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12AU7 is also known in Europe under its Mullard–Philips tube designation ECC82. [1] There are many equivalent tubes with different names, some identical, some designed for ruggedness, long life, or other characteristics; examples are the US military 5814A and the European special-quality ECC82 and E182CC.
ECC82/12AU7 (6067, M8136, B329) – Medium-mu dual triode for use as AF amplifier, noval base, identical to XCC82 except for heater ratings. Two EC90/6C4s in one envelope; [ 6 ] however, the ECC82 is only specified as an audio frequency device.
1.25 V or 1.4 V AC from a separate heater winding on CRT horizontal-output transformers, in half-indirectly heated EHT rectifiers; E – 6.3 V parallel heater; for 3-cell lead-acid vehicle crank batteries (mobile equipment) and for AC mains or horizontal-output transformers; F – 12.6 V DC parallel heater for 6-cell lead-acid vehicle crank ...
Unlike the situation with the 6C4 and 12AU7, both the 6AB4 and the 12AT7 are described by manufacturer's data sheets as R.F. (Radio Frequency) devices operating up to VHF frequencies. [ 1 ] The tube has a center-tapped filament so it can be used in either 6.3V 300mA or 12.6V 150mA heater circuits.
n.o.s. = not otherwise specified meaning a collective entry to which substances, mixtures, solutions or articles may be assigned if a) they are not mentioned by name in 3.2 Dangerous Goods List AND b) they exhibit chemical, physical and/or dangerous properties corresponding to the Class, classification code, packing group and the name and description of the n.o.s. entry [4]
For example, a Rinnai America tankless non-condensing natural gas water heater goes for roughly $1,000 at Home Depot, while a comparable condensing tank goes for about $1,800.
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