor emission characteristics.

During the 1950s, most often two devices that shared the same number and all but the first letter of the name would be very similar except for heater voltage/current.

This was fudged by specifying the heater voltage as nominally 7 or 14 volts so that the tube nomenclature fitted.

The instrument was not known for vacuum tube failure perhaps because the heater voltage was reduced from the normal 6.3 volts to 5 volts.

The type designator specifies the heater voltage or current, the functions of all sections of the tube, the socket type, and the particular tube.

The Variac method is not without risk, as the reduced heater voltage applied to the tubes can damage the filament and/or cathode if not operated within the manufacturer's specifications.

The measured parameters include the thermopile signal, the heater voltage and the heater current which is measured as the voltage drop across a 10 Ohms precision resistor.

American nomenclature, also used in Europe, used a number to identify the heater voltage, letters to identify the type, with no systematic coding system and a number specifying the total number of electrodes.

Tube heaters were designed for single, double or triple-cell lead-acid batteries, giving nominal heater voltages of 2 V, 4 V or 6 V. In portable radios, dry batteries were sometimes used with 1.5 or 1 V heaters.

With a relatively simple rewiring, the tube heaters could be put in series-parallel to run off 32 volts, with the three twelve-volt heaters in series and a 25L6, 35L6 or 43 in parallel; the tubes would still function with the heater voltage somewhat out of specification.

In common with all 'E' prefix tubes, using the Mullard-Philips tube designation, it has a heater voltage of 6.3V. It is capable, when used at its plate rating of 300 volts maximum, of producing 17 watts output in Class AB1 in push-pull configuration.

The first number is the (rounded) heater voltage; the letters designate a particular tube but say nothing about its structure; and the final number is the total number of electrodes (without distinguishing between, say, a tube with many electrodes, or two sets of electrodes in a single envelope-a double triode, for example).