Hi:
I am have a question about the way the polarity is shown in the Riders schematic (Vol.7 page 57) for the two large can capacitors for the Philco Model 37-630. The two caps in question are schematic number 60 and 62 12mfd and 8mfd). Is the polarity as they are illustrated right or should it be reversed from what is shown in the book?? Connecting the caps the way they are shown in Riders is not working and in addition,I was also having a problem with the plates of the rectifier tube glowing. I think that this might be related to wrong polarity with
of one or both of these caps. Thanks

John, regardless how it looks to you on the schematic, the positive of 60 goes to one side of field coil and positive of 62 goes to the other side of field coil. If reversed you'll know it soon enough.
Bill VA

:Hi:
: I am have a question about the way the polarity is shown in the Riders schematic (Vol.7 page 57) for
the two large can capacitors for the Philco Model 37-630. The two caps in question are schematic number 60 and 62 12mfd and 8mfd). Is the polarity as they are illustrated right or should it be reversed from what is shown in the book?? Connecting the caps the way they are shown in Riders is not working and in addition,I was also having a problem with the plates of the rectifier tube glowing. I think that this might be related to wrong polarity with
:of one or both of these caps. Thanks

John, are you sure that you havn't grounded the cans on those caps to chassis? They are not to be grounded to the chassis but insulated from it so the B- used for bias is "floating" above chassis ground.PL

: John, are you sure that you havn't grounded the cans on those caps to chassis? They are not to be grounded to the chassis but insulated from it so the B- used for bias is "floating" above chassis ground.PL

John,

Planigan has a good suggestion about the grounding of the caps. Only one of the electrolytics is grounded, 60 on the schematic. The capacitor, 62 on the schematic, has insulators on the screw stud between the cap can and the chassis. One on top of the chassis and one below the chassis. However, if you added new caps below the chassis (didn't restuff the old cans but kept them in place for cosmetic appearance) be sure to isolate the connections of the new caps from the old cap connections.

Radiodoc

:: John, are you sure that you havn't grounded the cans on those caps to chassis? They are not to be grounded to the chassis but insulated from it so the B- used for bias is "floating" above chassis ground.PL
:
:John,
:
:Planigan has a good suggestion about the grounding of the caps. Only one of the electrolytics is grounded, 60 on the schematic. The capacitor, 62 on the schematic, has insulators on the screw stud between the cap can and the chassis. One on top of the chassis and one below the chassis. However, if you added new caps below the chassis (didn't restuff the old cans but kept them in place for cosmetic appearance) be sure to isolate the connections of the new caps from the old cap connections.
:
:Radiodoc

Hi: Thank you for your reply. Update on this issue is that Philco and Riders illustrated the polarity wrong as noted by BillVA. The positive end of both caps get atached to each respective end of the field coil Not the negative as shown. Also like you mention the 60 is a floating ground not attached to chassis and the 62 is grounded to chassis. There is also another mistake in that the part location number of the large 2 watt 9000 ohm resistor is mistakenly labeled as an antenna trimmer and not a resistor which it is. Somebody back then had a bad day!Did any body at Riders check the material they received from the different companies befor printing?

John
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