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Most use heaters which can be optionally wired in series (12.6V, 150 mA) or parallel (6.3V, 300 mA). Other tubes, which in some cases can be used interchangeably in an emergency or for different performance characteristics, include the 12AT7 , 12AU7 , 12AV7 , 12AY7, and the low-voltage 12U7, plus many four-digit EIA series dual triodes.
F – 12.6 V DC parallel heater for 6-cell lead-acid vehicle crank batteries; G – Various heaters between 2.5 and 5.0 V AC (except 4 V) from a separate heater winding on a mains or horizontal-output transformer for the anode voltage rectifier; H – 150 mA AC/DC series heater
Electricity is required to heat the ignition source, with systems designed to be compatible with 6-volt, 12-volt, and 24-volt automotive and aircraft electrical systems. Most gasoline heaters produce between 5,000 and 50,000 BTU per hour. A built-in safety switch prevents fuel from flowing unless the fan is working.
The 7.4-volt battery is the most common type of heated clothing battery system, and may be rechargeable. The most popular items sold have traditionally been heated gloves and jackets. 12-volt batteries are designed for use with motorcycles, ATVs, or snowmobiles, and draw their power from the vehicle's battery.
Thermoelectric cooling uses the Peltier effect to create a heat flux at the junction of two different types of materials. A Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side of the device to the other, with consumption of electrical energy, depending on the direction of the current.
The very first set of metal tubes produced included 6-volt heater tubes that could be used to make a transformer-powered 6-tube radio. RCA released their first set of these metal octal tubes for this design in 1939, using 12.6-volt 150 mA heaters instead. The original design used the following tubes: