Hi,

I recently re-found a homebrew receiver that I built back in the 80s and
am going to try to get it going again.

My question is regarding the Kokusai MF-455ZU-21H mechanical filter.
This was a popular filter in its day and I wonder how well they hold up
over time? I know some of these things had foam that
melts/disintegrates into mush. Any comments or observation on this
particular type would be appreciated.

Thanks,
Bill WX4A/KP4