I can second that. I recently bought a flock of them (for spares/parts for the first one I bought), because they were so cheap on eBay - several I got for $25 + shipping. Most of the ones I bought came without probes, etc, but I managed to round up a very complete set of stuff without spending too much money. Tek documentation is incredibly thorough, and easy to obtain; and they are very easy to work on (in terms of accessability, etc). Etc, etc, etc. The speeds/etc you are looking for are within their range. When filled with 4 16-channel data acquisition cards, you get 64 channels. They seem to have quite powerful triggering/etc capabilities, and they are easy to use/control. The only possible issue (for some people) is that the memories aren't large (although you can chain identical DACs together to get slightly longer memories). And I'll echo Tony's comments - ECL is pretty much de rigeur, and as for making your own probes, fuhgeddaboutit; the 1240's probe pods (there are two kinds, TTL-only, and 'pick a voltage') contain giant custom chips. Noel