Quote:
Originally Posted by jr_tech
Have you tried a different 6SL7? Possibly this one has grid emission. 
Could there be a carbon path in the tube socket between pins 5 and 4 that is pulling the grid more positive than it should be?
You really need to get better voltage measurements... can you get another HV probe or fix the one you have?
jr |
I tried several 6sl7 no change as for my hv probe tossed it last year could not fix it. Carbon path , well anything is possible but I need to find out how to know if there is a carbon path taking place befor I get into changing that socket. Do you have an idea how to determine if there is a carbon path. I don't here anything arcing nor do I smell any corona from hv. Pin 5 SAMs shows 320 Vdc and I find odd that the 6.8 meg at pin 5 gets warm but the other 6.8 don't.