NJ7P SQL Tube Database Query

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6B8
Twin Diode - Semiremote-Cutoff Pentode

EIA Base & Outline

Application

Source ........................................ RCA RC-13 - 1937
Metal type used as combined detector, amplifier and avc tube. Tube requires octal socket. Similar in function to type 12C8.

Mechanical Data

Source ........................................ RCA RC-13 - 1937
Bulb .......................................... MT-8
Base Type ..................................... Small Wafer Octal 8-Pin
EIA Outline ................................... 8-4
EIA Base ...................................... 8E
Top Cap ....................................... Miniature
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-13 - 1937
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-13 - 1937
Input ......................................... 6.0 pf
Output ........................................ 9.0 pf
Grid to Plate ................................. 0.005 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 125 V
Plate Dissipation ............................. 2.25 W
Grid No. 2 Dissipation ........................ 0.3 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -3.0 V
Amplification Factor .......................... 800
Plate Resistance (approx) ..................... 600K Ω
Transconductance .............................. 1350 µ
Plate Current ................................. 10.0 mA
Grid No. 2 Current ............................ 2.3 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -21 V

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.

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

Wed, 08 Feb 2023 23:20:14 -0700