hi...
i need to change a capacitor from ny ups.but original type was not available .eg i need 70 but 71 is available .can i use that ......please some one help me ......what will hapen if i put 100pf instud of 50 pf.

 

You need to change your spelling. You are barely understandable with such misspelling.

 

70 potatoes? Please specify the capacitor a lot better if you want to get any intelligent responses.

 

There is not enough info in your post to provide any advice.
If we had a circuit diagram or knew the function of the capacitor that might help.

 

as a rule increasing the capacitance a little should be ok as long as you dont go too far-it depends on the job the component is doing and if you can keep to the same voltage rating or go a little higher in the case of electrolytics etc-and watch the polarity of components too,make sure all polarized parts are fitted the correct way round ........