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The
310A is an indirectly heated cathode type pentode having a separate suppressor
grid connection. It is intended for use in audio, carrier and radio frequency
voltage amplifiers, oscillators and modulators.
CHARACTERISTICS
Heater Voltage 10 V
Anode current 5.5 mA
Transconductance 1820 Ω
| Eb = 180V; |
Ec2 = 130V; |
| Ecl = -3V; |
Ec3 = 0 |
ELECTRICAL DATA
Heater Voltage 10 V
Heater current 320 Ma<
Direct Interelectrode Capacitances without external shield with external shield
(RETMA #311)
Grid to plate (maximum) 0.016 *0.010µµf
Input : gl to (h+k+g2+g3+i.s.) 6.0 *7.0µµf
Output : p to (h+k+g2+g3+i.s.) 13 *13µµf
* with external shield (RETMA #311) connected to cathode pin.
MECHANICAL DATA
Cathode Coated unipotential
Bulb ST12
Base Small 6-pin
Mounting Position Any
Maximum overall length 124.6 mm
Maximum seated height 108.7 mm
Maximum diameter 40 mm
Net weight 22 g
MAXIMUM RATINGS
Anode Voltage 250 V
Screen Grid Voltage 180 V
Anode Dissipation 2 W
Screen Grid Dissipation 0.4 W
Cathode Current 10 mA
Heater Cathode Voltage 150 V
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS
Heater Voltage 10 10 10 V
Anode Voltage 135 180 250 V
Screen grid voltage 135 135 135 V
Control Grid Voltage -3 -3 -3 V
Suppressor Grid Voltage 0 0 0 V
Anode Current 5.4 5.5 5.6 mA
Screen Grid Current 1.2 1.18 1.17 mA
Peak A-F Signal Voltage 3.0 1.5 2.1 V
Anode Resistance 0.75 0.9 1.15 MΩ
Transconductance 1800 1820 1840µΩ
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS (Cont)
Load resistance 20,000 10,000 100,000 Ω
Power Output 250 150 310 mW
Total Harmonic Distortion 8.5 6 6 %
Total Grid Voltage, approx, for
10µA Anode Current -9.5 -9.5 -9.5 V
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