I have been enjoying my minimax plus with dual Burson's in U1\U2 and the Dexa's in U6\U7 for a few months now and couldn't be happier. I find the sound to be stunning. Although with some recordings I like the sound of the Burson's with a Amperex orange NOS tube from pearl cryo better. You sacrifice some of the vivid resolution with the tube as well as output level, but you get a nicer, softer sound when listening to harsher recordings. I bought the flying lead version of the Burson's and trimmed them down to about 3\16" and carefully lined them up to the socket holes and wiggled them in. It was a delicate procedure, but they are in firmly now, and they clear the lid. I later thought of a better way of doing it which I'll cut and paste from another forum to save the typing.
for those who wish to roll with the Burson opamps without the hassle of having to buy the flying lead version, and deal with the shady process of trimming and worrying about the leads bending and potentially snapping off. The original reason I didn't go with the much sturdier dip lead version was because of the clearance issues with the lid. I've thought of a solution. All you need to do is buy some sheets of a product such as:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=268-030
to use as a spacer\gasket. Stick it to the inside of the lid (not sure how many layers it will take, could just be 1 but buy 4 they are cheap enough), cut a little square out where the bursons line up with the lid, and also a square where the vent holes for the tube cooling are. You will also need to find some longer machine screws to attach the lid and make some little holes in the material where they need to go through. This method will effectively allow enough clearance for the dip version, plus you will reap the benefits of a sound deadened lid! Why didn't I think of this before?
