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The EL84 is smaller and more sensitive than the octal 6V6 that was widely used around the world until the 1960s. An interchangeable North American type is the 6BQ5 (the RETMA tube designation name for the EL84). The EL84 was developed to eliminate the need for a driver tube in radios, so it has rather more gain than is usual in a power pentode.
EL84/6BQ5 (N709) – AF Power pentode EL85/6BN5 – 6 W RF/AF power pentode up to 120 MHz, for use in mobile equipment, EL42 with a Noval base EL86/6CW5 – Audio or CRT vertical deflection output power pentode, identical to LL86/10CW5, PL84/15CW5 [ 11 ] [ 12 ] and XL86/8CW5 except for heater ratings
The pentode EL84/6BQ5 - 9 pin Noval base tube, that although different enough from the 6V6 not to justify rating it as an equivalent, because of its popularity and ready availability, plus having a close-enough similarity to make it possible, if bias is altered, adapters have been developed commercially to allow an amplifier designed for 6V6 ...
6P1P tube manufactured by Svetlana, USSR (winged "C" logo), 1971 A comparison of Svetlana 6P1P (left), 6P1P-EV and Beijing Electron Tube Factory 6P1 (right). The 6P1P (Russian: 6П1П) is a Soviet-made miniature 9-pin beam tetrode vacuum tube with ratings similar to the 6AQ5, EL90 and the 6V6.
This base type was used by many of the United States and most of the European tubes, e.g., 12AX7-ECC83, EF86 and EL84, produced commercially towards the end of the era before transistors largely displaced their use. The IEC 67-I-12a specification calls for a 36-degree angle between the nine pins of 1.016 mm thickness, in an arc of diameter 11. ...
Many output valves such as KT88, EL34, and EL84 were specifically designed to be operated in either triode or tetrode mode, and some amplifiers can be switched between these modes. Post-Williamson, most commercial amplifiers have used tetrodes in the "ultra-linear" configuration.
Mullard opened a new manufacturing plant at the end of New Road, Mitcham, Surrey in 1929.A second building was added in 1936. Both buildings had a very distinctive flat roof construction and were very similar to those at Philips' headquarters in Eindhoven, Netherlands.
The EL34, EL84, 6CL6, 6F6, 6G6, SY4307A and 6K6GT are some examples of pentodes designed for power amplification. Some power pentodes for specific television requirements were: video output pentodes, e.g. 15A6/PL83, PL802
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