Psvane ECC81 HiFi Series / 1 matched pairProduct parameters: The high dual three pole small nine pin tube is used for voltage amplification and drive push pull amplification in the amplifier circuit. Hot wire heating UH 6. 3 (parallel) 12. 6 (string) V IH 0. 30 0. 15 A Limit value for A1 zoom (each side) Anode voltage 300 V Gate voltage 50 V Anode dissipation power 2. 5 W Voltage between hot wire cathodes (pk) 90 V Gate resistance 1 M at self bias 0. 25 M at fixed bias Interelectrode