[COLOR="DarkRed"]....there is that famous drum magazine interview with Tony Williams from about 20+ years ago.....where the interviewer asks "is that cymbal you use on XXXX a crash or a ride ?"
to which Tony replied:
"A cymbal is a cymbal".
I never put much weight into the label 'crash' or 'ride'.
IMHO a Sweet (which IS a good ride cymbal) doesn't make a great crash...too heavy and the decay is too slow. Particularly the latter aspect is where rides often fail as crashes....while the 'bite' on the initial strike may sound good.....the decay is just way too slow and it just stays in the air too long.
The thing about old A's are...given that they weren't named as models....it's hard to just offer advice on the right kind of one. Basically, a 'ride' cymbal of a medium weight or lighter (20" at under 2200g, 22" at under 2600g, etc) OR with a profile where the weight is up at the bell and bow and the edge shows wobble on the ride.....is gonna make a good crashable ride. So basically, if there's no soundfile for a vintage ride...you gotta go on a hunch.
McJ as usual hit it right, too: the contemporary Turkish handmades do a great job of both just because they are inherently full of overtones. So even though they may be heavy...they just have so much lushness to them that they sound nice as crashes. (I used to have an Isty Vezir crash cymbal which was just perfect....over time I forgot there was even the weight penned in under the bell and when I looked at it.....it was almost 1600g !!! From any of the big 3, a 1600g 16" cymbal would be no more useful than a hubcap, basically. But it worked on a Turkish handmade).
Bos, Istanbul, Masterwork and the like. Check out the soundfiles at cymbalsonly.com
Lucky has it right too...basically, any "Dark" ride is gonna be on the thinner side, so in a lotta contexts it will sound good as a crash.....
Another one which works really well if you don't wanna pay the top dollar for a new Turkish cymbal ...is...believe it or not....a Sabian El Sabor AA. I love this line. It has all of the aspects I noted above. Heavy in the center, thin at the edges. Also, it has a great unlathed big and heavy bell for Funk. On top of all of this, its edge is flanged a touch (not like a china, but sorta like the old Sabian Sound Control series)...which makes a great place to crash it, and also causes the decay after the crash to diminish medium-fast. It was marketed as a salsa cymbal for that very reason...you could smash it with a Timbale stick and it'd crash superbly.[/COLOR]