3A5
Triode · DHT · 7-pin Miniature · 1950
“Battery power tube.”
Medium-gain triode for voltage amplification applications
Datasheet ↗SPICE
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
GAIN18%
POWER1%
DRIVE89%
LINEARITY91%
TYPICAL OPERATING POINT
EXECUTIVE SUMMARY
The 3A5 is a directly-heated triode from RCA, introduced around 1950. It provides a gain factor (μ) of 18 with 10.6kΩ plate resistance. Commonly used in portable power applications. Battery power tube.
APPLICATIONS
Line stage
Generic triode portable power stage
• Hi-Fi stereo
HISTORY
Introduced1950ManufacturerRCAEquivalentsDL94 equiv
Golden AgeSPECIFICATIONS
Heater Voltage1.4V
Heater Current0.1A
Max Plate Voltage90V
Max Power0.5W
Sensitivity1.7 mA/V
Gain Factor18
Internal Impedance10.6kΩ
Pinout7-pin Miniature
Era1950
RarityModerate