[timmy]

Does anyone know when what the indicators are when a 7jp4 crt is getting tired or the phosphor’s are beginning to degrade. I have a bright tube but it’s like having no contrast all white until turning the brightness down some and it’s good I have a new 7jp4 I tried and it don’t do this. so this tube is really bright but don’t know if the emissions are low or phosphors are tired.