TUBE: 6BK5
FICHIER SOURCE: sheets/127/6/6BK5.pdf
FABRICANT: Tung-Sol (Tung-Sol Electric Inc., Bloomfield/Newark NJ)
ANNÉE: 1957 (July 1, 1957, Plate #5036; curves April 1 1953, Plates #3187/#3188)
TYPE: PENTODE / beam power amplifier, 9-pin miniature (beam tetrode trade-named "pentode")

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6BK5 — TUNG-SOL — PENTODE, MINIATURE TYPE
COATED UNIPOTENTIAL CATHODE
HEATER: 6.3 VOLTS, 1.2 AMP, AC or DC — ANY MOUNTING POSITION
GLASS BULB T-6 1/2; bottom view miniature button 9 pin base 9BQ.
BOTTOM VIEW pins: H, H, K, G1, G1, G2, NC, NC, P (9BQ)
"The 6BK5 is a beam power amplifier utilizing the 9 pin miniature construction. It is
designed primarily for use in the power output stage of TV and radio receivers in which
only small driving voltages are available. It can also be used as a video amplifier in TV."

DIRECT INTERELECTRODE CAPACITANCES (with no external shield):
  GRID #1 TO PLATE: G1 to P .......... 0.06 µµf
  INPUT:  G1 to (H+K+G2+G3) .......... 13 µµf
  OUTPUT: P to (H+K+G2+G3) ........... 5 µµf

RATINGS (Design Center values):
  HEATER VOLTAGE ........................... 6.3 VOLTS
  MAX HEATER-CATHODE VOLTAGE:
    Heater neg wrt cathode, total DC+peak .. 200 VOLTS
    Heater pos wrt cathode: DC ............. 100 VOLTS
                            total DC+peak .. 200 VOLTS
  MAXIMUM PLATE VOLTAGE .................... 250 VOLTS
  MAXIMUM GRID #2 VOLTAGE .................. 250 VOLTS
  MAXIMUM POSITIVE DC GRID #1 VOLTAGE ...... 0 VOLTS
  MAXIMUM PLATE DISSIPATION ............... 9 WATTS
  MAXIMUM GRID #2 DISSIPATION ............. 2.5 WATTS
  MAX GRID #1 CIRCUIT RESISTANCE:
    Fixed bias .............. 0.1 MEGOHM
    Cathode bias ............ 0.5 MEGOHM

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TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS — CLASS A1 AMPLIFIER:
  HEATER VOLTAGE ........................... 6.3 VOLTS
  HEATER CURRENT ........................... 1.2 AMP
  PLATE VOLTAGE ........................... 250 VOLTS
  GRID #2 VOLTAGE ......................... 250 VOLTS
  GRID #1 VOLTAGE ......................... -5 VOLTS
  PEAK AF GRID #1 VOLTAGE ................. 5 VOLTS
  PLATE RESISTANCE (approx) ............... 100000 OHMS
  TRANSCONDUCTANCE ........................ 8500 µMHOS
  ZERO-SIGNAL PLATE CURRENT ............... 35 MA
  MAX-SIGNAL PLATE CURRENT (approx) ....... 37 MA
  ZERO-SIGNAL GRID #2 CURRENT ............. 3.5 MA
  MAX-SIGNAL GRID #2 CURRENT (approx) ..... 10 MA
  LOAD RESISTANCE ......................... 6500 OHMS
  TOTAL HARMONIC DISTORTION (approx) ...... 7 PERCENT
  POWER OUTPUT ............................ 3.5 WATTS
[+ pentode plate-mA vs grid#1 curve]

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[courbes seules — pas de données tabulaires]
(Ic2 vs grid#1; plate family Ib/Ic2 vs plate volts Ec2=250V, Ec1=0..-12.)

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[courbes seules — pas de données tabulaires]
(Plate family vs plate volts Ec1=0; power output & THD vs load resistance Eb=Ec2=250V, Ec1=-5V, Esig=3.54V.)