Does any one owns tube portable radios that have F.M.?

[Josef]

Nice radio, but the heater cell looks extremly cappy too. Fortunately Mr. Heigel, a well known collector here in Austria developed a quite simple but effective replacement circuit:
Just replace the cell with an 4700uF cap and parallel two diodes connected in series with each other to the cap producing stable 1,4V:

https://www.radiomuseum.org/r/radione_r20.html