I would think that Matamp and Martamp 's amps would probably have a large degree of power tube distortion, so I am guessing you can't win about getting reverb / delay after the overdrive?
unless you take the signal from the amp head into a dummy load, and then put that into a clean power amp... No idea if that would work, or break anything, but I read EVH did it (so I guess it probably did break something :P )
That Goldstar looks tasty