Vintage PHILCO TRANSITONE PT3 1942 Tube Radio. Made in United States approximately 1942. 7A8 7B7 7C6 50L6GT 35Z3. Superheterodyne (common); ZF/IF 455 kHz. Loudspeaker: Electro Magnetic Dynamic LS (moving-coil with field excitation coil). Model: 42-PT-3 – Philco. According to Ramirez, Philco model 42-PT-3 (wooden cabinet with photofinish front) is one of the very few new models introduced by Philco in early 1942 after U. It has the same chassis as model 42-PT2 (bakelite cabinet). PLEASE EXAMINE PHOTOS FOR CONDITION.