51J-4 Mystery Receivers

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What was this "X53786" modified version used for? Who made it?
BNC connectors - "To Ext Gain Cont", Null Meter", "Dif Meter"
Filter "X53619-2" with adjustment

Another 51J-4 with a similar tunable filter - thanks to Tom W3TA

This version is probably the forerunner to the LTV G133F (modified 51S-1) for airborne signals intelligence use?

Distinguishing characteristics

• New front panel - gloss black
• No phones or speaker jacks
• 2 fuseholders upper left
• Indicator lamp on mid-left
• Ejector handles and cabinet slides
• Did the rear panel have military-style connectors that were removed later on these two?

Appeared on ebay in 2003 -
			rear panel modified for later ham use?
Appeared on ebay in 2009 - dirty but shares the same characteristics - it has the handles and slides that match up with the G133F
Tuning knob is clearly a later add-on
rear panel modified for later ham use