New old stock vintage US made Sylvania 1AF4 tubes. These are in the original factory crates and individually boxed.
1AF4 is a battery pentode that normally operates at 90V or less plate (anode) voltage and has a very low power filament (1.4V at 25 ma) that will operate off a battery.
For more data please see: http://scottbecker.net/tube/sheets/127/1/1AF4.pdf