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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UCL11
Power - Tetrode (NOT beam)Tetrode-TriodeDissimilarCommon cathode
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Base
—
Socket code
Y8A
Electrical Summary
Heater 62 V / 100 mA
Plate S1: 250 V / 0.6 WS2: 250 V / 9 W
Screen S2: 250 V / 1.5 W
Ik max S2: 75 mA
rP S2: 18,000 Ω
gm S1: 1.6 mA/VS2: 9 mA/V
μ S1: 66
Sections
2
Y8A - Steel-tube 8-contact
Combination high-gain triode and power-output tetrode for audio-frequency equipment. The triode supplies voltage amplification while the larger tetrode section provides roughly 4 W Class A loudspeaker output, integrating successive audio stages in one envelope.
Named For Audio Output Power Tetrode
Source PDFs (8)

Electrical Summary

General Summary

UCL11

Power - Tetrode (NOT beam)Tetrode-TriodeDissimilarCommon cathode

Heater	62 V / 100 mA
Plate	S1: 250 V / 0.6 WS2: 250 V / 9 W
Screen	S2: 250 V / 1.5 W
Ik max	S2: 75 mA
rP	S2: 18,000 Ω
gm	S1: 1.6 mA/VS2: 9 mA/V
μ	S1: 66

Y8A - Steel-tube 8-contact

Combination high-gain triode and power-output tetrode for audio-frequency equipment. The triode supplies voltage amplification while the larger tetrode section provides roughly 4 W Class A loudspeaker output, integrating successive audio stages in one envelope.

Named For Audio Output Power Tetrode

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