R.F. Power Amplifier, Oscillator, A.F. Power Amplifier, or Modulator The Amperex 849-A supersedes ithe 849. It is the older model redesigned along modern engineering principles. In its physical configurations and major electrical characteristics it is identical with the 849. Its performance capabilities are far greater. SEUUTTIQAUARUU AOU EUUUNOOOQUUVECESOOQUUUOOOQUUESUGNO0SUOOOOOOOOUCUUUAQOOOUOOOOGUUUTEOOOOUUEEOOLEE = GENERAL CHARACTERISTICS Filament Voltage ll volts Filament Current 7.7 amperes Average Characteristics: Amplification Factor 19 Grid to Plate Transcon- ductance @ 200 ma. Direct Interelectrode Capacitances: 7600 micromhos 849A 849H Grid to Plate 11.5 11.5 ppt Grid to Filament 14.0 10.0 put Plate to Filament 1.8 18 uei = STANUVNRSUCAQQOUOCGUUOUULOUUOLUEOUENNONQ00000800QU0EUULOUUEOENUOEUONEOUOOOQ0QQ0000G4UEUUUUOUIELi=S MAXIMUM RATINGS AND TYPICAL OPERATING CONDITIONS A.F. Power Amplifier and ModulatorClass A Maximum Rating Typical Operation per Tube One Tube A.C. Filament Voltage . ll i ll D.C. Plate Voltage D.C. Grid Voltage 4000 2500 3000 4000 100 130 185 Peak A.F. Grid Voltage . 94 124 180 D.C. Plate Current (ma.) . 135 120 100 Plate Input (watts) 400 338 360 400 Plate Dissipation (watts) 400 338 360 400 Load Resistance (ohms) 12000 18000 30000 Power Output (watts) _ 82 105 150 Distortion (% Second Harmonic) . 3 2.5 4 A.F. Power Amplifier and ModulatorClass B Maximum Rating Typical Operation per Tube Two Tubes A.C. Filament Voltage . ll ll ll 4000 2500 3000 3000 118 140 140 D.C. Plate Voltage D.C. Grid Voltage Load Resistance (per tube)(ohms) .. 2000 3200 2000 Effective Load Resistance (plate to plate)(ohms) .. 8000 12800 8000 Zero Signal Plate Current (ma.) Le 120 1100 =100 Peak A.F. Grid to Grid Voltage 416 480 600 Max. Signal Plate Current* (ma.) 500 585 530 900 A.F. Power Amplifier and ModulatorClass B (Continued) Maximum Rating Typical Operation per Tube Two Tubes Max. Signal Plate Input (watts) 1350 1460 1590 2700 Plate Dissipation (watts) 500** 620* 490 800* Plate Dissipation (watts) 920** Max. Signal Driving Power*** (Approx.)(watts) . 6 12 40 Minimum Grid Input Resist- ance (Approx.)(ohms) .. 1600 S00 250 Max. Signal Power Output (watts) .. 840 1100 1900 *Average over an audio-frequency cycle of sine-waveform under maximum-signal conditions. ** Average over an audio-frequency cycle of sine-waveform under approximately 70% of maximum drive conditions. ***Based upon peak power demand from driver. ****Low distortion operating condition recommended for plate modulating the final stage of 1 KW Broadcast Trans- mitters. This operating condition makes possible exception- ally low distortion because of the relatively high value of the minimum input resistance to the grids of the tubes, coupled with a low driving power requirement and a practi- cally straight line plate transfer characteristic. R.F. Power AmplifierClass BTelephony Carrier conditions for use with a maximum modulation factor of 1.0 Maximum Rating Typical Operation per Tube One Tube A.C. Filament Voltage .. 11 11 11 D.C. Plate Voltage 3500 2000 2500 3000 D.C. Grid Voltage .. 80 -110 140 Peak R.F. Grid Voltage .. 110 135 )~s160 D.C. Plate Current (ma.) 350 187 216 250 Plate Input (watts) 750 374 $40 750 Plate Dissipation (watts) S00 242 350 480 Plate Load Resistance (ohms) .. 3100 3300 3380 D.C. Grid Current (Approx.)(ma.) .. 3 2 1.8 Driving Power (Approx.) (watts) i 9 12 18 Plate Power Output (watts) .. 132 190 270 Frequency Limit for Above Operation: 849A (mc.) 3.0 15 10 3.0 849H (mc.) 10.0 40 30 20.0 F.C.C. Broadcast Rating (for final stage use)(watts) 250 125 .. 250 *At crest of audio frequency cycle with modulation factor of 1.0.Plate Modulated R.F. Power Amplifier Class CTelephony Carrier conditions for use with modulation factor of 1.0 Typical Operation One Tube 7.5 Maximum Rating per Tube A.C. Filament Voltage _ 11 D.C, Plate Voltage 3000 2500 D.C. Grid Voltage 500 -300 Peak R.F. Grid Voltage = 475 D.C. Plate Current (ma.) 500 335 Plate Input (watts) 1250 838 Plate Load Resistance (ohms) 3700 D.C. Grid Current (Approx.) (ma.) 100 48 Driving Power (Approx.) (watts) _ 22 Plate Dissipation (watts) 400 158 Plate Power Output (watts) _ 680 Frequency Limit for Above Operation (mc.): 849A 3.0 849H 10.0 20 F.C.C. Broadcast Rating (for final stage use) (watts) 750 500 ll 2500 300 520 500 1250 2450 70 35 290 960 750 R.F. Power Amplifier and Oscillator Class CTelegraphy Key-down conditions without modulation Maximum Rating Typical Operation per Tube One Tube A.C. Filament Voltage . ll 1) D.C. Plate Voltage 3500 2500 3000 D.C. Grid Voltage 500 300 300 Peak R.F. Grid Voltage ~ 520 500 D.C. Plate Current (ma.) 500 500 500 Plate Input (watts) 1750 1250 1500 D.C. Grid Current (Approx.) (ma.) 100 70 50 Plate Load Resistance (ohms) _ 2450 2750 Plate Dissipation (watts) 500 290 320 Driving Power (Approx.) (watts) _ 35 25 Plate Power Output (watts) _ 960 1180 Frequency Limit for Above Operation (mc.): 849A 5 10 73 849H 20 40 30 Grid Modulated R.F. Power AmplifierClass C Carrier conditions for use with a maximum modulation factor of 1.0 Maximum Typical Rating Operation per Tube One Tube A.C. Filament Voltage ll D.C. Plate Voltage 3500 3000 D.C, Grid Voltage (Total) 500 425 (Fixed Bias) ~ 415 Grid Resistor (ohms) _ 2200 Peak R.F. Grid ~ 500 Peak A.F. Grid _ 225 D.C. Plate Current (ma.) 350 250 Plate Input (watts) 750 750 Plate Load Resistance (ohms) _ 2750 Plate Dissipation (watts) 900 450 D.C, Grid Current (Approx.) (ma.) _ 4.5 R.F Grid Driving Power (waitts)* _ 25 Plate Power Output (watts) - 300 Frequency Limit for Above Operation (mce.): 849A 3 3 849H 10 20 F.C.C. Broadcast Rating (for final stage use with 33% efficiency) (watts) 250 250 *At positive crest of Audio Frequency cycle of sine-wave form. a SaOUUEDVUSTINNUOEAVIVADANUOLAUIAVAUEOUESTUCAUVEDUTAOUOURDULATARSUOCUOUCONTERUOUEDOUGUAVEDOLUUILY AMPEREX 849-H The Amperex 849-H is identical in all but its interelectrode capaci- tances with the 849-A. The only other point of difference is the grid connection which terminates in an arm extending from the side of the glass envelope. It is de signed for more efficient opera- tion at high frequencies and may be operated at full ratings up to 30 megacycles in many classes of service. IrPLATE AMPERES FILAMENT | 5" (6 GR 849-A ZL 8 ween ds. L H-676 HO4 aldo MOHS S3NI7 031i00 E,=I1 VOLTS AC. GRID AMPERES PLATE VOLTS ~ 2000 PLATE VOLTS849A TRANSFER CHARACTERISTICS AF POWER AMPLIFIER AND MODULATOR CLASSB 1000 WJ W 8 $ a < = 5 < 2 a > = = a x oO a w oO Oo a w r 5 $5 a. a -I6O -I120 -80 -40 O +40 +80 4120 -I6O -20 -80 -40 O +40 +80 +4120 GRID VOLTS GRID VOLTS E.=1) f VOLTS AC PLATE MILLIAMPERES O 2 3 4 5 6 7 PLATE KILOVOLTS