Parameters:Filamentvoltage(Uf)=6.3V;Filamentcurrent(If)=0.17A;Anodevoltage(Ua)=120V;Anodecurrent(Ia)4.5~12mA;Thesecondgatevoltage(Ug2)=120V;Thesecondgatecurrent(Ig2)≤3.2mA;Transconductance(S)=5.2±1.4mA/V.(Electro