TUBE: 6BL7 (6BL7-GT)
FICHIER SOURCE: sheets/049/6/6BL7GT.pdf
FABRICANT: RCA (Radio Corporation of America, Harrison NJ — Tube Department)
ANNEE: Oct. 1, 1953 (curves Oct. 26, 1953)
TYPE STRUCTUREL: MEDIUM-MU TWIN TRIODE (deux unités triode indépendantes, chacune 1 grille)

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RCA — 6BL7-GT — MEDIUM-MU TWIN TRIODE
GENERAL DATA
Electrical:
  Heater, for Unipotential Cathodes:
    Voltage   6.3 V (ac or dc)
    Current   1.5 amp
  Direct Interelectrode Capacitances:    [Without ext shield / With ext shield No.308 tied to cathode]
    Unit No.1:
      Grid to Plate    4.2 / 4.2 uuf
      Input            4.4 / 5.0 uuf
      Output           1.1 / 3.4 uuf
    Unit No.2:
      Grid to Plate    4.0 / 4.0 uuf
      Input            4.8 / 5.0 uuf
      Output           1.2 / 3.2 uuf
    Grid of Unit No.1 to Grid of Unit No.2   0.11 / 0.10 uuf
    Plate of Unit No.1 to Plate of Unit No.2  1.5 / 1.2 uuf

Characteristics, Amplifier Class A1 (Each Unit):
  Plate Voltage          250 volts
  Grid Voltage           -9 volts
  Plate Current          40 ma
  Amplification Factor   15
  Plate Resistance       2150 ohms
  Transconductance       6200 umhos    [<- indicates a change]
  Grid-No.1 Bias (approx.) for plate current of 25 uA   -25 volts
  Grid-No.1 Bias (approx.) for plate voltage 600V and plate current 50 uA   -60 volts

Mechanical:
  Mounting Position: Any
  Maximum Overall Length: 3-5/16"
  Maximum Seated Length: 2-3/4"
  Maximum Diameter: 1-9/32"
  Bulb: T-9
  Base: Short Intermediate-Shell Octal 8-Pin (JETEC No. B8-46) ; Basing 8BD
  Pin 1 = Grid of Unit No.2
  Pin 2 = Plate of Unit No.2
  Pin 3 = Cathode of Unit No.2
  Pin 4 = Grid of Unit No.1
  Pin 5 = Plate of Unit No.1
  Pin 6 = Cathode of Unit No.1
  Pin 7 = Heater
  Pin 8 = Heater
OCT. 1, 1953

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VERTICAL DEFLECTION AMPLIFIER (Values are for Each Unit)
Maximum Ratings, Design-Center Values (525-line, 30-frame system):
  DC PLATE SUPPLY VOLTAGE         600 max. volts
  DC PLATE VOLTAGE                500 max. volts
  PEAK POSITIVE-PULSE PLATE VOLTAGE   1800 max. volts
  PEAK NEGATIVE-PULSE GRID VOLTAGE    500 max. volts
  DC CATHODE CURRENT              60 max. ma
  PLATE DISSIPATION               10 max. watts
    Total for Both Units          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
Typical Operation in a Vertical Deflection Circuit:
  DC Plate Voltage 450 V ; Cathode-Bias Resistor 1200 ohms ; Grid-Input sawtooth 36V p-p, negative peaking 44V ; DC Plate Current 11 mA ; Plate-Output sawtooth 270V p-p, peak positive pulse 600V
Maximum Circuit Values:
  Grid-Circuit Resistance   4.7 max. megohms
OCT. 1, 1953

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[courbes seules] AVERAGE PLATE CHARACTERISTICS for each unit, Ef=6.3V (Ip vs plate volts, grid 0..-90V). Oct. 26, 1953  92CM-8133