07-18-2008, 01:31 PM
Production Change Notes usually extended a couple years from the introduction of a model. Some models had extensive changes. The Model 60, for instance, has numerrous changes spanning a few years. Many models had none.
Improved engineering designs, avalability of components or new style components, value changes for improved reception/stability, new/better tube changes, etc. caused changes for the most part.
Ron may have more insight as well . . . . .
Improved engineering designs, avalability of components or new style components, value changes for improved reception/stability, new/better tube changes, etc. caused changes for the most part.
Ron may have more insight as well . . . . .
Chuck Schwark,
The Philco Repair Bench
[Image: http://www.philcorepairbench.com/images/philog3tiny.gif]
http://www.philcorepairbench.com
