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The 1959 Miniwatt Technical Data book from Philips lists the 6BQ5 as the R.E.T.M.A. (American) name for the EL84 in its "Type Number Cross Reference", [1] and hence an exact substitute. American and Japanese manufacturers might label their versions of the EL84 as EL84/6BQ5 or 6BQ5/EL84 [2] or simply "6BQ5". Other manufacturers followed with ...
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 ...
Continuously transmitting tubes: Maximum anode dissipation in W or kW in Class-C amplifier telegraphy; Pulsed transmitting tubes: Maximum peak anode current in A (number preceded by "P") Rectifiers: Maximum average anode current in mA; Thyratrons: Maximum average anode current: Less than 3 digits: in mA; 3 or more digits: 1st digit: =0 – in mA
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 6AQ5 [1] (Mullard–Philips tube designation EL90) is a miniature 7-pin (B7G) audio power output pentode vacuum tube with ratings virtually identical to the 6V6 at 250 V. [2] It was commonly used as an output audio amplifier in tube TVs and radios. It was also used in transmitter circuits. [3]
Wherever possible, the 12V equivalent of a 6V tube had the same letters, just 12 instead of 6. L as a first letter often indicates a lock-in (Loktal) tube. P as a second letter from the end indicates a CRT. S as a first letter indicates single-ended tubes, related to grid-cap tubes. S as a second letter indicates single-ended tubes.
In Europe, the principal method of numbering vacuum tubes ("thermionic valves") was the nomenclature used by the Philips company and its subsidiaries Mullard in the UK, Valvo (de, it) in Germany, Radiotechnique (Miniwatt-Dario brand) in France, and Amperex in the United States, from 1934 on.
However, many specialised Russian tubes, such as special military or transmitter tubes, do not follow the above convention. Some of the better-known Russian equivalents of West European and American tubes are the 6P14P (Russian: 6П14П ), an EL84 ; 6N8S (Russian: 6Н8С ), a 6SN7 ; and 6P3S-E (Russian: 6П3С-Е ), a version of the 6L6 .