[Ron Ramirez]

Purchased as a 42-PT3 which is identified at radio museum as a 5 tube wooden cabinet with the same tube lineup as the PT7.

Next time, try here first.
http://philcoradio.com/gallery2/

Now. You say your chassis has six tubes yet you only list five?

Tube lineup of this radio is 50L6GT, 7C7, 7B7, 35Z3, and 7A8 (maybe).

That's five tubes.

The 42-PT2, 42-PT3, and 42-PT7 uses these five tubes: 7A8, 7B7, 7C6, 35Z3, 50L6GT.

Model 42-PT10 uses six tubes: 7C7, 7A8, 7B7, 7C6, 50L6GT, 35Z3.

Please confirm whether you have five or six tubes.

If five, it is OK. If six, then you have a 42-PT7 with a 42-PT10 chassis, which means that someone in the past took two radios and made one. Maybe they had a 42-PT10 and broke the (Bakelite) cabinet, liked the RF amp which the 42-PT10 has, so stuck the chassis in a 42-PT7 cabinet?