Sunn Stagemaster Help?

[Darkpoke4166390]

but yea, i got this sunn stagemaster head less than a week ago, its amazingly loud, really intresting too with its wattage selection knobs for each channel 1w-120w or 240w with both channels.

but besides that

the thing i need is, a footsitch that goes to 3 channels like it describes in the 84 add. Channel A, Channel B, Channel A and B.

problem.

i can only use channal A and AB, not B

so dose anyone have any ideas on how to craft a footswitch that can do that? or a footswitch that i could buy?

ive tired a y cable, that dosent work, and a variety of stero footswitches, all produce the same results of channels A and AB.

help?!