Information on production changes is given with respect to the “run” numbers and “code” numbers. Some Philco sets, such as Model 60, were all Code 121 even though changes were made to the circuitry over its three-year production run. Model 89 is a good example, again: in 1935, they changed the det-osc tube in the 89 from a Type 36 to a Type 77 yet even though a new Service Bulletin (schematic) was issued, it continued to be “Code 123.” Philco was not consistent with this code numbering, however. A Model 89 Code 121 only has three knobs and is an AM-only set, while a Model 89 Code 123 has four knobs and receives AM and the old “police” band. Model 89, different code numbers indicated production changes, as noted above. In SOME (not all, see explanation below) later models, i.e.
The 71 and 91 Baby Grands were initially called “Code 121,” while the 71 and 91 console versions were “Code 221.” These codes changed during the 1932 season as production changes were made. Each of these had slight differences in the cathedral (Baby Grand) and console versions chiefly, the addition of twin speakers in the consoles. Philco began doing the code numbering in 1932 with their Models 71 and 91.
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