TUBE: 7027A
FICHIER SOURCE: sheets/049/7/7027A.pdf
FABRICANT: RCA (Radio Corporation of America, Electron Tube Division, Harrison, N.J.)
ANNÉE: 8-59 (aout 1959)
LANGUE: en

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RCA 7027-A — BEAM POWER TUBE. For high-fidelity audio-amplifier applications. Supersedes Type 7027.

GENERAL DATA
Electrical:
Heater, for Unipotential Cathode:
  Voltage (AC or DC)    6.3   volts
  Current               0.9   amp
Direct Interelectrode Capacitances:
  Grid No.1 to plate                          1.5   µµf
  Grid No.1 to cathode & g3, g2, heater       10    µµf
  Plate to cathode & g3, g2, heater           7.5   µµf

Characteristics, Class A1 Amplifier:
  Plate Voltage              250    volts
  Grid-No.2 Voltage          250    volts
  Grid-No.1 Voltage          -14    volts
  Plate Resistance (Approx.) 22500  ohms
  Transconductance           6000   µmhos
  Plate Current              72     ma
  Grid-No.2 Current          5      ma

Mechanical:
  Operating Position    Any
  Maximum Overall Length    4.62"
  Maximum Seated Length     4.06"
  Maximum Diameter          1.63"
  Bulb     T12
  Base     Small-Wafer Octal 8-Pin with "950" Sleeve (JEDEC Group 1, No.B8-191)
  Basing Designation BOTTOM VIEW   8HY

Pin 1 - Grid No.2
Pin 2 - Heater
Pin 3 - Plate
Pin 4 - Grid No.2
Pin 5 - Grid No.1
Pin 6 - Grid No.1
Pin 7 - Heater
Pin 8 - Cathode, Grid No.3

PUSH-PULL AF POWER AMPLIFIER — Class AB1
Maximum Ratings, Design-Maximum Values:
  PLATE VOLTAGE                            600 max.  volts
  GRID-No.2 (SCREEN-GRID) VOLTAGE          500 max.  volts
  GRID-No.2 INPUT                          5 max.    watts
  PLATE DISSIPATION                        35 max.   watts
  PEAK HEATER-CATHODE VOLTAGE:
    Heater negative w.r.t. cathode         200 max.  volts
    Heater positive w.r.t. cathode         200 max.  volts
8-59  RADIO CORPORATION OF AMERICA  DATA 1

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Typical Operation with Fixed Bias: (values for 2 tubes)
  Plate Voltage                  400    450    540    volts
  Grid-No.2 Voltage              300    350    400    volts
  Grid-No.1 (Control-Grid) Voltage  -25  -30  -38   volts
  Peak AF Grid-No.1-to-Grid-No.1 Voltage  50  60  76  volts
  Zero-Signal Plate Current      102    95     100    ma
  Max-Signal Plate Current       152    194    220    ma
  Zero-Signal Grid-No.2 Current  6      3.4    5      ma
  Max-Signal Grid-No.2 Current   17     19.2   21.4   ma
  Effective Load Resistance (Plate to plate)  6600  6000  6500  ohms
  Total Harmonic Distortion      2      1.5    2      %
  Max-Signal Power Output        34     50     76     watts

Typical Operation with Cathode Bias: (values for 2 tubes)
  Plate Supply Voltage           400    380    425    volts
  Grid-No.2 Supply Voltage       300    380    425    volts
  Cathode Resistor               200    180    200    ohms
  Peak AF Grid-No.1-to-Grid-No.1 Voltage  57  68.5  86  volts
  Zero-Signal Plate Current      112    138    150    ma
  Max-Signal Plate Current       128    170    196    ma
  Zero-Signal Grid-No.2 Current  7      5.6    8      ma
  Max-Signal Grid-No.2 Current   16     20     20     ma
  Effective Load Resistance (Plate to plate)  6600  4500  3800  ohms
  Total Harmonic Distortion      2      3.5    4      %
  Max-Signal Power Output        32     36     44     watts

Maximum Circuit Values:
  Grid-No.1-Circuit Resistance: fixed-bias 0.1 max megohm / cathode-bias 0.5 max megohm

PUSH-PULL AF POWER AMPLIFIER — Class AB1 (g2 of each tube to tap on plate winding):
  Maximum Ratings, Design-Maximum Values:
  PLATE AND GRID-No.2 (SCREEN-GRID) SUPPLY VOLTAGE   600 max.  volts
  GRID-No.2 INPUT                          4.5 max.  watts
  PLATE DISSIPATION                        35 max.   watts
  PEAK HEATER-CATHODE VOLTAGE: 200/200 max volts
8-59  RADIO CORPORATION OF AMERICA  DATA 1

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Typical Operation (g2-to-tap config): (values for 2 tubes)
  Plate Supply Voltage           410    volts
  Grid-No.2 Supply Voltage       * (from taps)
  Cathode Resistor               220    ohms
  Peak AF Grid-No.1-to-Grid-No.1 Voltage  68  volts
  Zero-Signal Cathode Current    134    ma
  Max-Signal Cathode Current     155    ma
  Effective Load Resistance (Plate to plate)  8000  ohms
  Total Harmonic Distortion      1.6    %
  Max-Signal Power Output        24     watts

Maximum Circuit Values: Grid-No.1-Circuit Resistance cathode-bias 0.5 max megohm
Notes: ° without external shield ; ▲ dc component must not exceed 100 volts ;
* taps apply 43% of plate signal voltage to grid No.2 of each output tube.

OPERATING CONSIDERATIONS: The bulb becomes hot during operation. Free air circulation essential.
8-59  RADIO CORPORATION OF AMERICA  DATA 2

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[dimensions seules] T12 bulb, 1.56" max/1.44" min dia, 4.06"/4.62" max length, Small-Wafer Octal 8-Pin "950" sleeve JEDEC B8-191. 1.63" max base dia.

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[courbes seules — pas de données tabulaires] AVERAGE PLATE CHARACTERISTICS, Ef=6.3V, Grid#1=0, Ec2=50..450, plate mA vs plate V

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[courbes seules — pas de données tabulaires] AVERAGE CHARACTERISTICS, Ef=6.3V, Grid#2=300V, Ib & Ic2 vs plate V, Ec1=0..-50

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[courbes seules — pas de données tabulaires] AVERAGE CHARACTERISTICS, Ef=6.3V, plate=300V, Grid#2=300V, Ib & Ic2 vs grid#1 V

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[courbes seules — pas de données tabulaires] OPERATION CHARACTERISTICS PP Class AB1, Ef=6.3V, plate=540V, Grid#2=400V, Grid#1=-38V; power output & harmonic distortion (total/3rd/5th/7th) vs load resistance

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[courbes seules — pas de données tabulaires] AVERAGE PLATE CHARACTERISTICS TRIODE CONNECTION, Ef=6.3V, Grid#2 connected to plate, plate mA vs plate V, grid bias 0..-90