hello , the blue labels on the top of my ARC5 transmitters read T19/ARC-5 and T22/ARC5 . they are in really nice shape and i aim to start work making up the connectors as soon as i have the SCR399 station really sorted. i am still after the cover plate for one of the SCR274 transmitters if any kind person has one. there must be hundreds around somewhere ! alan G4GEN