| Name | GU81M | | Type | pentode | | Cathode type | tugsten,carbidized,direct heating | | Application field | power amplification up to 50 MHz | | Brief application | amplification, oscillation | | Envelope | glass | | Cooling method | air | | Dimensions | 260mmx202mm | | Mass | 1 kg | | Filament voltage | 12.6 V | | Filament current | at most 11 A | | Mutual conductance | 4.5 to 6.5 mA/V | | Gain coefficient | 2.5 to 4 | | Output power | 0.45 kW | | Maximum anode voltage | 550 V | | Maximum operating frequency | 50MHz |
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