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The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, who were owned by Philips. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between ...
But during the 1970s, Marshall's increasing exports overseas led to a problem: Often the EL34 tubes would break during transportation, to the point where amps began being shipped from the factory with more rugged Tung-Sol 6550 tubes, which are "stiffer and not as harmonically rich" as the EL34 tubes. [3]
Marshall quickly reverted to the older Celestions. [2] Still, some users prefer the pre-JCM800 amplifiers, claiming that those have a warmer, less "brittle" sound. [3] The amplifier was equipped with EL34 valves (tubes) for amps sold in the UK and 6550 tubes for amps exported to the United States. [3]
Marshall's US distributor Unicord also had them change all the amplifiers sold in the US and Japan to the much more rugged General Electric 6550 instead of the EL34 output tube. The combined effect of different valves and a modified circuit gave these mid-1970s Marshalls a very bright and aggressive sound that was punchier than the EL34 sound ...
Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube amplifier (valve amplifier in British English), a vacuum tube-based audio amplifier. [1] At first, the concept of tube sound did not exist, because practically all electronic amplification of audio signals was done with vacuum tubes and other comparable ...
The KT88 was introduced by GEC in 1956 as a larger variant of the KT66. It was manufactured in the U.K. by the MOV ( Marconi-Osram Valve) subsidiary of G.E.C, also labelled as IEC/Mullard, and, in the U.S., Genalex Gold Lion. [ 2] Four KT88s installed and powered. As of 2022, KT88 valves are produced by New Sensor Corporation ( Genalex Gold ...
Dumble Amplifiers. Dumble was a guitar amplifier manufacturer in Los Angeles, California. In the one-person operation, Alexander "Howard" Dumble (June 1, 1944 – January 16, 2022) [ 1][ 2] made each amp personally. Because of this, Dumble amplifiers are the most expensive boutique amplifiers on the used market, [ 3] and prices have risen rapidly.
KT66 is the designator for a beam power tube introduced by Marconi-Osram Valve Co. Ltd. (M-OV) of Britain in 1937 and marketed for application as a power amplifier for audio frequencies and driver for radio frequencies. [ 1][ 2] The KT66 is a beam tetrode that utilizes partially collimated electron beams to form a low potential space charge ...