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Paul Voigt patented a negative feedback amplifier in January 1924, though his theory lacked detail. [4] Harold Stephen Black independently invented the negative-feedback amplifier while he was a passenger on the Lackawanna Ferry (from Hoboken Terminal to Manhattan) on his way to work at Bell Laboratories (located in Manhattan instead of New Jersey in 1927) on August 2, 1927 [5] (US Patent ...
Early Bs have an attached power cord, like the A version. Some differences: Version A has no stereo effects loop or footswitch for reverb, and the lead channel is much like the Mark IIC+s. Version B has switchable reverb, a single switchable stereo effects loop, and an output to drive another power amp. Its voicings are altered slightly.
A few Dumble amps have a Dumbleator circuit built in, but most have "un-buffered" input jacks that tap directly out of the pre-amp and into the power amp. Dumble likely created this external loop because of the difficulty of fitting effects loop buffering into the amplifier chassis (and the limited use of effects loops for most players). The ...
An effects loop is a series of audio effects units, connected between two points of a signal path (the route that a signal would travel from the input to the output); usually between the pre-amp and power amp stages of an amplifier circuit, although occasionally between two pre-amp stages. The two principal uses of effects loops are in ...
The power amplifier uses four 6L6GC tubes in the power section in class AB. It has 120 watts RMS output power, into 16, 8 or 4 Ohms. The effects loop can be bypassed with a footswitch. It features separate inputs for both high and low gain. The amplifier has two channels, rhythm and lead.
The amplifier was reissued for the first time in 1988 (the 1959S), and again from 1991 to 1993 (the 1959X) and from 1993 to 1995 (the 1959SLP). [1] The SLP continued after 1995 but in 2000 Marshall added modifications to lower the noise floor (hum balance pot), reverted the negative feedback resistor to the 1968-69 value of 47 kΩ, and added an effects loop.