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Power attenuator (THD Hot Plate) on Marshall 1959 Super Lead Plexi. A power attenuator, used with a guitar amplifier, is a type of attenuator that diverts and dissipates a portion of the amplifier's power to enable hearing the amplifiers high-volume characteristics at lower volume.
The amps were offered with hardwood cabinets, or in a variety of vinyl-covered birch plywood cabinets in a variety of colors. The amps were built as 1-12", or 1-10" combos, or as a head. JBL E-120 speakers were offered as an option. Jim Kelley Amplifiers were also the first guitar amplifiers to be offered with an optional power attenuator. [5]
THD Electronics, Ltd. is a manufacturer of amplifier accessories, and a former manufacturer of vacuum-tube guitar amplifiers.It is located in Seattle, Washington. It was founded in 1986 by President and CEO Andrew Marshall.
To reduce the volume leakage or to prevent blowing the speaker or microphone, a power attenuator is sometimes used between the tube power amp and the guitar speaker in the isolation box. This reduces the power delivered to the speaker and thus the volume, but has some effect on speaker and microphone response.
The amplifier's master volume control restricts the amount of signal permitted through to the driver stage and the power amplifier. When using a power attenuator with a tube amplifier, the master volume no longer acts as the master volume control. Instead, the power attenuator's attenuation control controls the power delivered to the speaker ...
The TWT is an elongated vacuum tube with an electron gun (a heated cathode that emits electrons) at one end. A voltage applied across the cathode and anode accelerates the electrons towards the far end of the tube, and an external magnetic field around the tube focuses the electrons into a beam. At the other end of the tube the electrons strike ...