NJ7P SQL Tube Database Query

A horizontal ribbon.

Note: Please do not link down into my pages. I change this directory structure often and your links will not work correctly.

A horizontal ribbon.

7591A
Power Pentode

EIA Base & Outline

EIA Base: 8KQ
Source ........................................ RCA RC-29 - 1975

Application

Glass octal type used as audio-frequency power-output tube in high-quality audio application. Requires octal socket.

Mechanical Data

EIA Base ...................................... 8KQ

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.8 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 10 pf
Output ........................................ 5 pf
Grid to Plate ................................. 0.25 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 550 V
Grid No. 2 Voltage ............................ 440 V
Plate Dissipation ............................. 19 W
Grid No. 2 Dissipation ........................ 3.3 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -10 V
Peak Grid No. 1 Voltage........................ 10 V
Plate Resistance (approx) ..................... 29K Ω
Transconductance .............................. 10200 µMho
Plate Current (Zero Signal) ................... 60 mA
Plate Current (Maximum Signal) ................ 75 mA
Grid No. 2 Current (Zero Signal) .............. 8 mA
Grid No. 2 Current (Maximum Signal) ........... 15 mA
Load Resistance ............................... 3K Ω
Power Output (approx) ......................... 11 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 350 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -15.5 V
Peak Grid No. 1 Voltage........................ 31 V
Plate Current (Zero Signal) ................... 92 mA
Plate Current (Maximum Signal) ................ 130 mA
Grid No. 2 Current (Zero Signal) .............. 13 mA
Grid No. 2 Current (Maximum Signal) ........... 28.6 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 30 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -21 V
Peak Grid No. 1 Voltage........................ 42 V
Plate Current (Zero Signal) ................... 66 mA
Plate Current (Maximum Signal) ................ 144 mA
Grid No. 2 Current (Zero Signal) .............. 9.4 mA
Grid No. 2 Current (Maximum Signal) ........... 30 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 45 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Peak Grid No. 1 Voltage........................ 28 V
Plate Current (Zero Signal) ................... 82 mA
Plate Current (Maximum Signal) ................ 94 mA
Grid No. 2 Current (Zero Signal) .............. 11.5 mA
Grid No. 2 Current (Maximum Signal) ........... 22 mA
Load Resistance ............................... 9K Ω
Power Output (approx) ......................... 28 W

A horizontal ribbon.

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

Please enter the tube number:

This database contains data on thousands of tubes. Every effort has been made to insure the accuracy of this reference, however, I assume no liability for the results of using information contained herein.

Other Tube Search Engines:
Frank's Electron Tube Pages

Complete Tube Manuals:
Tube Manual Index from NJ7P

A horizontal ribbon.

(c) 1994-2021 by William A. Beech, NJ7P

Thu, 18 Aug 2022 19:09:44 -0700