Mesa D800 Noise

[cgg199]

My Mesa D800 has recently started making a lot of noise when using it and after tying to troubleshoot, I'm in need of some advice.

 

With nothing plugged into the input the amp is fine. From there I've plugged in a few different basses to see how I reacted and things went as follows:

 

Dual humbucker bass - no noise when using humbuckers, lots of buzzing when coil split, more than would be expected of single coils.

 

Passive Jazz bass V with Nordstrand Hum cancelling pickups - no noise when pickups blended at 50/50, loud buzzing when blended anywhere other than dead centre.

 

Shuker PJ5 - Some noise when P pickup isolated, lots of buzzing when introducing any bridge pickup at all. Aguilar hum cancelling bridge pickup, and is the same in both active and passive settings.

 

The same noise has happened on a few gigs now and at home so I've ruled the power source. It seems what I'd expect of 60hz hum, but no idea why it's happening on my basses with him cancelling pickups. It's also a new thing that hasn't been present in the past. I've attached a shirt video of the sound.

 

Any ideas as to what could be causing it, or anything I can do to reduce the noise as currently it's not workable on a gig? Any help is much appreciated!