Antique radios, Old Time Radios
Radiotronics
Experimenters' Bulletin - Technical Bulletin
Periodical Number 133September / October 1948
created by: Franz Harder (25.Aug.19)
available by: Martin Kent
Attachments
Currently no attachments available.
Some example tube pages for sets you can see there:
Pentagrid-Converter Heptode
1R5 (1940)