VOX AD50VT problem, hum/buzz

[joeltown]

Hoping someone can help. I bought a used, out of warranty AD50VT six months ago and really like it. Two days ago it failed. I was playing and my sound vanished and was replaced by a hum/buzz. Now, with nothing plugged into it and all controls on zero it just hums loudly. Plug in a guit, turn to 10, it hums just the same, no guit sound. The VOX AD50VT is a digital modeling amp with a valve power amp circuit utilizing a 12AX7 (ECC83) valve. Did that 12AX7 fail or am I looking at a digital side problem? Or a fuse...or? I appreciate any help. Thanks--JT

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