Do you see any red glow from the heaters inside the tubes – just trying to understand of there is any power at all?
This might sound repetitive, but I’ve lost count of the number of times this checklist has helped people solve their problems. Follow these steps, one by one, I know you have already done some of them. But get them out of the way.
Please do:
Won’t turn on
No Sound
Won’t switch to operate
Also Joe’s video on changing tubes and fuses is excellent
If you need to buy new fuses you can find the details here,