John,
SN 4507 incorporated all prior Elecraft changes in the original
construction.
Unless the previous owner has added some non-Elecraft modifications, the
only possible changes would be the Keying Bandwidth Mod and the PLL
Temperature stability mod.
I suggest you download the instructions for those 2 mods from the
Elecraft website so you can compare the boards on your K2 with the
instructions for each of these two mods - if the parts mentioned in the
mod instructions are not present, then the answer is easy - it is not
installed.
73,
Don W3FPR
John Reilly wrote:
I just purchased a used K2 (s/n 4507). When It arrives, how can I tell
which mods and revisions have been installed?
Thanks,
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