01A
Triode · DHT · UX-4 · 1924
“Dawn of audio. Thoriated tungsten charm.”
Low-mu triode with excellent linearity for driver and line stages
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
GAIN8%
POWER3%
DRIVE89%
LINEARITY95%
EXECUTIVE SUMMARY
The 01A is a directly-heated triode from RCA·GE, introduced around 1924. It provides a gain factor (μ) of 8 with 11.0kΩ plate resistance. Commonly used in preamp applications. Dawn of audio. Thoriated tungsten charm.
APPLICATIONS
Voltage amplifierLine stage
Generic triode preamp stage
• Hi-Fi stereo• Headphone amp
HISTORY
Introduced1924ManufacturerRCA·GEEquivalents201A, 301A, VT-30
Pre-WarSPECIFICATIONS
Heater Voltage5V
Heater Current0.25A
Max Plate Voltage135V
Max Power1W
Sensitivity0.725 mA/V
Gain Factor8
Internal Impedance11.0kΩ
PinoutUX-4
Era1924
RarityCollector
SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.