On 2023-Jan-21, at 10:14 AM, Chris via cctalk wrote: > And if your lids aren't gold plated, is the lid aluminum or some related > alloy?
Tin-plate on copper would be likely, easy to solder-seal on. Al would not solder on easily. Tin does make a nice plating. Even HP made some lab/computing equipment in the 60/70s with tin-plate (not solder 'tinned') PCBs including the edge-connector fingers, even though that is the era they were known for full-gold-plate PCBs.
