I know what you are suggesting Dave however I have my doubts it will ever be a problem here.

My long boards are at best about 12cm and held at each end so the there is the potential for flex in the centre. But at 15W and with the tubes so exposed on the top and unless it is a dire emergency I doubt this amp will ever hit the road or see a gig. It will most probably see out its days in someone's bedroom or if it's lucky get to live the life of Riley hooked up to a 1x12 in the air conditioned comfort of a small recording studio.

But one never knows. I'll check it out and might put a third stay under each of the long boards.