TUBE: 6973 FICHIER SOURCE: sheets/049/6/6973.pdf FABRICANT: RCA (Radio Corporation of America, Electron Tube Division, Harrison, N.J.) ANNÉE: DATA finale 10-60 (oct 1960) ; pages 3-5 = version TENTATIVE DATA 8-57 (aout 1957) LANGUE: en ===== PAGE 1 ===== (DATA 1, 10-60) RCA 6973 — Beam Power Tube 9-PIN MINIATURE TYPE. For High-Fidelity Audio-Amplifier Applications. GENERAL DATA Electrical: Heater, for Unipotential Cathode: Voltage (AC or DC) 6.3 ± 10% volts Current at 6.3 volts 0.45 amp Direct Interelectrode Capacitances: Grid No.1 to plate 0.4 max. µµf Grid No.1 to cathode & grid No.3, grid No.2, and heater 9 µµf Plate to cathode & grid No.3, grid No.2, and heater 6 µµf Characteristics, Class A1 Amplifier: Plate Voltage 250 volts Grid-No.2 Voltage 250 volts Grid-No.1 Voltage -15 volts Plate Resistance (Approx.) 73000 ohms Transconductance 4800 µmhos Plate Current 46 ma Grid-No.2 Current 3.5 ma Grid-No.1 Voltage (Approx.) for plate µa=100 -40 volts Mechanical: Operating Position Any Maximum Overall Length 3-1/16" Maximum Seated Length 2-13/16" Length Base Seat to Bulb Top (excl tip) 2-7/16" ± 3/32" Maximum Diameter 0.750" to 0.875" Bulb T6-1/2 Base Small-Button Noval 9-Pin (JEDEC No.E9-1) Basing Designation BOTTOM VIEW 9EU Pin 1 - Grid No.2 Pin 2 - No Connection Pin 3 - Grid No.1 Pin 4 - Heater Pin 5 - Heater Pin 6 - Grid No.1 Pin 7 - Grid No.3, Cathode Pin 8 - Grid No.2 Pin 9 - Plate PUSH-PULL AF POWER AMPLIFIER — Class AB1 Maximum Ratings, Design-Maximum Values: PLATE VOLTAGE 440 max. volts GRID-No.2 (SCREEN-GRID) VOLTAGE 330 max. volts RADIO CORPORATION OF AMERICA DATA 1 10-60 ===== PAGE 2 ===== (DATA 1, 10-60) GRID-No.2 INPUT 2 max. watts PLATE DISSIPATION 12 max. watts PEAK HEATER-CATHODE VOLTAGE: Heater negative w.r.t. cathode 200 max. volts Heater positive w.r.t. cathode 200 max. volts BULB TEMPERATURE (hottest point) 250 max. °C Typical Operation with Fixed Bias: (values for 2 tubes) Plate Voltage 250 350 400 volts Grid-No.2 Voltage 250 280 290 volts Grid-No.1 (Control-Grid) Voltage -15 -22 -25 volts Peak AF Grid-No.1-to-Grid-No.1 Voltage 30 44 50 volts Zero-Signal Plate Current 92 58 50 ma Max-Signal Plate Current 105 106 107 ma Zero-Signal Grid-No.2 Current 7 3.5 2.5 ma Max-Signal Grid-No.2 Current 16 14 13.7 ma Effective Load Resistance (Plate to plate) 8000 7500 8000 ohms Total Harmonic Distortion 2 1.5 2 % Max-Signal Power Output 12.5 20 24 watts Typical Operation with Cathode Bias: (values for 2 tubes) Plate Supply Voltage 300 310 volts Grid-No.2 Supply Voltage 300 310 volts Cathode Resistor 230 270 ohms Peak AF Grid-No.1-to-Grid-No.1 Voltage 48 55 volts Zero-Signal Plate Current 80 77 ma Max-Signal Plate Current 96 92 ma Zero-Signal Grid-No.2 Current 6 5 ma Max-Signal Grid-No.2 Current 14 14 ma Effective Load Resistance (Plate to plate) 5500 6000 ohms Total Harmonic Distortion 2 4 % Max-Signal Power Output 15 17 watts Maximum Circuit Values: Grid-No.1-Circuit Resistance: For fixed-bias operation 0.5 max. megohm For cathode-bias operation 1 max. megohm PUSH-PULL AF POWER AMPLIFIER — Class AB1 (Grid No.2 of each tube connected to tap on plate winding of output transformer) Maximum Ratings, Design-Maximum Values: PLATE AND GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE 410 max. volts RADIO CORPORATION OF AMERICA DATA 1 ===== PAGE 3 ===== (TENTATIVE DATA 1, 8-57 — version antérieure) RCA 6973 — BEAM POWER TUBE. 9-PIN MINIATURE TYPE. GENERAL DATA Heater: Voltage 6.3 ac or dc volts ; Current 0.45 amp Direct Interelectrode Capacitances: Grid No.1 to plate 0.7 max. µµf [NB: 0.7 ici vs 0.4 sur version 10-60] Grid No.1 to cathode & g3, g2, heater 8 µµf [vs 9] Plate to cathode & g3, g2, heater 8.5 µµf [vs 6] Characteristics, Class A1 Amplifier: (identiques 10-60) Plate Voltage 250 ; Grid-No.2 250 ; Grid-No.1 -15 ; Plate Resistance 73000 ohms ; Transconductance 4800 µmhos ; Plate Current 46 ma ; Grid-No.2 Current 3.5 ma ; Grid-No.1 V for plate 100µa = -40 volts Mechanical: Max Overall Length 2-5/8" ; Max Seated Length 2-3/8" ; Max Diameter 7/8" ; Bulb T6-1/2 ; Base Small-Button Noval 9-Pin (E9-1) ; Basing 9EU [Brochage identique: Pin1=g2, Pin2=NC, Pin3=g1, Pin4=h, Pin5=h, Pin6=g1, Pin7=g3+cathode, Pin8=g2, Pin9=plate] PUSH-PULL AF POWER AMPLIFIER — Class AB1 Maximum Ratings, Design-Center Values: PLATE VOLTAGE 400 max. volts GRID-No.2 VOLTAGE 300 max. volts GRID-No.2 INPUT 2 max. watts PLATE DISSIPATION 12 max. watts 8-57 TENTATIVE DATA 1 ===== PAGE 4 ===== (TENTATIVE DATA 1, 8-57) PEAK HEATER-CATHODE VOLTAGE: 200 max / 200 max volts (neg & pos) BULB TEMPERATURE 250 max °C Typical Operation with Fixed Bias (2 tubes): Plate Voltage 250/350/400 ; Grid-No.2 250/280/290 ; Grid-No.1 -15/-22/-25 ; Peak AF g1-g1 30/44/50 ; Zero-Sig Plate I 92/58/50 ; Max-Sig Plate I 105/106/107 ; Zero-Sig g2 I 7/3.5/2.5 ; Max-Sig g2 I 16/14/13.7 ; Load(p-p) 8000/7500/8000 ; THD 2/1.5/2 % ; Max-Sig Power Out 12.5/20/24 watts Typical Operation with Cathode Bias (2 tubes): Plate Supply 300/310 ; g2 Supply 300/310 ; Cathode Resistor 230/270 ohms ; Peak AF g1-g1 48/55 ; Zero-Sig Plate I 80/77 ; Max-Sig Plate I 96/92 ; Zero-Sig g2 I 6/5 ; Max-Sig g2 I 14/14 ; Load(p-p) 5500/6000 ; THD 2/4 % ; Power Out 15/17 watts Maximum Circuit Values: g1 R fixed 0.5 megohm / cathode 1 megohm PUSH-PULL AF POWER AMPLIFIER Class AB1 (g2 connected to tap on plate winding): Max Ratings Design-Center: PLATE AND GRID-No.2 SUPPLY VOLTAGE 375 max. volts [vs 410 sur 10-60] 8-57 TENTATIVE DATA 1 ===== PAGE 5 ===== (TENTATIVE DATA 2, 8-57) GRID-No.2 INPUT 1.75 max. watts [vs 2 sur 10-60] PLATE DISSIPATION 12 max. watts PEAK HEATER-CATHODE VOLTAGE 200/200 max volts BULB TEMPERATURE 250 max °C Typical Operation (2 tubes), g2 to tap config: Fixed Bias / Cathode Bias Plate-Supply Voltage 375 / 370 volts Grid-No.2 Supply Voltage * / # (from taps) Grid-No.1 Voltage -33.5 / - volts Cathode Resistor - / 355 ohms Peak AF g1-g1 67 / 62 volts Zero-Signal Cathode Current 62 / 74 ma Max-Signal Cathode Current 95 / 84 ma Effective Load (p-p) 12500 / 13000 ohms THD 1.5 / 1.2 % Max-Signal Power Output 18.5 / 15 watts Maximum Circuit Values: g1 R fixed 0.5 / cathode 1 megohm Notes: ° without external shield ; ▲ dc component must not exceed 100 volts ; taps apply 50% (fixed) / 43% (cathode) of plate signal voltage to grid No.2. 8-57 TENTATIVE DATA 2 ===== PAGE 6 ===== [courbes seules — pas de données tabulaires] AVERAGE PLATE CHARACTERISTICS, Ef=6.3V, Grid No.1 Volts=0, curves Ec2=100..300 ===== PAGE 7 ===== [courbes seules — pas de données tabulaires] AVERAGE CHARACTERISTICS, Ef=6.3V, Grid No.2 Volts=250, Ib & Ic2 vs plate volts, Ec1=0..-20 ===== PAGE 8 ===== [courbes seules — pas de données tabulaires] OPERATION CHARACTERISTICS Push-Pull Class AB1, Ef=6.3 Va=350 Vg2=280 Vg1=-22, Power Output & Distortion vs load resistance