TUBE: 6BL7 (6BL7-GTA)
FICHIER SOURCE: sheets/093/6/6BL7GTA.pdf
FABRICANT: General Electric (GE Electronic Tubes / Electronic Components Division, Schenectady NY)
ANNEE: 8-57 (Aug 1957) — ET-T1464
TYPE STRUCTUREL: TWIN TRIODE (deux sections triode indépendantes). 6BL7-GTA interchangeable avec 6BL7-GT, section 1 améliorée.

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GE — 6BL7-GTA — TWIN TRIODE
For TV vertical-deflection oscillator and amplifier applications.
The 6BL7-GTA is a twin triode especially designed for use as a combined vertical deflection amplifier and vertical oscillator in television receivers. Interchangeable with 6BL7-GT but differs in having an improved section 1 for increased life as an oscillator, and controlled zero-bias plate current in both sections.

GENERAL — ELECTRICAL
Cathode: Coated Unipotential
  Heater Voltage, AC or DC   6.3 Volts
  Heater Current             1.5 Amperes
  Direct Interelectrode Capacitances, approximate [without ext shield]:   Section 1 / Section 2
    Grid to Plate   6.0 / 6.0 uuf
    Input           4.2 / 4.6 uuf
    Output          0.9 / 0.9 uuf
MECHANICAL
  Mounting Position: Any ; Envelope: T-9 Glass ; Base: B8-58, Short Intermediate-Shell Octal 8-Pin
  Basing EIA 8BD ; dims 3-5/16" max overall, 2-3/4" max seated, 1-9/32" max diameter (EIA 9-41)
  Terminal Connections: Pin1=Grid(Sec2), Pin2=Plate(Sec2), Pin3=Cathode(Sec2), Pin4=Grid(Sec1), Pin5=Plate(Sec1), Pin6=Cathode(Sec1), Pin7=Heater, Pin8=Heater

MAXIMUM RATINGS (Design-Center, Each Section):    [Vertical Oscillator Service / Vertical-Deflection Amplifier]
  DC Plate Voltage                 500 / 500 Volts
  Peak Positive Pulse Plate Voltage  --- / 2000 Volts
  Peak Negative Grid Voltage       400 / 250 Volts
  Plate Dissipation, Each Plate    10 / 10 Watts
  Total Plate Dissipation, Both Plates  12 / 12 Watts
  DC Cathode Current               60 / 60 mA
  Peak Cathode Current             210 / 210 mA
  Heater-Cathode Voltage:
    Heater Positive w.r.t. Cathode: DC Component 100 / 100 V ; Total DC and Peak 200 / 200 V
    Heater Negative w.r.t. Cathode: Total DC and Peak 200 / 200 V
ET-T1464 Page 1  8-57

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CHARACTERISTICS AND TYPICAL OPERATION
Average Characteristics, Each Section:   [three columns]
  Plate Voltage          150 / 250 / 250 Volts
  Grid Voltage           0 / -17 / -9.0 Volts
  Amplification Factor    - / - / 15
  Plate Resistance (approx.)  - / - / 2150 Ohms
  Transconductance        - / - / 7000 Micromhos
  Plate Current          65 / 4.0 / 40 Milliamperes
  Grid Voltage (approx.) Ib=50 uA   - / - / -23 Volts
Notes: Section 1 recommended for vertical oscillator service.
ET-T1464 Page 2  8-57

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[courbes seules] AVERAGE PLATE CHARACTERISTICS each section (Ip vs plate volts, grid 0..-50V) and (Ib/Ic vs plate volts, positive grid +40..0). Page 3

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[courbes seules] AVERAGE TRANSFER CHARACTERISTICS each section, Eb=250V (Ip vs grid volts, Eb=100..600V). AVERAGE CHARACTERISTICS each section (mu, Rp, Gm vs plate current, Eb=150/250V). Page 4