NJ7P SQL Tube Database Query

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2AF4
Medium-Mu Triode

EIA Base & Outline

EIA Base: 7DKEIA Bulb: 5-2

Substitute Data

Preferred Substitutes ......................... 2DZ4 2T4
Substitutes ................................... 2AS2

Application

Miniature type used as local oscillators in uhf television receivers covering the frequency range of 470 to 890 MHz. Requires miniature 7-contact socket.

Mechanical Data

EIA Outline ................................... 5-2
EIA Base ...................................... 7DK

Electrical Data

Heater Voltage ................................ 2.35 V
Heater Current ................................ 0.6 A
Heater Warm-up Time ........................... 11 s
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
Total DC and Peak ....................... 50 V
Heater Negative with Respect to Cathode
Total DC and Peak ....................... 50 V

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 2.2 pf
Output ........................................ 0.45 pf
Grid to Plate ................................. 1.9 pf

For other characteristics and typical operation, see 6AF4

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Thu, 18 Aug 2022 16:11:31 -0700