07-18-2008, 07:40 PM
Well, Chuck has already explained it very well; not only here, but on his site also. Here's the link:
http://www.philcorepairbench.com/tips/svctip35.htm
For now, I can add that there was sometimes no rhyme or reason to a change in a Code number, or lack thereof.
Model 60 is a prime example.
As explained in detail on my site here:
http://www.philcoradio.com/tech/60evol.htm
For the entire run of Model 60, it remained Code 121 even though it changed a LOT during its nearly three year production run.
And then there is Model 89. Code 121 = AM only. That is clear enough. Code 123 = AM and shortwave (1.5 to 3.2 mc). What isn't so clear is that Model 89 became Code 123 when the "police" band was added (March 1933), 1-1/2 years BEFORE the Type 36 det-osc tube was changed to Type 77 (September 1934).
(edited to clarify timeline)
http://www.philcorepairbench.com/tips/svctip35.htm
For now, I can add that there was sometimes no rhyme or reason to a change in a Code number, or lack thereof.
Model 60 is a prime example.
As explained in detail on my site here:
http://www.philcoradio.com/tech/60evol.htm
For the entire run of Model 60, it remained Code 121 even though it changed a LOT during its nearly three year production run.
And then there is Model 89. Code 121 = AM only. That is clear enough. Code 123 = AM and shortwave (1.5 to 3.2 mc). What isn't so clear is that Model 89 became Code 123 when the "police" band was added (March 1933), 1-1/2 years BEFORE the Type 36 det-osc tube was changed to Type 77 (September 1934).
(edited to clarify timeline)
--
Ron Ramirez
Ferdinand IN
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