NJ7P SQL Tube Database Query

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99
Low-Mu Triode

EIA Base & Outline

EIA Base: 4D
Source ........................................ RCA R-10 - 1932

Application

Source ........................................ RCA R-10 - 1932
The '99 types are three-electrode, general purpose tubes designed for dry-cell operation. The low power consumption of these tubes makes them applicable to portable receivers and services where power economy is important.

Mechanical Data

Bulb .......................................... T-8
EIA Base ...................................... 4D

Electrical Data

Heater Voltage ................................ 3.3 DC V
Heater Current ................................ 0.063 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 2.5 pf
Output ........................................ 2.5 pf
Grid to Plate ................................. 3.3 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 90 V
Grid No. 1 Circuit Resistance
Self Bias .................................. Ω
Bulb Temperature (At Hottest Point) ........... °C

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 90 V
Grid No. 1 Voltage ............................ -4.5 V
Amplification Factor .......................... 6.6
Plate Resistance (approx) ..................... 15.5K Ω
Transconductance .............................. 425 µMho
Plate Current ................................. 2.5 mA

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Thu, 18 Aug 2022 09:48:49 -0700