Electronic Tube & Vacuum Tube Catalog

Plate Resistance: rp

Transconductance: gm (mA/V)

Amplification Factor: μ

Maximum Plate Voltage: Va(max)

Maximum Plate Dissipation: Pa(max)

Maximum Screen Voltage: Vs(max)

Rectifier Nominal Output Current: I(DC)

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12A7
Voltage Pentode or Tetrode (with diode)Pentode-RectifierDissimilar
PDF Google eBay
Base
7-K
Socket code
UX7
Electrical Summary
Heater 12.6 V / 300 mA
Plate S2: 135 V
Screen S2: 135 V
Rectifier S1: 30 mA
V Drop S1: 15 V
rP S2: 102,000 Ω
gm S2: 0.975 mA/V
μ S2: 100
Sections
2
7 pins - UX7 - Small 7-contact (0.75-inch pin circle)
Combination half-wave rectifier and power-amplifier pentode designed for compact AC/DC receivers, integrating power-supply rectification with audio output amplification.
Named For Audio Output Power Pentode
Source PDFs (7)

Electrical Summary

General Summary

12A7

Voltage Pentode or Tetrode (with diode)Pentode-RectifierDissimilar

Heater	12.6 V / 300 mA
Plate	S2: 135 V
Screen	S2: 135 V
Rectifier	S1: 30 mA
V Drop	S1: 15 V
rP	S2: 102,000 Ω
gm	S2: 0.975 mA/V
μ	S2: 100

7 pins - UX7 - Small 7-contact (0.75-inch pin circle)

Combination half-wave rectifier and power-amplifier pentode designed for compact AC/DC receivers, integrating power-supply rectification with audio output amplification.

Named For Audio Output Power Pentode

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