NJ7P SQL Tube Database Query

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56
Medium-Mu Triode

EIA Base & Outline

EIA Base: 5AEIA Bulb: 12-0

Substitute Data

Substitutes ................................... 27
Source ........................................ RCA R-10 - 1932

56
Medium-Mu Triode

EIA Base: 5AEIA Bulb: 12-5

Substitute Data

Substitutes ................................... 27
Source ........................................ RCA RC-13 - 1937

Application

Source ........................................ RCA R-10 - 1932
The 56 is a three-electrode tube of the uni-potential heater-cathode type recommended for use as detector, amplifier, or oscillator in a-c receivers designed for it. This tube is characterized by its small overall size, its relatively low heater power consumption, its high mutual conductance, and its comparatively high amplification factor. The 56 is especially useful in resistance-coupled audio-frequency amplifiers.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-12
Base Type ..................................... Small 5-Pin
EIA Outline ................................... 12-0
EIA Base ...................................... 5A
Mounting Position ............................. Any

Source ........................................ RCA RC-13 - 1937
Bulb .......................................... ST-12
EIA Outline ................................... 12-5

Electrical Data

Source ........................................ RCA R-10 - 1932
Heater Voltage ................................ 2.5 V
Heater Current ................................ 1.0 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ RCA R-10 - 1932
Input ......................................... 3.2 pf
Output ........................................ 2.2 pf
Grid to Plate ................................. 3.2 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 250 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -13.5 V
Amplification Factor .......................... 13.8
Plate Resistance (approx) ..................... 9500 Ω
Transconductance .............................. 1450 µMho
Plate Current ................................. 5 mA

Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 100 V
Grid No. 1 Voltage ............................ -5 V
Amplification Factor .......................... 13.8
Plate Resistance (approx) ..................... 12K Ω
Transconductance .............................. 1150 µMho
Plate Current ................................. 2.5 mA

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Mon, 04 Jul 2022 17:58:24 -0700