6BA6/EF93
7 pin miniature
RF pentode vacuum tube
6.3v /.3 amp heater
Matched pair
Gray plate (GE?) Looks like GE made.
Selected/matched by Gold Aero early testing service
out of California.
The 6BA6 was used in tube based receivers and tuners.
Tube replacement usually requires an alignment,
this matched set could save one service.