NJ7P SQL Tube Database Query

A horizontal ribbon.

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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.

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A horizontal ribbon.

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Thu, 30 Jun 2022 03:55:36 -0700