TUBE: 8417
FICHIER SOURCE: sheets/168/8/8417.pdf
FABRICANT: SYLVANIA ELECTRIC PRODUCTS INC., Electronic Tube Division, Emporium PA
ANNEE: May 1965
TYPE: Beam-power pentode
PAGES: 4

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SYLVANIA engineering data service - 8417
QUICK REFERENCE DATA: The Sylvania Type 8417 is a beam-power pentode featuring a T-12 bulb and an octal 6-pin base. Intended for service in high power, high-fidelity audio equipments and capable of 100 watts output in push-pull circuitry. Also finds application as a regulator tube.

MECHANICAL DATA
  Bulb ............. T-12
  Base ............. Short Shell Octal 6-Pin
  Outline .......... See Drawing
  Basing ........... Modified 7S
  Mounting Position  Any
  Cathode .......... Coated Unipotential

ELECTRICAL DATA
HEATER CHARACTERISTICS
  Heater Voltage ... 6.3 Volts
  Heater Current ... 1600 Ma
  Maximum Heater-Cathode Voltage:
    Heater Negative wrt Cathode, Total DC and Peak ... 200 Volts
    Heater Positive wrt Cathode, DC ................. 100 Volts
    Heater Positive wrt Cathode, Total DC and Peak .. 200 Volts

DIRECT INTERELECTRODE CAPACITANCES
  Grid No.1 to Plate ... 0.9 pf
  Input ................ 22 pf
  Output ............... 9.0 pf

RATINGS (Design Maximum Values)
  Plate Voltage ............ 660 Volts Max
  Grid No.2 Voltage ........ 500 Volts Max
  Plate Dissipation(1) ..... 35 Watts Max
  Grid No.2 Dissipation(2) . 5 Watts Max
  Cathode Current .......... 200 Ma Max
  Grid No.1 Circuit Resistance:
    Fixed Bias ............. 0.1 Megohm Max
    Cathode Bias ........... 0.25 Megohms Max

AVERAGE CHARACTERISTICS
  Plate Voltage ............ 300 Volts
  Grid No.2 Voltage ........ 300 Volts
  Grid No.1 Voltage ........ -12 Volts
  Plate Current ............ 100 Ma
  Grid No.2 Current ........ 5.5 Ma
  Transconductance ......... 23,000 umhos
  Plate Resistance ......... 16,000 Ohms
  Amplification Factor (Triode Connected) ... 16.5
  Grid Voltage for Ib=1 Ma . -37 Volts

TYPICAL OPERATION - Class AB1 Ultra-Linear Push-Pull(3)   [Values for 2 Tubes]
  Plate Supply Voltage ..... 445 Volts
  Grid No.1 Voltage ........ -25 Volts
  Peak AF Grid to Grid Voltage ... 45 Volts
  Zero Signal Plate Current  146 Ma
  Maximum Signal Plate Current ... 314 Ma
  Effective Load (Plate to Plate) . 3500 Ohms
  Total Harmonic Distortion  2.5 Percent
  Maximum Signal Power Output ..... 70 Watts

TERMINAL DIAGRAM (7S, bottom view): G2(4) G1(5), P(3), H(2) H(7), K/G3(8). [Octal: P pin3, H pins2&7, K+G3 pin8, G2 pin4, G1 pin5]

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8417 (suite)
TYPICAL OPERATION (Cont'd) - Class AB1 Pentode Connected   [Values for 2 Tubes, deux colonnes]
                              (col1)  (col2)
  Plate Supply Voltage ..... 400     560     Volts
  Grid No.2 Supply Voltage . 275     300     Volts
  Grid No.1 Voltage ........ -13     -15     Volts
  Peak AF Grid to Grid Voltage ... 24  29    Volts
  Zero Signal Plate Current  150     124     Ma
  Maximum Signal Plate Current ... 294 290   Ma
  Zero Signal Screen Current 4.4     3.6     Ma
  Maximum Signal Screen Current .. 34  39    Ma
  Effective Load (Plate to Plate)  2800 4200 Ohms
  Total Harmonic Distortion  2.5     2.5     Percent
  Maximum Signal Power Output .... 65  100   Watts

NOTES:
(1) Essential to maintain free circulation of air around the tube for proper cooling.
(2) Grid No.2 dissipation may reach 8 watts during intervals of maximum speech and music signals.
(3) Screen tapped at 40% of primary turns. Plate current includes screen current.

===== PAGE 3 =====
[courbes seules] AVERAGE PLATE CHARACTERISTICS (Ef=rated, Ec2=300V ; et Ec2=250V) - familles Ib et Ic2 vs plate voltage, Ec1 de 0 a -12V.
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[courbes seules] AVERAGE TRANSFER CHARACTERISTICS (Ef=rated, Eb=500V; Ec2=300 & 250V) + AVERAGE PLATE CHARACTERISTICS (Triode Connected, grid No.2 to plate, Ec=0 a -26V).