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A series circuit with a voltage source (such as a battery, or in this case a cell) and three resistance units. Two-terminal components and electrical networks can be connected in series or parallel. The resulting electrical network will have two terminals, and itself can participate in a series or parallel topology.
In a simul-class amp, running all four tubes generates approximately 75 watts RMS of power; running only the class A tubes produces about 15 watts. Also available were non-simul-class Mark IIBs in both a 60 watt version and a 100 watt version that allowed shifting down to 60 watts by turning off a pair of power tubes.
The 15 A 7-15 plug has the crowsfoot current carrying pins of the Type I plug, but with a U-shaped earth pin. The 7-20 version has an enlarged line/hot pin. 7-30 is a larger diameter connector, with an L-shaped neutral, while the 7-50 has an enlarged neutral pin, compared with the hot.
The rarest of all the original 'woodie' series was the Professional. It was the largest of the trio featuring Jensen 15” field-coil speaker and 6 tubes delivering 25 watts of power. [3] The production of these amps ceased in 1948, however, the names of the amps became enduring ones for Fender.
Further development led to the JCM800 series in 1981, which was widely adopted by the hard rock and metal community, while the brand celebrated its 25 years of making amps by releasing the Silver Jubiliee in 1987. Marshall updated the JCM lineup in the 1990s (JCM900) and 2000s (JCM2000) and developed new amp lines, like the DSL and JVM models.
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The volt-ampere (SI symbol: VA, [1] sometimes V⋅A or V A) is the unit of measurement for apparent power in an electrical circuit.It is the product of the root mean square voltage (in volts) and the root mean square current (in amperes). [2]
In much of the world, a voltage (nominally) of 230 volts and frequency of 50 Hz is used. ... 15% Space heating 750 (207) ... By connecting two groups of 110 V lamps ...