18 watt OT good or bad

[dude]

Years ago put this OT in a new built, loud squeal, switched plate wires, still squeal. Used another OT, build played good. This OT has been sitting in my parts for years. Any way l can test it out of a circuit.


Plate to plate 494 ohms
Blue wire Plate to CT 251 ohms
Brown wire Plate to CT 243. ohms

[labb]

might give this a try...https://www.premierguitar.com/articles/the-super-secret-transformer-tester-1