[jerryhawthorne]

I think your right, looks like a short between the HV center tap and 5V filaments.   With the wires still free, check from 8 to chassis and from 6 to chassis.  How do the wires look coming out of the transformer?  Good solid insulation?  It is possible the wires are shorting together inside the bell.  Next step would be to remove the transformer and take off the end bells to review the internal connections.  
Jerry