Offered are (4) Philco 24 Globe Tetrode Tubes. These are Screen Grid RF amplifiers from early AC radios. Each of these tubes tests good on the Jackson dynamic testers with % transconductance readings as follows:  90%, 87%, 90% and 89% (good range is from 70% to 130% on the tester). The tubes show no shorts or inter-element leakage. The tubes have mesh type plates and side button getters with all good silver flashing. They have hot-stamped base graphics. Three tubes have identical production codes as follows: 1F and one has K1. These tubes were OEM types in the iconic Philco radio models 20, 70 and 90 cathedral radios of the early 1930's as well as the other Superheterdyne radios of the 1930 vintage.  Pick up these tubes for your own Philco radio requiring a nice upgrade. Mouse over the photo images to zoom in. NO RESERVE!! Thanks for looking.