[Keith]

There is more info on the safety caps here
http://www.justradios.com/X1Y2capacitors.html

[Ron Ramirez]

Early production 47-1227 sets used a bakelite block which contained two capacitors as the AC line bypass. This was changed in Run 3 to two separate mica caps.

The same change was made to model 47-1230.

A plug for Chuck: this is one example of the kind of information you can get in his service packets.
http://www.philcorepairbench.com/schematics.htm

As you have two mica caps as the AC line filter, as stated previously, they should be replaced with two X1/Y2 safety caps.