Details
New old stock metal octal power pentode. Various brands.CV207 is the British Common Valve number.
NSN/FSN = 5960001888565 (6AG7Y), 5960002280033, 5960005354558 (6AG7Y), 5960005373953, 5960006154728 (6AG7Y), 5960006179075, 5960008260149 (6AG7Y)
Signal Corps Number = VT-247
HP/Agilent Number = 1923-0016
Tektronix Number = 154-0012-00