Data set 01
1947 Standard Valves
Published operating points and test conditions from this source.
SECTION 1
Triode
Capacitance
Grid-anode capacitance
6.8 pF
Grid-cathode/filament capacitance
5.8 pF
Anode-cathode/filament capacitance
5.5 pF
Power - Triode Single (under 10W) ·Triode
3AI44AY
Special-limits tested telephone repeater triode for professional communications amplification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- MEDIUM4BAYONET
- Base pins
- 4
- Nominal heater
- 4.5 V / 1 A
Description
Repeater triode; 3A/I44AY is the specially tested replacement form of 3A/I44A.
Socket description
Medium 4-contact bayonet base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- MEDIUM4BAYONET
- Base pins
- 4
- Nominal heater voltage
- 4.5 V
- Nominal heater current
- 1 A
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 2000 Ω
- Transconductance
- 0.00115 S
- Amplification factor
- 2.3
- Max plate voltage
- 190 V
- Max plate dissipation
- 5 W
- Max cathode current
- 60 mA
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.