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Trying to figure the production run on a 620B - Printable Version

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Trying to figure the production run on a 620B - Philco281989 - 12-18-2015

Hey guys,

Getting ready to perform an electrical restoration on a 1935-1936 Philco Model 620B.  I am really having a troubled time trying to figure out the production run number.

The tag is below.  It looks like 1 - 4 but I don't really know what that means.

Thanks for the help.

Jon

RE: Trying to figure the production run on a 620B - Chuck Schwark - 12-18-2015

That's the cabinet tag info, not the Run Number for the chassis.

Chassis production run number should be ink-stamped on top of 
the chassis and is the left-hand number in the rectangle.

Could also be stamped on chassis rear apron.

Chuck

RE: Trying to figure the production run on a 620B - Philco281989 - 12-18-2015

I understand Chuck. Thanks for the correction.

I have looked everywhere on the chassis and am not able to locate the ink stamp. Perhaps it has worn off over the years. A repairman has already been into the set ages ago from what I can tell.

I am just trying to figure out if this chassis is after run number 7 so I can use the correct schematic. From what I can already tell, the newer style three section wire wound resistor is in this set, so most likely it is a run number 7 or later.

RE: Trying to figure the production run on a 620B - Chuck Schwark - 12-18-2015

Well you're in luck.  Service Bulletin 218-A, for the later production runs of the 620, 
beginning with Run No. 7, shows the circuit you have with the 3-section resistor 
in the power supply section.

Happy Holidays!

:-)

RE: Trying to figure the production run on a 620B - Philco281989 - 12-19-2015

Thanks Chuck, I have your literature for this restoration!

Jon

RE: Trying to figure the production run on a 620B - Kenneth F. Besso Jr. - 01-23-2016

   You have to also look at the layout of the Bake-o-lte blocks,,also,,,--it took me a time to figure that all out,,Resistor wire wound bolted to chassis has different Ohms...