Sunn 300t blowing main fuse.
Hey everyone. Ill keep it short and to the point. My sunn head keeps blowing the main fuse, and only the main fuse. Powers up fine but as soon as I switch on the standby you get a quick buzz and it shuts off. so at least the fuse is doing its job. I've read threads about the tube fuses blowing but nothing about the main. I figure the issue is either the tube bias/balance or the transformer. I had it retubed last December and biased and balanced at Hendrix sound in Orlando. Thoughts?
basses: Ibanez SR1000EFM Prestige and SR1206/ Epiphone EB-3
rig: Sunn 300T & Yorkville 410B