Shiva silenced? Powers on, but no sound. Clues?

[BostonGuitarSB]

The power tubes light up proper amber, but when engaging from standby, no sound. Checked cable and speaker cab with my Smallbox and all is good. hmmmm...

 

[Aristocat]

Maybe an issue with fuse or a blown Power Tube? Not an expert but I'd look there first.

 

[glip22]

Replace your HT fuse. Should be labeled .500 maybe.