NJ7P SQL Tube Database Query

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6SD7GT
Semiremote-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6SK7
Substitutes ................................... 6AB7 6AC7 6AJ7
Source ........................................ ARRL HB - 1964

Mechanical Data

Source ........................................ ARRL HB - 1964
Bulb .......................................... T-9
EIA Outline ................................... 9-12
EIA Base ...................................... 8N

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ ARRL HB - 1964
Input ......................................... 9 pf
Output ........................................ 7.5 pf
Grid to Plate ................................. 0.0035 pf

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -2 V
Plate Resistance (approx) ..................... 700K Ω
Transconductance .............................. 4250 µ
Plate Current ................................. 9.5 mA
Grid No. 2 Current ............................ 3 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, 30 Jan 2023 01:59:11 -0700