![]() Unlike the 6L6, (EIA base 7AC) the E元4 has its grid 3 connection brought out to a separate Pin (Pin 1) (EIA base 8ET) and its heater draws 1.5 Amps compared to the 0.9 Amp heater in the 6L6. Although power pentodes and beam tetrodes have some differences in their principles of operation (the beam forming plates of the beam tetrode or fifth electrode (3rd grid) of the pentode, both serving to hinder the return of unabsorbed electrons from the anode (or plate) to the 4th electrode (2nd grid)) and have some internal construction differences, they are functionally closely equivalent. The E元4 is a pentode, while the 6L6, which delivers a similar range of power output, is a beam tetrode which RCA referred to as a beam power tube. This configuration is typically found in guitar amplifiers.Īn E34L made by JJ Electronics c.2011, using blue glass More commonly found is a pair of E元4s running class AB1 in push–pull around 375–450 V plate voltage and producing 50 watts output (if fixed bias is used), while a quad of E元4s running class AB1 in push–pull typically run anywhere from 425 to 500 V plate voltage and produces 100 watts output. One application of this type was in "Australian Sound" public address amplifiers commonly used in government schools in Australia in the 1950s, using four E元4s for ≈200 watts. However, this configuration is rarely found. According to the data sheets found in old vacuum tube reference manuals, a pair of E元4s with 800 V plate voltage can produce 90 watts output in class AB1 in push–pull configuration. In common with all 'E' prefix tubes, using the Mullard–Philips tube designation, the E元4 has a heater voltage of 6.3 V. The USSR analog was 6P27S (Cyrillic: 6П27C). The American RETMA tube designation number for this tube is 6CA7. The E元4 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 heater and cathode and other parameters. ![]() ![]() The E元4 was introduced in 1955 by Mullard, who were owned by Philips. ![]() The E元4 is a thermionic vacuum tube of the power pentode type. Tung-Sol 6CA7 (E元4 Substitute) Vacuum Tube Logic Book 2nd Edition, 1994, page 151 Class-A amplifier, class-AB amplifier, class-B amplifier, (audio amplifiers) ![]()
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