491 Spectrum Analyzer with Custom Modifications


I saw this 491 on the auction site yesterday with a custom modification.

Pictures here https://groups.io/g/TekScopes/album?id=265112

The listing ended last night. I was not the purchaser (sadly, the price was very good).

Here is a link to the original listing https://www.ebay.com/itm/184704993611?nma=true&si=RZU6h9umVBH9zpUNGWIszvRCZ2M%253D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557

I'm just curious if anyone can shed some light on what the modification is and does (or if anyone on this group was the purchaser, because that would be cool)

-- Jeff Dutky

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