NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

50B5
Beam Power Tube

EIA Base & Outline

EIA Base: 7BZ
Source ........................................ RCA RC-15 - 1947

Application

Miniature type used in output stage of compact ac/dc receivers. Requires miniature 7-contact socket.

Mechanical Data

Bulb .......................................... T-5 1/2
Base Type ..................................... Miniature Button 7-Pin
EIA Outline ................................... 5-3
EIA Base ...................................... 7BZ
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 50 V
Heater Current ................................ 0.15 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 13 pf
Output ........................................ 6.5 pf
Grid to Plate ................................. 0.5 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 117 V
Grid No. 2 Voltage ............................ 117 V
Plate Dissipation ............................. 5.5 W
Grid No. 2 Dissipation ........................ 1.25 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 110 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 1 Voltage ............................ -7.5 V
Peak Grid No. 1 Voltage........................ 7.5 V
Amplification Factor .......................... 49
Plate Resistance (approx) ..................... 10K Ω
Transconductance .............................. 7500 µMho
Plate Current (Zero Signal) ................... 49 mA
Plate Current (Maximum Signal) ................ 50 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 8.5 mA
Load Resistance ............................... 2.5K Ω
Power Output (approx) ......................... 1.9 W

A horizontal ribbon.

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A horizontal ribbon.

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Tue, 29 Nov 2022 00:04:55 -0700