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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. Eliminating a preamplifier triode in radios made them cheaper. Manufacturers were quick to adopt it in general ...
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 ...
The term pentode means the tube has five electrodes. The pentode was invented in 1926 by Bernard D. H. Tellegen [38] and became generally favored over the simple tetrode. Pentodes are made in two classes: those with the suppressor grid wired internally to the cathode (e.g. EL84/6BQ5) and those with the suppressor grid wired to a separate pin ...
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]
A well-known pentode type, the EF50, was designed before the start of World War II, and was extensively used in radar sets and other military electronic equipment. The pentode contributed to the electronic preponderance of the Allies. The Colossus computer and the Manchester Baby used large numbers of EF36 pentode tubes.
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Its rated power output was increased to 20 watts, its output tubes were a pair of 6BQ5/EL84 (the only Fender amp of that time to feature them) and they were operated at voltages in excess of their rated maximums and under fixed bias, but was soon changed to 35 watts and a pair of 6L6GC power tubes with a GZ34 rectifier (circuits 6G9-A and 6G9-B ...