How to choose replacement capacitors?
Choosing New Capacitors. Each capacitor has two values: a voltage rating and capacitance value. Both are important. The general rule for replacing capacitors is to use values that are equal to or higher than the originally-specified values.
When to replace capacitors?
A good rule of thumb is to replace electrolytics every five to seven years. Older electrolytics may not explode but still cause squirrelly operation or poor audio response. Shotgun replacement of the electrolytics ensures that everything is fresh. Observe the polarity of the electrolytic capacitors as you replace them.
What are the replacement rules for capacitors?
REPLACEMENT RULES FOR CAPACITORS. The microfarad (strength) rating of a replacement start capacitor must be equal to or no greater than 20% of the original start capacitor. 4. If capacitors are wired in parallel the total capacitance (microfarad rating) is equal to the sum of the individual capacitors.
How can I test my old capacitor for leakiness?
To test old capacitors for leakiness, you need a capacitor checker that applies the correct operating voltage, often over 100 volts. Old capacitor checkers are available cheaply at swap meets and on eBay. Like all vintage equipment, they will need routine service—including capacitor replacement—before they are reliable and accurate.
Can you replace the capacitor on an AC / DC radio?
An “AC/DC” type radio can give you a fatal shock from its chassis when plugged in, even when its power switch is turned off. That’s all it takes! If you can replace one capacitor, you can replace ’em all, so go to it. Replace the remaining paper or molded paper capacitors one by one until you reach the end of your list. Step 3. Record Your Work
Can a microfarad rating be changed on a capacitor?
There is a maximum of +10% tolerance in microfarad rating on replacement start capacitors, but exact run capacitors must be replaced. Voltage rating must always be the same or greater than original capacitor whether it is a start or run capacitor.