Well I'm no expert but I do know that you don't have to pay $200 to change a few caps and resistors, which is all that's involved in "blackfacing". I've seen price quotes from $40 to $75 that seem reasonable. And the only problem with SF amps after about 70-71 is that the baffles are not removable, which should only matter if you want to install different size speakers. The best source for this info I've found is the FDP forum. Go ask there and you'll likely find out all you need to know, even to do it yourself if you want. I did.