> > > ** During an HV- to gnd arc, > no -- but during a VHF/UHF > parasite, an > 8877 is capqable of >50A-pk > cathode current (Ik). > However, 50A would > torpedo a 10A transistor (Q1). Doesn't your proposed opto controlled bias switching transistor have the same torpedo problem during a parasitic?? Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net