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Preferred Substitutes ......................... 44
Source ........................................ RCA RC-13 - 1937
Source ........................................ RCA R-10 - 1932
The '39 is a super-control pentode recommended for use primarily as a radio-frequency amplifier, intermediate-frequency amplifier and superheterodyne first detector in automobile receivers and in sets operated from d-c power lines. It has a heater-cathode which is designed for d-c operation. This feature together with that of general freedom from microphonic and battery circuit disturbances makes the '39 well suited to mobile service and other applications where complete d-c operation is desirable. The '39 is very effective in reducing cross-modulation and modulation-distortion over the usual range of signal voltages without the use of antenna potentiometers or auxiliary volume control switches. This super-control characteristic makes the tube uniquely adaptable to r-f and i-f stages of receivers employing automatic volume control.
The use of a suppressor is an important feature of the '39 because it permits variation in tube structure so as to obtain a high plate resistance without impairing other desired characteristics. In comparison with the usual type of screen grid tube operated under similar conditiona, the '39 has a much higher plate resistance and a considerably increased range of voltage swing. Furthermore, a high value of mutual conductance is maintained.
The suppressor is connected inside the tube to the cathode. During operation of the tube, the suppressor eliminates the secondary emission effects which limit the voltage swing permissible in the usual screen grid tube at low plate voltage, that is, at a plate voltage approximately equal to thc screen voltage. The suppressor in the '39, therefore, makes possible the efficient operation of this tube at a relatively low plate voltage. This may greater than, equal to, or slightly less than the recommended screen voltage.
Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-12
Base Type ..................................... Small 5-Pin
EIA Outline ................................... 12-01
EIA Base ...................................... 5F
Top Cap ....................................... Small Metal
Mounting Position ............................. Any
Source ........................................ RCA RC-13 - 1937
Bulb .......................................... ST-12
EIA Outline ................................... 12-6
Source ........................................ RCA R-10 - 1932
Heater Voltage ................................ 6.3 DC V
Heater Current ................................ 0.3 A
Source ........................................ RCA RC-13 - 1937
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Pentode
Source ........................................ RCA R-10 - 1932
Input ......................................... 4.0 pf
Output ........................................ 10.0 pf
Grid to Plate ................................. 0.007 pf
Pentode
Source ........................................ RCA RC-13 - 1937
Input ......................................... 3.5 pf
Output ........................................ 10.0 pf
Grid to Plate ................................. 0.007 pf
Pentode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 90 V
Pentode
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 90 V
Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 360
Plate Resistance (approx) ..................... 375K Ω
Transconductance .............................. 960 µ
Plate Current ................................. 4.4 mA
Grid No. 2 Current ............................ 1.3 mA
Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 530
Plate Resistance (approx) ..................... 540K Ω
Transconductance .............................. 980 µ
Plate Current ................................. 4.4 mA
Grid No. 2 Current ............................ 1.2 mA
Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 750
Plate Resistance (approx) ..................... 750K Ω
Transconductance .............................. 1000 µ
Plate Current ................................. 4.5 mA
Grid No. 2 Current ............................ 1.2 mA
Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 360
Plate Resistance (approx) ..................... 375K Ω
Transconductance .............................. 960 µ
Plate Current ................................. 5.6 mA
Grid No. 2 Current ............................ 1.6 mA
Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 750
Plate Resistance (approx) ..................... 750K Ω
Transconductance .............................. 1000 µ
Plate Current ................................. 5.8 mA
Grid No. 2 Current ............................ 1.4 mA
Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 1050
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 1050 µ
Plate Current ................................. 5.8 mA
Grid No. 2 Current ............................ 1.4 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, 11 Aug 2022 14:32:40 -0700