955 acorn triode
955 acorn triode | |
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Classification | V.H.F. Triode |
Service | class-A amplifier operation |
Amplification factor | 20-25 |
Anode voltage | 180 V |
Anode current | 4.2 mA |
Bias voltage | -5 V |
Anode resistance | 12.5 kΩ |
References | |
RCA Datasheets of 954, 955, 956, 957, 958A, 959 Philips Valve Data Book, Australia, 1954 |
The type 955 triode "
The 955 is one of about a dozen types of "acorn valve", so called because their size and shape is similar to the
Pin connections
When viewing the device from above (the end without the exhaust tip), the pins are arranged in a group of three and a group of two, starting with the centre pin in the group of three and going in a clockwise direction, the pins are cathode, heater, grid, anode, heater.
Ratings
The 955 is an indirectly heated triode with heater electrically isolated from the cathode. The heater has a 6.3 volt rating, which it shares with many other common thermionic valves/electron tubes, and it draws about 150 mA.
The maximum anode voltage is 250 V, with an anode current of 420 microamperes and anode load 250 kilohm, and the maximum anode current is 4.5 mA at a voltage of 180 V with an anode load of 20 kilohm.[4] The 955 is designed to be used in the frequency range of 60–600 MHz (5-0.5 metres wavelength). The amplification factor obtained is between 20 and 25 depending on details of the specific stage design and operating voltage.
See also
References
- ^ Popular Science, January 1935, New Dwarf Tube Ready for Amateur, p. 58, at Google Books
- ^ a b Ludwell A. Sibley. "The Acorn Tube" (PDF). Retrieved 2 April 2018.
- ^ "957 • 958 • 959 (Acorn Types)" (PDF). R.C.A. Manufacturing Company, Harrison, New Jersey, USA. Retrieved 15 August 2015.
- ^ Philips Valve Data Book, Philips Electrical Industries Pty. Ltd., 69-73 Clarence Street Sydney, Radio Valve Application Division, 1954.