NJ7P SQL Tube Database Query

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6690
Medium-Mu Twin Triode

EIA Base & Outline

Mechanical Data

EIA Base ...................................... 8GQ

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Direct Interelectrode Capacitances (approx)

Triode 1
Input ......................................... 2.6 pf
Output ........................................ 1.7 pf
Grid to Plate ................................. 1.8 pf

Triode 2
Input ......................................... 2.6 pf
Output ........................................ 2.1 pf
Grid to Plate ................................. 1.8 pf

Maximum Ratings (Design Center Values)

Triode 1
Plate Voltage ................................. 120 V
Plate Dissipation ............................. 1.1 W

Triode 2
Plate Voltage ................................. 120 V
Plate Dissipation ............................. 1.1 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 100 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Transconductance .............................. 4800 µ
Plate Current ................................. 8.0 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

Thu, 02 Feb 2023 22:57:08 -0700