Last week I bought a very clean and good looking about 65 years old tube tester: the Hickok I-177B with the adapter set MX-949 A/U. The military tube tester I-177B is designed around 1950 as successor of the WW2 model. The I-177B tube tester is made for the American Forces, and also used in NATO countries. This unit was used by the Dutch Army.
Because of the special climate conditions in Korea a great number of tube testers had some special treatment. MFP, stands for Moisture and Fungi Proof. The inside of the tube tester is covered with a special coating to protect the tester from moisture en fungi.
First impressions: looks like new accept... one of the rectifiers has a broken base see pictures and there seems to be some repairs done seen on the second picture left underside.