That schematic is going to go a long way toward getting help. I'd like to hear some expert opinions on adding 100 ohm screen stability resistors which should eliminate any arc'ing with the screen grid. (And maybe that is what happened here.) I'm not an expert in bias schemes, but it might be beneficial to put 10 ohm resistors on the OP 7189's cathodes to measure the currents. (Need expert opinions here because I wouldn't want to disturb the bias if this isn't the right thing to do here.)
Of course fixing the output transformer should be high on the list..... Maybe Heyboer <sp?> could rewind it?
Of course fixing the output transformer should be high on the list..... Maybe Heyboer <sp?> could rewind it?