NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

EL503
Beam Power Pentode

EIA Base & Outline

EIA Base: 9QB

Substitute Data

Preferred Substitutes ......................... 8278
Source ........................................ Phillips DS 09/70

Application

Source ........................................ Phillips DS 09/70
Beam pentode intended for use as an AF power amplifier.

Mechanical Data

Source ........................................ Phillips DS 09/70
Bulb .......................................... T-9
Base Type ..................................... Magnoval
Maximum Overall Height ........................ 3.38 In.
Maximum Seated Height ......................... 3.00 In.
Maximum Diameter .............................. 1.188 In.
EIA Base ...................................... 9QB

Electrical Data

Source ........................................ Phillips DS 09/70
Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.05 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ Phillips DS 09/70
Input ......................................... 22.5 pf
Output ........................................ 13.5 pf
Grid to Plate ................................. 1.7 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ Phillips DS 09/70
Plate Voltage ................................. 300 V
Grid No. 3 Voltage ............................ 300 V
Plate Dissipation ............................. 25 W
Grid No. 2 Dissipation ........................ 4.0 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ Phillips DS 09/70
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -12.5 V
Plate Resistance (approx) ..................... 7.3K Ω
Transconductance .............................. 24000 µMho
Plate Current ................................. 100 mA
Grid No. 2 Current ............................ 8.0 mA

Push Pull Class AB1 Amplifier
Source ........................................ Phillips DS 09/70
Plate Voltage ................................. 265 V
Grid No. 2 Voltage ............................ 265 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Plate Current ................................. 200 mA
Grid No. 2 Current ............................ 16.0 mA
Power Output (approx) ......................... 40 W

A horizontal ribbon.

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A horizontal ribbon.

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Mon, 05 Dec 2022 02:10:55 -0700