I have a '68 Versatone amp that I use very little, partly because it's irreplaceable, but also because its Utah special-design speaker is quite fragile. I have an extra one, but its foam surround has disintegrated and I'm leery of having it reconed by just anybody. And I really doubt that the one that's in the amp will last much longer. If anyone here is has any familiarity with these amps, I'd appreciate suggestions for a replacement speaker. Power handling isn't really a consideration, since the output is 70w, tops. I've heard that JBL D-120's worked great in these amps, but they're no longer available. What's a good alternative?