NJ7P SQL Tube Database Query

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1608
Power Triode

EIA Base & Outline

Mechanical Data

Bulb .......................................... ST-16
Base Type ..................................... Medium 4-Pin Ceramic Bayonet
EIA Outline ................................... 16-1
EIA Base ...................................... 4D
Top Cap .......................................
Cathode .......................................
Mounting Position .............................
Minimum Useful Screen Diameter ................ In.
Bulb Contact ..................................

Electrical Data

Heater Voltage ................................ 2.5 V
Heater Current ................................ 2.5 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 8.5 pf
Output ........................................ 3 pf
Grid to Plate ................................. 9 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 425 V
Negative Grid No. 1 Voltage ................... -200 V
Plate Input ................................... 40 W
Plate Dissipation ............................. 20 W
Cathode Current ............................... 120 mA

Characteristics and Typical Operation

Class C Oscillator/Amplifier
Plate Voltage ................................. 350 V
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 4300 Ω
Peak Grid No. 1 Voltage........................ 150 V
Grid No. 1 Current ............................ 20 mA
Plate Current ................................. 95 mA
Driving Power ................................. 3 W
Power Output (approx) ......................... 20 W

Class C Oscillator/Amplifier
Plate Voltage ................................. 425 V
Grid No. 1 Voltage ............................ -90 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 4500 Ω
Peak Grid No. 1 Voltage........................ 155 V
Grid No. 1 Current ............................ 20 mA
Plate Current ................................. 95 mA
Driving Power ................................. 3 W
Power Output (approx) ......................... 27 W

Class B PushPull Amplifier
Plate Voltage ................................. 350 V
Grid No. 1 Voltage ............................ -10 V
Peak Grid No. 1 Voltage........................ 120 V
Plate Current (Zero Signal) ................... 30 mA
Plate Current (Maximum Signal) ................ 190 mA
Driving Power ................................. 2.2 W
Load Resistance ............................... 3800 Ω
Power Output (approx) ......................... 38 W

Class B PushPull Amplifier
Plate Voltage ................................. 350 V
Grid No. 1 Voltage ............................ -10 V
Peak Grid No. 1 Voltage........................ 120 V
Plate Current (Zero Signal) ................... 30 mA
Plate Current (Maximum Signal) ................ 190 mA
Driving Power ................................. 2.2 W
Load Resistance ............................... 4800 Ω
Power Output (approx) ......................... 50 W

Class B Amplifier
Plate Voltage ................................. 350 V
Grid No. 1 Voltage ............................ -10 V
Peak Grid No. 1 Voltage........................ 35 V
Grid No. 1 Current ............................ 4 mA
Plate Current ................................. 70 mA
Driving Power ................................. 2 W
Power Output (approx) ......................... 7 W

Class B Amplifier
Plate Voltage ................................. 425 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 40 V
Grid No. 1 Current ............................ 4 mA
Plate Current ................................. 70 mA
Driving Power ................................. 2 W
Power Output (approx) ......................... 10 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 325 V
Grid No. 1 Voltage ............................ -80 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 4000 Ω
Peak Grid No. 1 Voltage........................ 150 V
Grid No. 1 Current ............................ 20 mA
Plate Current ................................. 85 mA
Driving Power ................................. 2.7 W
Power Output (approx) ......................... 16 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 350 V
Grid No. 1 Voltage ............................ -80 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 400 Ω
Peak Grid No. 1 Voltage........................ 165 V
Grid No. 1 Current ............................ 20 mA
Plate Current ................................. 85 mA
Driving Power ................................. 3 W
Power Output (approx) ......................... 18 W

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Mon, 27 Jun 2022 11:49:24 -0700