[Milsurplus] What is it from?

[Lloyd KK7IZ]

RF Amplifier ,  part of R-276/GR.
P/N 505-0175-90
2 tubes
schematic on end
Connector still bagged.
Have not been able to find ref to R276/GRR
See at
http://img.photobucket.com/albums/v618/skyrider28/IMG_4164.jpg
http://img.photobucket.com/albums/v618/skyrider28/IMG_4165jpg
http://img.photobucket.com/albums/v618/skyrider28/IMG_4166jpg
Anybody need it? If not it's parts
Thanx
Lloyd  KK7IZ
kk7iz at cox.net
480-620-7145