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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).
Op amps with a built-in capacitor are termed compensated, and allow circuits above some specified closed-loop gain to be stable with no external capacitor. In particular, op amps that are stable even with a closed loop gain of 1 are called unity gain compensated.
The Williamson amplifier is a four-stage, push-pull, class A triode valve amplifier built around a high quality, wideband output transformer. [59] Its second (concertina-type phase splitter, V1B), third (driver, V2A and V2B) and fourth (output, V3 and V4) stages follow Cocking's Quality Amplifier circuit.
It is also the first Mesa amp to feature MIDI connections, which can control the channel switching, as well as controlling the FX loop and graphic EQs. Much like the Mark 5:25, the JP-2C features a built-in CabClone. The amp also features a switch to drop the amp's wattage down to 60 watts for use in smaller venues or recording.
An instrumentation amplifier can also be built with two op-amps to save on cost, but the gain must be higher than two (+6 dB). [ 4 ] [ 5 ] Instrumentation amplifiers can be built with individual op-amps and precision resistors, but are also available in integrated circuit from several manufacturers (including Texas Instruments , Analog Devices ...
Four of these amplifiers were built and delivered to Townshend, and the Marshall Super Lead Model 1959, the original Plexi, was born in 1965. At the request of Townshend, Marshall produced an 8×12-inch cabinet (soon replaced by a pair of 4×12-inch cabinets) on top of which the 1959 amplifier head was placed, giving rise to the Marshall stack ...
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