NJ7P SQL Tube Database Query

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3-500Z
High-Mu Power Triode

EIA Base & Outline

Application

Source ........................................ Varian DS 3-15-68
A compact power triode intended to be used as a zero-bias class-B amplifier in audio or radio-frequency applications.

Mechanical Data

Source ........................................ Varian DS 3-15-68
Base Type ..................................... 3-500Z
EIA Outline ................................... 3-500Z
EIA Base ...................................... 3-500Z
Top Cap ....................................... HR-6
Cathode ....................................... Vertical base up or down
Bulb Contact ..................................

Electrical Data

Source ........................................ Varian DS 3-15-68
Filament Voltage .............................. 5.0 V
Filament Current .............................. 14.5 A

Direct Interelectrode Capacitances (approx)

Source ........................................ Varian DS 3-15-68
Input ......................................... 7.4 pf
Output ........................................ 0.07 pf
Grid to Plate ................................. 4.1 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ Varian DS 3-15-68
Plate Voltage ................................. 4000 V
Plate Dissipation ............................. 500 W
Plate Current ................................. 400 mA
Bulb Temperature (At Hottest Point) ........... 200 °C

Characteristics and Typical Operation

Class B GG Amp
Source ........................................ Varian DS 3-15-68
Plate Voltage ................................. 3000 V
Grid No. 1 Voltage ............................ 0 V
Grid No. 1 Current ............................ 115 mA
Amplification Factor .......................... 160
Plate Current (Zero Signal) ................... 160 mA
Plate Current (Maximum Signal) ................ 370 mA
Driving Power ................................. 30 W
Load Resistance ............................... 5000 Ω
Power Output (approx) ......................... 750 W
Maximum Frequency ............................. 110 MHz

Class B GG Amp
Source ........................................ Varian DS 3-15-68
Plate Voltage ................................. 2500 V
Grid No. 1 Voltage ............................ 0 V
Grid No. 1 Current ............................ 120 mA
Amplification Factor .......................... 160
Plate Current (Zero Signal) ................... 130 mA
Plate Current (Maximum Signal) ................ 400 mA
Driving Power ................................. 30 W
Load Resistance ............................... 3450 Ω
Power Output (approx) ......................... 600 W
Maximum Frequency ............................. 110 MHz

Class B GG Amp
Source ........................................ Varian DS 3-15-68
Plate Voltage ................................. 2000 V
Grid No. 1 Voltage ............................ 0 V
Grid No. 1 Current ............................ 130 mA
Amplification Factor .......................... 160
Plate Current (Zero Signal) ................... 95 mA
Plate Current (Maximum Signal) ................ 400 mA
Driving Power ................................. 30 W
Load Resistance ............................... 2750 Ω
Power Output (approx) ......................... 500 W
Maximum Frequency ............................. 110 MHz

Class B GG Amp
Source ........................................ Varian DS 3-15-68
Plate Voltage ................................. 1500 V
Grid No. 1 Voltage ............................ 0 V
Grid No. 1 Current ............................ 130 mA
Amplification Factor .......................... 160
Plate Current (Zero Signal) ................... 65 mA
Plate Current (Maximum Signal) ................ 400 mA
Driving Power ................................. 30 W
Load Resistance ............................... 1600 Ω
Power Output (approx) ......................... 330 W
Maximum Frequency ............................. 110 MHz

Push Pull Class B AF Amp
Source ........................................ Varian DS 3-15-68
Plate Voltage ................................. 3000 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 244 mA
Amplification Factor .......................... 160
Plate Current (Zero Signal) ................... 600 mA
Plate Current (Maximum Signal) ................ 1540 mA
Driving Power ................................. 25 W
Load Resistance ............................... 8600 Ω
Power Output (approx) ......................... 1420 W

Class C Oscillator/Amplifier
Source ........................................ Varian DS 3-15-68
Plate Voltage ................................. 3500 V
Grid No. 1 Voltage ............................ -75 V
Grid No. 1 Current ............................ 115 mA
Amplification Factor .......................... 160
Plate Current ................................. 300 mA
Driving Power ................................. 22 W
Power Output (approx) ......................... 850 W
Maximum Frequency ............................. 110 MHz

Class C Modulated Amplifier (Plate)
Source ........................................ Varian DS 3-15-68
Plate Voltage ................................. 3000 V
Grid No. 1 Voltage ............................ -100 V
Grid No. 1 Current ............................ 120 mA
Amplification Factor .......................... 160
Plate Current ................................. 275 mA
Driving Power ................................. 25 W
Power Output (approx) ......................... 640 W
Maximum Frequency ............................. 110 MHz

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

Mon, 27 Jun 2022 07:35:55 -0700