Solid State I.F. Amplifer Replaces a tube?

[Pirate Wez]

Hello Everybody,

I have a military box that contains three gizmos. These gizmos look like
solid state I.F. replacement tubes. If this is true I don't know which
tube they replace? Can anyone help me? They have a seven pin miniature
base. The military box data is:

2C448A-427
AMPLIFIER, I.F., AM-427/U
4300 KC +-4 KC
R.C.A. DWG. 628784-502
1 EACH
3374-PHILA-52-01
ADMIRAL CORPORATION
CHICAGO, ILLINOIS
METHOD 1A-8  MVP
DATE PKD  3-53

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