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Almarro has poping sound, please help

Recently, my Almarro 318B develop a loud "poop" sound. It is not very frequent. It is intermittent, usually have it after 15 mins or so after it is started. What should I do? I bought the unit used, and I have no history of the unit.
Should I take it to service, or should I try replacing the tube? Is there a way to find out if a tube gone bad? If I am to try replacing the tube, which one should I try first?
gte357s

Showing 1 response by bigshutterbug

bigshutterbug
386 posts
 
Is the sound coming out of both channels or just one side?
If it is just one side, try swapping the left and right output tubes and see if it goes to the other channel. If so, it is a bad output tube. If you don't know how many hours are on the output tubes, the smart bet is to replace them to be safe.
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