Help Identifying A VERY Old Vacumm Tube?
I recently got a 1920's RCA Radiola 60 Tube Radio , and when I was servicing it I kinda accidently dropped a tube and the vaccumm seal broke and the glass broke. on the side of the tube it says
"Philco H 5" it has four pins two bigger two smaller.
Here are some pictures of it for reference.