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.

50FK5
Power Pentode

EIA Base & Outline

EIA Base: 7CV

Substitute Data

Substitutes ................................... 50FA5
Source ........................................ ARRL HB - 1964

Mechanical Data

EIA Base ...................................... 7CV

Electrical Data

Heater Voltage ................................ 50 V
Heater Current ................................ 0.1 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 17 pf
Output ........................................ 9 pf
Grid to Plate ................................. 0.65 pf

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 110 V
Grid No. 2 Voltage ............................ 115 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 62 Ω
Plate Resistance (approx) ..................... 14K Ω
Transconductance .............................. 12.8K µMho
Plate Current ................................. 32 mA
Grid No. 2 Current ............................ 8.5 mA
Load Resistance ............................... 3K Ω
Power Output (approx) ......................... 1.2 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 20:07:58 -0700