VM Wiring Question...

[connell2k1]

Yeah, it's pretty rare, was built in Leeds, UK for a short period of time. I am also retarted, as it's an Ibanez "Starfield" (not stagecraft lol sorry) stereo rack tube amp

[mety]

Ah, Starfield, I remember that name!

So from what I can gather, you are using two separate amp/speaker set-ups, fed from the Switchblade, which is fed from your guitar.
If this is the case then the HD400 inserted between the Switchblade outputs and the amps' inputs should rid you of the hum.
(As you assumed correctly in your earlier post.)