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The magic eye (also called a cat's eye, or tuning eye in North America) is a specific type of such a tube with a circular display similar to the EM34 illustrated. Its first broad application was as a tuning indicator in radio receivers , to give an indication of the relative strength of the received radio signal, to show when a radio station ...
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The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, which was 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 ...
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
This is a list of European Mullard–Philips vacuum tubes and their American equivalents. Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme.
F tuning – F-A ♯-D ♯-G ♯-C-F / F-B ♭-E ♭-A ♭-C-F Five and a half steps down from standard tuning. Used by the deathgrind band Maruta, the instrumental doom metal band Bongripper, and the progressive metal band Meshuggah (however the band uses 8-string guitars). Octave tuning – E-A-D-G-B-E Six full steps (one octave) down from ...
The 807 design (with some "value engineering" to reduce production cost) was the basis for the first application-specific horizontal sweep tubes such as the 6BG6G and 6CD6G. The redesign mainly involved the omission of some of the internal RF shielding, and the substitution of a bakelite octal base for the micanol or ceramic 5-pin.
It was the usual practice for power transformers to have a 5 volt insulated winding for rectifier filaments, and a 6.3 volt winding for all the other heaters; virtually all valves with 5V filament are rectifiers with cathode connected to heater, in practice full-wave (usable as half-wave by strapping both anodes together), e.g. GZ34.