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Guys,

I'm curious to know how "rare" these early scopes are any more. Tek seems to have made these early changes fairly quickly, even before the actual SN B250K. I currently posses a B177K and it seems to mostly be made up of later components. The A9 is late, and the A5 (vertical amp) seems to be somewhat later: non-IC discrete components matching the change schematic, but the post B250K four digit component numbers. It includes components on the earlier change schematic that aren't present on the later board.

And as Raymond noted, the first SN starts at B010100?

So I wonder if there are few surviving examples?

I know 465s are like the VW Beetle of oscilloscopes. But even early "split window" Bugs are pretty valuable now. It seems appropriate to try to preserve surviving examples. But I'm biased.

Stephen seems to be in possession of of a true early scope. Stephen, is the A5 board a discrete component or IC version? Does it have a surviving time/div know without "LOCK KNOBS"? And a simple "A" HORIZ DISPLAY button? What other notable differences are there on the early pre SN B250K scopes?

Dave