The serial number plate just says "TU10"; and it's not in its original DEC rack, so any label/plate there is no longer available. But the front door says "TU10 7 CHANNEL", and the head shows 7 tracks (since someone might have changed the head, and not been able to replace the door). I prefer to actually check the Flip Chips, since one ought to do that anyway to make sure they are all there (hence my previous description of it as a "TU10 master drive ... [which] has all its Flip Chips"). (There's a list here: http://gunkies.org/wiki/TU10 including locations, if anyone ever needs it.) I am perfectly capable of assessing the technical situation from the technical documentation (which is available), and have already done so. What I really need is some idea of its value (I haven't a clue). I am aware that its exact configuration and condition will affect the value, but I thought "a 7-track TU10 master drive .. in good condition, [with] all its Flip Chips" would be enough to get to the ball-park. I had previously looked online for that, but was unable to find a copy. Can you point me at one? Thanks. AFAICT, the only significant difference is the head; the Flip Chip suite is the same for both, since the per-channel boards are all 9-track, and simply leave the last two bits disconnected when used with a 7-track head (see e.g. drawing # TU10-0-09, note "9 Track Only"). Of course, the drive has to be able to say (to the controller) whether it's a 7-track or 9-track. Drawing # TU10-0-07 shows (center) an incoming signal on pin AJ1 of the M514 board (slot 21) called "7 CH", that signal is intended to ground the input, so there's a jumper to ground on the backplane to indicate 7/9 (A21C2, per the MM, Appendix A.5). Noel