TUBE: 6FD7
SOURCE FILE: sheets/049/6/6FD7.pdf
MANUFACTURER: RCA (Radio Corporation of America, Electron Tube Division, Harrison NJ)
YEAR: 9-62 (September 1962)
TYPE (per PDF): DUAL TRIODE — "With High-Mu Unit and Low-Mu Unit" (dissimilar double triode)
PAGES: 3 (page1 data, page2 basing + ratings, page3 outline/basing drawing)

===== PAGE 1 =====
RCA — 6FD7 — DUAL TRIODE (High-Mu Unit and Low-Mu Unit)
GENERAL DATA / Electrical:
  Heater Voltage (AC or DC) = 6.3 ± 0.6 V
  Heater Current at 6.3V = 0.925 A
  Peak heater-cathode voltage (each unit): neg 200 max V; pos 200 max V (note a: DC component <=100V)
Direct Interelectrode Capacitances (approx, note b: without external shield):
                       Unit No.1 | Unit No.2
  Grid to plate:        4.5 | 10 µµF
  Grid to cathode+heater: 2.2 | 6.5 µµF
  Plate to cathode+heater: 0.4 | 1.2 µµF
Characteristics, Class A1 Amplifier:
                       Unit No.1 | Unit No.2 (two sub-cols)
  Plate Voltage:        250 | 60 ... 150 V
  Grid Voltage:         -3  | 0 ... -17.5 V
  Amplification Factor: 64  | - ... 6
  Plate Resistance:     40000 | - ... 800 ohms
  Transconductance:     1600 | - ... 7500 µmho
  Plate Current:        1.4 | 95 ... 40 mA
  Grid Voltage for plate µa=10: -5.5 V (Unit1)
  Grid Voltage for plate µa=100: -40 V (Unit2)
  Transconductance for plate mA=1: 500 µmho (Unit2)
  Plate Current for grid volts=-25: 6 mA (Unit2)
Mechanical:
  Operating position: any ; Cathodes: coated unipotential
  Max overall length 2.900"; Max seated length 2.620"; Diameter 1.062-1.188"; Bulb T9; Base JEDEC No. E9-82 (9-pin Neonoval)
FOOTER: RCA, DATA 1, 9-62

===== PAGE 2 =====
6FD7 — Basing Designation for BOTTOM VIEW: 9HF
  Pin 1 = Plate of Unit No.2
  Pin 2 = Grid of Unit No.2
  Pin 3 = Grid of Unit No.2
  Pin 4 = Heater
  Pin 5 = Heater
  Pin 6 = Plate of Unit No.1
  Pin 7 = Grid of Unit No.1
  Pin 8 = Cathode of Unit No.1
  Pin 9 = Cathode of Unit No.2
VERTICAL-DEFLECTION OSCILLATOR (Unit No.1) — Max Ratings (525-line 30-frame):
  DC Plate Voltage = 330 max V
  Peak Negative-Pulse Grid Voltage = 400 max V
  Cathode Current: peak 70 max mA; average 20 max mA
  Plate Dissipation = 1.5 max W
  Grid-Circuit Resistance (grid-resistor or cathode bias) = 2.2 max MΩ
VERTICAL-DEFLECTION AMPLIFIER (Unit No.2) — Max Ratings (525-line 30-frame):
  DC Plate Voltage = 330 max V
  Peak Positive-Pulse Plate Voltage = 1500 max V (note e)
  Peak Negative-Pulse Grid Voltage = 250 max V
  Cathode Current: peak 175 max mA; average 50 max mA
  Plate Dissipation = 10 max W
  Grid-Circuit Resistance = 2.2 max MΩ
  Footnotes: a) DC component <=100V; b) without external shield; c) measured by recurrent-waveform method;
  d) per FCC 525-line/30-frame standards; e) applicable when pulse duration <=15% of vertical scanning cycle (2.5 ms).
FOOTER: RCA, DATA(2)

===== PAGE 3 =====
[Outline & basing drawing — T9 bulb, base JEDEC E9-82, 9 pins (large-button Neonoval 9-pin). Pin circle pins 1-9. No new tabular data.]
FOOTER: RCA, DATA 2, 9-62

NOTE: Declared TRIODE = CONFIRMED, and more precisely a DUAL/DOUBLE TRIODE (two dissimilar triode
sections: Unit1 high-mu µ=64, Unit2 low-mu µ=6). Each unit has plate+grid+cathode only (NO screen
grid) — definitely NOT a tetrode/pentode. Intended for TV vertical-deflection oscillator (U1) + amplifier (U2).
9-pin Neonoval (9HF basing), T9 bulb.