Hi All,
I didn't want to post until I actually had it on my bench, but I've taken possession of a BFNIB Tek TH and IM distortion analyzer. Burned in by the vendor for 72 hours, it exceeds (which I would expect it to) factory specs in all regards.
I plan to repair and/or calibrate most of my other analyzers and oscillators against the 501. I'll then put a few of them on preBay. That would include the Boonton (which crapped out), an HP 8903E (which also crapped out) another Tek 501 (which also crapped out), an Eico factory wired 902, and a couple of Heath IM-5248s. All will be brought up to factory spec, unless it's cost-prohibitive to do so--in which case I'll supply residual base readings so you can apply appropriate fudge factors.
The other, probably more germane, service I'll be able to provide is evaluation/calibration of analyzers that y'all already have. I don't expect any of you to be chomping at the bit for this service, but it's nice to know that we have a certified standard for distortion and noise that we can rely on.