Bill,
you have to check the functionality of the diodes. If there goes RF through, you must find a voltage at the forward diode D2, i.e. abt 2.4V while applying 10W of RF. If there is nothing, the diode has passed away¡ If you connect the AT reverse, same at D1. Also faulty winding on the transformer possible!!!
73, Immo
Immo, DL5KB