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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 ...
2A3 – Directly heated power triode, used for AF output stages in 1930s–1940s audio amplifiers and radios. 2A5 – Power Pentode (Except for heater, electronically identical to types 42 and 6F6) 2A6 – Dual diode, high-mu triode (Except for heater, electronically identical to type 75)
The plate or anode of a power pentode is designed to be capable of dissipating more power than that of an ordinary pentode. [14] 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
ECLL800 – Triode and dual screened power pentode, for 9.2 W or 8.5 W AF push-pull power amplifiers. The triode shares its control grid with the 1st pentode and acts as a phase inverter for the 2nd pentode; both pentodes share screen and suppressor grids; noval base
The TNT Series bass amplifier first entered the market in the late 1970s as a 45-watt combo with one 15-inch speaker. The high-power TNT bass amplifier series was introduced as a 150–200 watt bass combo primarily equipped with a Scorpion or Black Widow 15-inch woofer.
The transmitting tubes TT21 and TT22 have almost identical transfer characteristics to KT88 but a different pinout, and by virtue of their anode being connected to the top cap have a higher plate voltage rating (1.25 kilovolt) and a higher power output capability of 200 watts in class AB1 push–pull.
The 6V6 is a beam-power tetrode vacuum tube. The first of this family of tubes to be introduced was the 6V6G by Ken-Rad Tube & Lamp Corporation in late 1936, [1] with the availability by December of both Ken-Rad and Raytheon 6V6G tubes announced. [2] It is still in use in audio applications, especially electric guitar amplifiers. [3]
The amplifier featured five valves and an output of 10 watts - hence '5-10'. Of those valves, one was a full-wave rectifier (an EZ80 or EZ81), one was a pre-amplifier pentode EF86 and one a double-triode ECC83 as phase splitter. The power amplification was handled by a pair of EL84 working in push-pull configuration.