page_title: List of vacuum tubes
section_title: 800s
hierarchical_section_title: List of vacuum tubes / List of other number tubes / 8 / 800s
caption_attribution_description: English: Westinghouse 866A mercury vapor half-wave rectifier tube.
context_page_description: This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. Many industrial, military or otherwise professional tubes were also produced. Only a few types are still used today, mainly in high-power, high-frequency applications.
context_section_description: 800 – Directly heated V.H.F. power triode, giving 35 watts up to 60 MHz and 18 watts at 180 MHz. American 4-Pin(UX)base with side locating pin.
  801 – Directly heated power triode, used in pairs in Class-B in A.M. modulation sections of transmitters giving up to 45 watts of power at 60 MHz and 22 watts at 120 MHz.
  802 – Indirectly heated H.F. power pentode, giving 8 watts up to 30 MHz and 4 watts at 110 MHz.
  803 – Directly heated H.F. power pentode, giving 50 watts up to 20 MHz and 25 watts at 70 MHz.
  804 – Directly heated H.F. power pentode, giving 20 watts up to 15 MHz and 10 watts at 10 MHz.
  805 – Directly heated H.F. high-mu triode, giving 140 watts up to 30 MHz and 70 watts at 85 MHz.
  806 – Directly heated H.F. high-mu triode, giving 390 watts up to 30 MHz 195 watts at 100 MHz.
  807 – Indirectly heated H.F. beam power tetrode, giving 25 watts up to 30 MHz and 12 watts at 125 MHz. A variation of type 6L6 originally designed as a Class-C transmitter tube. Later used in pairs as push-pull outputs for high-wattage Class-AB₂ audio amplifiers. Also used as a horizontal output tube in early TV receivers. One of the first commercial tubes that used the top cap to connect the anode (instead of the control grid) to the circuit. 
  808 – Directly heated H.F. high-mu triode, giving 140 watts up to 30 MHz and 70 watts at 130 MHz.
  809 – Directly heated H.F. high-mu triode, giving 55 watts up to 27 MHz and 30 watts at 100 MHz.
  810 – Directly heated H.F. triode, 10 volt filament and Zirconium Carbide anode. Base fits R.C.A. UT-541A Socket.
  811A – Directly heated H.F. triode, 6.3 volt filament, 88 watts
  813 – Beam Power Tetrode possessing about 5 times the Anode dissipation of an 807.
  814 – A directly heated Beam Power Tetrode giving about 130 watts at 30 MHz and 65 watts at 100 MHz operating in Class-C.
  815 – An indirectly heated dual Pentode. International Octal, (IO), base.
  825 – First commercially available klystrode, a VHF/UHF linear-beam transmitting tube, similar to a klystron
  829 – A dual indirectly heated beam power tetrode. Two 6.3 volt heaters sharing a common tap.
  830 – A directly heated triode giving about 50 watts at 15 MHz and 7.5 watts at 60 MHz operating in Class-C.
  831 – A directly heated triode giving about 400 watts at 20 MHz and 200 watts at 60 MHz operating in Class-C. 11 volt heater/filament.
  833 – A larger directly heated high-mu triode giving about 1 kW at 30 MHz and 500 watts at 45 MHz operating in Class-C. Usable up to 100 MHz at reduced power, (400 W). 10 volt heater/filament drawing 10 A. The anode of this device is fabricated from tantalum. Anode current of 800 mA with an anode voltage of 3 kV and grid voltage of zero. Anode current of 4.3 A at a voltage of 750 with 350 volt on the grid. Uses two-part R.C.A socket assembly UT-103.
  833A – Improved 833. 
  834 – A directly heated triode giving 58 watts at 100 MHz and 25 watts at 350 MHz operating in Class-C. 7.5 volt heater/filament. Fitted with an American 4-Pin, (UX4), base with side locating pin.
  836 – An indirectly heated high vacuum rectifier with a peak inverse voltage of 5 kV and peak anode current of 1 ampere. 2.5 volt heater.
  837 – An indirectly heated pentode giving 11 watts at 20 MHz and 5 watts at 80 MHz. operating in Class-C. 12.6 volt heater.
  838 – A directly heated triode giving about 100 watts at 30 MHz operating in Class-C. 10 volt heater/filament.
  841 – A directly heated high-mu triode giving about 10 watts at 6 MHz and 5 watts at 170 MHz operating in Class-C. 7.5 volt heater/filament.
  842 – A directly heated triode giving about 3 watts at 6 MHz operating in Class-C. 7.5 volt heater/filament.
  843 – An indirectly heated tetrode giving gain at 6 MHz and usable up to 200 MHz operating in Class-C. 2.5 volt heater/filament.
  844 – A directly heated triode giving gain at 6 MHz and usable up to 155 MHz operating in Class-C. 2.5 volt heater/filament.
  845 – A directly heated triode giving up to 24 watts if undistorted power in Class-A at audio frequency with an anode voltage of 1250. 11 volt heater/filament. 
  849 – A directly heated triode giving gain a
caption: 866A
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