01-18-2008, 04:55 PM
That slight impedance "mis-match" will not affect anything.
I notice you said that the top half of the winding was "open", but your note on the schematic says "0" ohms!! Not the same thing obviously!! Zero ohms is a SHORT, not an OPEN which is infinite ohms...
Just be aware that there may be more corrosion spots waiting to fail in there ....
Use 630's for the electrolytics. You can use non-polarized yellow/mylar/poly types which will fit back inside the can. They do not have to be electrolytics. If you want to use electrolytics, then use 2.2, 3.3, or 4.7uF max to hold down the turn-on current strain on the rect and transformer.
Older constuction and materials in the mid-30s dictated physical sizes then due to being non-polarized wax-paper types many times. Paper and wax have low dielectric constants (hence needing more surface area per microfarad) that does mica, mylar, poly, etc.
I notice you said that the top half of the winding was "open", but your note on the schematic says "0" ohms!! Not the same thing obviously!! Zero ohms is a SHORT, not an OPEN which is infinite ohms...
Just be aware that there may be more corrosion spots waiting to fail in there ....
Use 630's for the electrolytics. You can use non-polarized yellow/mylar/poly types which will fit back inside the can. They do not have to be electrolytics. If you want to use electrolytics, then use 2.2, 3.3, or 4.7uF max to hold down the turn-on current strain on the rect and transformer.
Older constuction and materials in the mid-30s dictated physical sizes then due to being non-polarized wax-paper types many times. Paper and wax have low dielectric constants (hence needing more surface area per microfarad) that does mica, mylar, poly, etc.
Chuck Schwark,
The Philco Repair Bench
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