NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

21EX6
Beam Power Amplifier

EIA Base & Outline

EIA Base: 5BT

Mechanical Data

Bulb .......................................... T-12
Base Type ..................................... Short Medium Shell Octal 5-Pin
EIA Outline ................................... 12-21
EIA Base ...................................... 5BT
Top Cap ....................................... C1-1
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 21.5 V
Heater Current ................................ 0.6 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 22 pf
Output ........................................ 8.5 pf
Grid to Plate ................................. 1.1 pf

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 175 V
Grid No. 2 Voltage ............................ 175 V
Grid No. 1 Voltage ............................ -30 V
Plate Resistance (approx) ..................... 8.5K Ω
Transconductance .............................. 7700 µMho
Plate Current ................................. 67 mA
Grid No. 2 Current ............................ 3.3 mA

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A horizontal ribbon.

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Tue, 29 Nov 2022 00:31:13 -0700