Vox Ac15 Excessive Buzz/Hum

[68degrees]

Hi,
Been having excessive buzzing in my Ac15. Tried new tubes, deferent speakers, power supply, different plugs and changed the wire between the input jack and circuit board (that when touched, the problem became worse). Nothing has worked yet, has anyone had this same problem?
Thanks for your help.

 

[japetus]

Is your guitar grounded correctly?

 

[68degrees]

Is your guitar grounded correctly?

It does it just as much with no guitar in the input.

 

[Monkey Man]

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