[Amps] LK-500NT issue

[R. David Eagle]

Hello all...During the 160 contest last weekend, mr Murphy decided he would stop by and shut my amp down thus forcing me to run barefoot on 160 during the contest!  While I was calling CQ, I heard a pop noise from my amp and noticed my SWR went to infinity on the rig and I lost my grid/plate current.  I've been diggin through it this last week and have found absolutely nothing wrong.  I am still getting about 3300 plate voltage so I will assume the HV power supply is good.  The tubes are lit so the filament transformer is working.  As far as the high SWR issue goes, I went through the TR switching and that seems to work fine.  Then I seperated the tuned input from the TR switch and check that with my antenna analyzer and that seems to be passing RF fine on all bands.  I also checked the shunt resistors and they look fine too.

So does anybody out there in amp land have any suggestions/tips....alcohol... for this issue?

Thanks,

Dave
kb8nnu