[Test-Equipment] Need info on Noise figure meter

[Edward J White]

Hi Gang:
I am looking for information on a General Microwave Model 506A-2 
Automatic noise Figure meter. This unit has been modified with a 
connector and a noise head for a noise tube 5722 Sylvania.the noise head 
looks to be home made.
Here I am looking for something to check out some amps and I have 
received it when I purchased a 1296 amp and dish antenna.
Any info will be great
Ed
WA3BZT