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This part dates back to the joint valve code key (German: Röhren-Gemeinschafts schlüssel) negotiated between Philips and Telefunken in 1933–34. Like the North American system the first symbol describes the heater voltage, in this case, a Roman letter rather than a number.
The 1956 Hewlett-Packard MODEL 650A Test Oscillator Operator and Service Manual indicated Tung-Sol as a replacement parts designated manufacturer without a part referenced in the specific model. [120] On October 1, 1959, Tung-Sol provided a Price List on Electron Tubes for its commercial and government customers to purchase in bulk pricing.
The typical valve using this topology in (rare) current commercial production is the 300B, which yields about 5 watts in SE mode. Rare amplifiers of this type use valves such as the 211 or 845, capable of about 18 watts. These valves are bright emitter transmitting valves, and have thoriated tungsten filaments which glow like light bulbs when ...
With American 807 or British KT66 valves (Williamson recommended the latter type [61]) and specified power supply the amplifier delivered 15 watts of output power. Further increase in output, according to Williamson, required use of four output valves; his 1947 article mentions construction of a 70-watt prototype.
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
A Yamaha B100-115 combo amp, which contains a 100 watt amplifier and one 15" speaker in a wooden cabinet. A Hartke 500 watt amp "head" on top of an Ashdown 4x10" speaker cabinet. A bass amplifier (also abbreviated to bass amp ) is a musical instrument electronic device that uses electrical power to make lower-pitched instruments such as the ...
Flowserve's heritage dates back to the 1790 founding of Simpson & Thompson by Thomas Simpson, later to become Worthington Simpson Pumps, one of the companies that became part of BW/IP. [8] The company was created in 1997 with the merger of two fluid motion and control companies: BW/IP and Durco International .
In 1967, Marshall released a 50-watt version of the 100-watt Superlead known as the 1987 Model. In 1969, the plexiglass panel was replaced by a brushed metal front panel. Other early customers included Pete Townshend and John Entwistle of The Who, whose search for extra volume led Marshall to design the classic 100-watt valve amplifier. [16]