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2. EL34 - Wikipedia

   en.wikipedia.org/wiki/EL34

   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 ...

3. List of Mullard–Philips vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_Mullard–Philips...

   EL401 – Radiation-cooled power transmitter pentode for 85W SW/VHF service, or for AF amplifiers. EL112 or EL152 with a B8G Loctal base EL112 or EL152 with a B8G Loctal base EL500/6GB5 – CRT horizontal deflection output beam power pentode, magnoval base, identical to LL500/18GB5, PL500/27GB5 and XL500/13GB5 except for heater ratings

4. Electrocompaniet - Wikipedia

   en.wikipedia.org/wiki/Electrocompaniet

   Their first finished product was a 25 Watt power amplifier named "The 2 Channel Audio Power Amplifier", also called "The Otala Amplifier". They continued development on the product. In 1976 a respected high end audio magazine at the time "The Audio Critic" reviewed the amplifier and wrote: "Audio freaks – eat your hearts out.

5. Marine VHF radio - Wikipedia

   en.wikipedia.org/wiki/Marine_VHF_radio

   Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional ... Transmitter power is limited to 25 watts ...

6. Audio power - Wikipedia

   en.wikipedia.org/wiki/Audio_power

   For most audio applications more power is needed at low frequencies. This requires a high-power amplifier for low frequencies (e.g., 200 watts for 20–200 Hz band), lower power amplifier for the midrange (e.g., 50 watts for 200 to 1000 Hz), and even less the high end (e.g. 5 watts for 1000–20000 Hz).

7. 807 (vacuum tube) - Wikipedia

   en.wikipedia.org/wiki/807_(vacuum_tube)

   The screen voltage is the same, at 300, but its dissipation rises to 3.5 watts. 37 watts of R.F. power is produced from 220 mW of drive but only a 50% duty cycle is allowed. The maximum allowable negative control grid, g1 excursion allowable is -200 volts and average control grid current is 5mA in both A.M. and CW modes. [ 1 ]