[Milsurplus] GRT-21/23

[Glenn Little WB4UIV]

I have a module that I got at a hamfest.
It is ITT assy 8004890G1.
It is a Driver/Power Amplifier, RF.
Can anyone verify that this is part of the GRT-21 or GRT-23 transmitter?
These only put out 10 Watts.
This amplifier looks like it is capable of much more with the proper heatsink.
The output modules (3) are assy number 8004892G1 and each have two RF 
power transistors.
The transistors are TRW PT6702.
The transistors have a date code of 7451.
The PA modules look like this 
http://www.bpbsurplus.com/lc/cart.php?target=product&product_id=16983&category_id=256

Google just finds voltage regulators and people that want you to get 
a quote for the transistors.

Any help as to what this came from and the device ratings greatly appreciated.

73
Glenn
WB4UIV