Chris Bacon wrote:
On 15/05/2021 05:59, jon wrote:

So any help on what's up, and what to do about it?

I had something similar and it turned out to be the magnetron breaking
down under load.

I've got one on order, plus 10 fuses....


The fuses are Slo Blow ? You need to
match the original type, for correct
protection. A regular fuse may blow
too quickly, and blow while the oil-filled
cap is charging up.

Paul