turn a GK mb212 into head and cabinet

Would be a shame to risk ruining a combo amp that is great as is. Better idea is to budget for a proper head.

 

I agree with @wave rider . It makes no sense to destroy a perfectly good combo.

 

Not do it.

The metal for the housing is not made as rigid as one made to be a stand alone head, combos rely on the cab as part of the structure and protection of the head section.

You may need to make a cover to protect the guts.

Some, not sure of this model will not have the side of the amp that touches the cab enclosed as the cab body will do that.

You will have this.

 

This is a modification that showed up in the Fender Rumble Club known as the eric-B modification. It’s actually a very useful mod, and I did it on my Rumble 500 combo. I use a GK MB500 or MB200 to run the Rumble combos internal 2X10’s. I haven’t tried using the Fender amp to run a separate cabinet because I prefer the clean GK voicing. Here’s the link, with discussion and pretty detailed instructions. Fender Rumble V3 mod: separating amp and speaker Good luck if you go this route.