Ah yes, the old Chandler rackmount echos. I think Joe Satch was/is a big fan of those old units. Pretty great sounding from what I've heard. I have seen them come up on Ebay from time to time but they are not exactly a run of the mill item. Boss rack chorus hmm...never heard of that particular unit. You may be better off getting a rack TC Electronics unit for echos and chorus. Sorry dude that's some rare '80s stuff...don't know where to look for rack equipment. May I pry a bit, what do you have up your sleeve Ben? I didn't think it was possible to add anything else to The Rig Of Doom!
-Justin
'67 and '74 Fender Twin Reverbs, '74 Marshall 1987 lead mkII, Metro Superlead 100. Pedals from TC Electronic, Ibanez, Dunlop, BK Butler, Electro-Harmonix, Fulltone, Maestro/Gibson, Loopmaster switching, VoodooLab, Boss. Gibson and Fender guitars, Dimarzio pickups.