Details
New old stock octal beam power tube with top cap and tubular T12 bulb. Various brands.
NSN/FSN = 5960002620158, 5960005194583, 5960005198246, 5960005576369, 5960006464734, 5960008095041, 5960008391529, 5960010895449
HP/Agilent Number = 1923-0029
Tektronix Number = 154-0112-00