Image 111-SC-1561 showcases a Type A-R-5 Vacuum Tube Detacher Set used during World War One. The photograph was taken by a photographer from the Signal Corps in 1919. The image features the equipment, with the description noting its ...
The Philips 1561 tube base modification
1 X 1561 PHILIPS-MINIWATT TUBE. BLACK RIBBED PLATES. 1950s PROD. CD ENA