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jmartin919

Microwave HV capacitor

9 posts in this topic

I have a GE microwave with a 0.95uF 2100V cap (which is shorted out). Can I substitute a cap of similar value, say 0.98uF. or does it have to be exact? How close does it need to be?

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That will work as long as it mounts in the same location.

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... I have a GE microwave with a 0.95uF 2100V cap 

... Can I substitute a cap of similar value, say 0.98uF. or does it have to be exact?

... How close does it need to be?

usually ±10% is OK

as long as the re-placement Capacitor is equal or higher voltage rating

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Is it preferable to go higher or lower? What would be the difference?

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The higher uF limit is better, but don't go much over the +10%

The Capacitor "smooths out" the pulsing High Voltage DC

and stores a "reserve charge" between the pulses.

A Capacitor with a too high value uF may give the Magnetron too much "initial / peak" power available.

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Thanks. I placed an order for a 1.0uF cap. Will post back with the results.

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I installed it yesterday and it's working great. Didn't have to replace the diode. Setup a voltage test using my car battery and a resistor and it checked out ok. Thanks for your help.

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