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.

38HK7
Diode - Beam Power Tube

EIA Base & Outline

EIA Base: 12FS

Substitute Data

Preferred Substitutes ......................... 38HE7
Source ........................................ RCA RC-29 - 1975

Application

Duodecar type used in tv receiver applications. The diode is used for damper service and the beam power unit for horizontal-deflection amplifier service. Requires duodecar 12-contact socket.

Mechanical Data

EIA Base ...................................... 12FS

Electrical Data

Heater Voltage ................................ 37.8 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Diode
Output ........................................ 9 pf

Pentode
Input ......................................... 19 pf
Output ........................................ 8 pf
Grid to Plate ................................. 0.38 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 500 V
Plate Dissipation ............................. 10 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 130 V
Grid No. 2 Voltage ............................ 120 V
Grid No. 1 Voltage ............................ -22 V
Plate Resistance (approx) ..................... 6.2K Ω
Transconductance .............................. 8800 µMho
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 2.8 mA

Hortz Defl Amplifier
DC Plate Supply Voltage ....................... 500 V
Peak Positive-Pulse Plate Voltage ............. 5000 V
Peak Negative-Pulse Plate Voltage ............. 0 V
DC Grid No. 3 Voltage ......................... 150 V
DC Grid No. 2 Voltage ......................... -330 V
Peak Negative-Pulse Grid No. 1 Voltage ........ 230 V
Average Cathode Current ....................... 800 mA

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, 11 Aug 2022 13:32:40 -0700