NJ7P SQL Tube Database Query

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7A8
Octode Converter

EIA Base & Outline

Substitute Data

Substitutes ................................... 7B8 6A8 6D8G
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Glass lock-in type used as converter in superhetrodyne circuits. Requires lock-in socket.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... T-9
Base Type ..................................... Lock-in 8-Pin
EIA Outline ................................... 9-30
EIA Base ...................................... 8U
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.15 A

Direct Interelectrode Capacitances (approx)

Mixer
Source ........................................ RCA RC-15 - 1947
Input ......................................... 7.5 pf
Output ........................................ 9 pf
Grid to Plate ................................. 0.15 pf

Characteristics and Typical Operation

Mixer
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Plate Resistance (approx) ..................... 50K Ω
Plate Current ................................. 3 mA
Grid No. 2 Current ............................ 3.2 mA

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

Mon, 27 Jun 2022 08:53:57 -0700