3B-850A ETC | Alldatasheet

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Technical content

. (4242A) ) Triode 2RQA CATHODE. Thoriated tungsten filament. Voltage 10 v Nominal current 3.25 A Peak emission 2 A RATING. Amplification factor || Measured at Va— 12.0 Impedance IkV, Vg,—55 Vf 3,000 ohms DIRECT INTER-ELECTRODE CAPACITIES. Grid to anode 13 pF Grid to filament 6.5 pF Anode to filament 4 pF DIMENSIONS. Overall length 204 mm. Maximum diameter 59 mm, Base Large 4-pin bayonet Net weight 160 & MAXIMUM RATINGS. Maximum direct anode voltage 1,250 v Maximum direct anode current 150 mA Maximum anode dissipation 85 w Maximum direct grid current 50 mA Maximum frequency for above rating 6 Mc/s Maximum anode voltage for frequency of

30 Mc/s 600 Vv

NOTE.—This valve should be mounted so that the plane of the filament is vertical. August 1945 3B/850A—1

(4242A) . Triode 424A TYPICAL OPERATING CONDITIONS. AUDIO FREQUENCY. Class B. Amplifier or Modulator. For balanced Pevalve circuits. Direct anode voltage 1,250 1,000 V Anode current per valve zero signal 25 25 mA Anode current per valve maximum signal 150 150 mA Grid bias 95 —I5V Anode dissipation 64 56W Load resistance 9,600 8,000 ohms Peak signal grid to grid 165 140 V *Approximate grid driving power 4 2W Maximum output 2 valves 245 185 W RADIO FREQUENCY. Class B. Telephony. Modulated Carrier applied to Grid. (Carrier conditions per valve for use with 100% modulation). Direct anode voltage 1,250 1,000 V Grid bias —100 —80 V Direct anode current 100 125 mA *Direct grid current 2 15 mA Peak R.F. grid voltage 2 105 Power output 4l 40W Class C. Amplifier. Anode subjected to modulation. (Carrier conditions per valve for use with 100% modulation.) Direct anode voltage 1,000 Vmax. 750 V Grid bias —195 180 V Direct anode current 150 150 mA Peak R.F. grid voltage 295 285 V *Direct grid current 7 17 mA Power output 110 80 W Class C. Amplifier or Oscillator, Unmodulated. Direct anode voltage 1,250 1,000 V Grid bias —153 —133V Direct anode current 150 150 mA Peak R.F. grid voltage 243 223 V *D.C. grid current WS. 10 mA Power output. 140 108 W * Subject to wide variation dependent upon the impedance of the load circuit. August 1945 3B/8S0A—2

. (4242A) ) Triode 242A eb aes ee MS Ue oe es EE gee bee: iat atte ca ee | Biinrenesetes| 800] ait Pacpe attic ° ase dtzetet rere RES asset SESE ceasteseeeSeteceg cee to ANODE VOLTS ee age te Aone Red eificn jatigmtetis Tanna Sey EEE ase cease toe atte eee eae is eg tn aera Ra ray stairs pean nite ee ee re ae a rae ces a te ae Popp it eect ites ATT ° 500 1000 1500, ANODE VOLTAGE (V) August 1945 3B/8S0A—3

(4242A) . (ana) Triode ) 4242A — | | | 204mnMAX | | | | | | | | i PLANE OF en 2 FILAMENT. >>, A ai) FF F eis) * August 1945 3B /850A—4