I have an Eico HF-87 with no OPTs, and a pair of early Dynaco A-470 OPTs with no chassis or PT. Trying to find the Eico iron has been fruitless (at least at a reasonable price), and the basic tap setup of the OPTs is the same (except that the Eico OPTs had 32ohm taps not found on the A-470s). I might as well drop the A-470s onto the Eico chassis to build a working amp. Any thoughts or warnings about the mash-up?