Voltage - Triode (under 100V) ·Triode
General-purpose receiving triode for voltage amplification, detection, oscillator, or Class-A service as documented by the manufacturer.
The 299 is a triode described in the Cunningham Radio Tube Manual for detector, amplifier, oscillator, rectifier, or power-output service as applicable to the type.
Bayonet base family 4-contact
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Published ratings and characteristics promoted from the approved datasheet.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Grid-filament capacitance
2.5 pF
Published direct interelectrode capacitance
Plate-filament capacitance
2.5 pF
Published direct interelectrode capacitance
Data set 02
Published operating points and test conditions from this source.
Heater/filament voltage
3.3 V
Published nominal
Heater/filament current
63 mA
Published nominal
Transconductance
425 uS
Published characteristic
Amplification factor
6.6
Published characteristic
Plate resistance
15500 Ohm
Published characteristic