NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

7408
Beam Power Tube

EIA Base & Outline

EIA Base: 7AC
Source ........................................ RCA RC-29 - 1975

Application

Glass octal type used as output amplifier tube in high-quality sound systems. Requires octal socket.

Mechanical Data

EIA Base ...................................... 7AC

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 9 pf
Output ........................................ 7.5 pf
Grid to Plate ................................. 0.7 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 350 V
Grid No. 2 Voltage ............................ 315 V
Plate Dissipation ............................. 14 W
Grid No. 2 Dissipation ........................ 2.2 W

Characteristics and Typical Operation

Class A Amplifierlifer
Plate Voltage ................................. 60 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ 0 V
Plate Current ................................. 100 mA
Grid No. 2 Current ............................ 22 mA

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -12.5 V
Peak Grid No. 1 Voltage........................ 12.5 V
Plate Resistance (approx) ..................... 50K Ω
Transconductance .............................. 4100 µMho
Plate Current (Zero Signal) ................... 45 mA
Plate Current (Maximum Signal) ................ 47 mA
Grid No. 2 Current (Zero Signal) .............. 4.5 mA
Grid No. 2 Current (Maximum Signal) ........... 7 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 4.5 W

A horizontal ribbon.

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A horizontal ribbon.

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Tue, 09 Aug 2022 06:30:48 -0700