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heaters. The 957 is a medium-ÎĽ signal triode, the 958 is a transmitting triode with dual, paralleled filaments for increased emission, and the 959 is a sharp cut-off pentode like the 954. The 957 and 959 draw 50 mA heater current, the 958 twice as much. In 1942, the 958A with tightened emission
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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. The 955 is designed to be used in the frequency range of 60–600 MHz
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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
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are minimized by the small dimensions of the device and the widely separated pins. The connecting pins are placed around the periphery of the bulb and project radially outward: this maintains short internal leads with low
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range. The 954 and 956 types are sharp and remote cut-off pentodes, respectively, both also with indirect 6.3 V, 150 mA heaters. Types 957, 958 and 959 are for portable equipment and have 1.25 V
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specs was introduced after it turned out that 958s with excessively high emission kept working after the filament power was turned off, the filament still sufficiently heating on the anode current alone.
236:, an important property allowing operation at high frequency. The pins fit a special socket fabricated as a ceramic ring in which the valve itself occupies the central space. The 955 was developed by
223:
in USA) designed primarily to operate at high frequency. Although data books specify an upper limit of 400–600 MHz, some circuits may obtain gain up to about 900 MHz. Interelectrode
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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.
294:(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.
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The 955 is one of about a dozen types of "acorn valve", so called because their size and shape is similar to the
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247:(nut of the oak tree), introduced starting in 1935 and designed to work in the
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Philips Valve Data Book, Philips
Electrical Industries Pty. Ltd., 69-73
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372:"957 • 958 • 959 (Acorn Types)"
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403:, Radio Valve Application Division, 1954.
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240:and was commercially available in 1935.
198:Philips Valve Data Book, Australia, 1954
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18:
7:
276:cathode, heater, grid, anode, heater
16:Thermionic valve for VHF operation
14:
327:New Dwarf Tube Ready for Amateur
41:TO-72 Transistor for comparison
1:
36:R.C.A. 955 U.H.F. Triode tube
379:R.C.A. Manufacturing Company
419:Products introduced in 1935
381:, Harrison, New Jersey, USA
445:
172:
26:
288:indirectly heated triode
401:Clarence Street Sydney
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269:A box of Acorn sockets
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103:Max dissipation Watts
128:Amplification factor
346:Ludwell A. Sibley.
229:Miller capacitances
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173:RCA Datasheets of
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121:class-A amplifier
77:Indirectly heated
59:Class-A amplifier
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348:"The Acorn Tube"
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324:, January 1935,
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217:thermionic valve
160:Anode resistance
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22:955 acorn triode
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322:Popular Science
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261:Pin connections
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286:The 955 is an
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212:" is a small
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90:Heater current
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82:Heater voltage
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47:Classification
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136:Anode voltage
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50:V.H.F. Triode
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424:Vacuum tubes
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383:. Retrieved
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354:. Retrieved
332:Google Books
330:, p. 58, at
325:
321:
317:
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285:
275:
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254:NiCd battery
242:
225:capacitances
205:
203:
152:Bias voltage
74:Cathode type
38:
33:
221:vacuum tube
147:4.2 mA
111:Max voltage
93:150 mA
413:Categories
310:References
234:inductance
210:acorn tube
206:955 triode
168:References
139:180 V
114:250 V
85:6.3 V
63:oscillator
385:15 August
204:The type
155:-5 V
123:operation
304:Micropup
298:See also
119:Typical
106:1 W
356:2 April
282:Ratings
163:12.5 kΩ
69:Cathode
55:Service
429:Acorns
214:triode
34:Right:
375:(PDF)
351:(PDF)
245:acorn
131:20-25
98:Anode
39:Left:
387:2015
358:2018
227:and
191:958A
249:VHF
238:RCA
195:959
187:957
183:956
179:955
175:954
61:or
415::
377:.
338:^
278:.
193:,
189:,
185:,
181:,
177:,
389:.
360:.
219:(
208:"
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
