[Arran]

What I don't understand are the circuit differences between the model 60 chassis and the model 66 chassis. Given Philco's reputation for pinching pennies, why on Earth did they add an expensive part like an extra filter choke to the circuit, under the chassis?
  Speaking of penny pinching, I could not help but notice that they cheapened the cabinet they used on the model 66MB as opposed to the model 60MB. The 60MB has mahogany veneer on the top and sides, the 66MB only has it on the front whilst they used plain old poplar on the top and sides (or some other white wood) then used toner on them. I think that I would have swapped the extra choke to keep the veneer, if I were a Philco bean counter.
Regards
Arran