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27 Vacuum Tube New and Used

$15.00
27 Vacuum Tube New and Used
27 Vacuum Tube New and Used

Home / Shop

27 Vacuum Tube New and Used

$15.00
Model Number: 27NEW
Type 27 5-pin indirectly heated triode tube for vintage AC radio detector and amplifier circuits. Available in new and used condition.
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Categories: Vacuum Tubes and Accessories
Manufacturer: Multiple Manufacturers
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  • Description
  • Specifications

The Type 27 (originally designated UY-227 or CX-327) is a 5-pin indirectly heated triode designed for detector and amplifier service in early AC-operated radio receivers. Introduced by RCA in 1927, it was the first widely adopted commercial tube to feature an isolated cathode heater structure, eliminating line-frequency hum in audio and detector stages.

  • Tube Function: Indirectly Heated Triode (Detector / AF Amplifier / Oscillator)

  • Base Design: 5-Pin Standard Base (UY5 / S5A)

  • Glass Shape: S-14, ST-14, or Globe (S-14)

  • Heater Voltage: 2.5 Volts AC / DC

  • Heater Current: 1.75 Amps

  • Maximum Plate Voltage: 250 Volts DC

  • Amplification Factor (Mu): 9

  • Plate Resistance: 9,000 Ohms

  • Transconductance: 1,000 micromhos

  • Cathode Heating Method: Indirect (Unipotential)