shockthamonkey Posted January 11, 2019 Share Posted January 11, 2019 My tube amp malfunctioned and started making a loud scratching/popping noise. The side of the tube ended up melting. I took that amp out of the chain and began using a solid state sansui. The first time I ran it the right speaker faded out and was scratchy. Then it dropped put completely. How can I trace down the issue? Is it a blown speaker? Quote Link to comment Share on other sites More sharing options...
glens Posted January 12, 2019 Share Posted January 12, 2019 Was it the right channel on the tube amp that failed? First determine whether it's the speaker or the amp. Check your wiring/connections for shorts and swap the speaker wires left/right on the amp to see if it's still the same speaker quiet. Then report back. I'd recommend just a brief (momentary) test, just in case the speaker's causing problems the electronics don't like. Quote Link to comment Share on other sites More sharing options...
shockthamonkey Posted January 12, 2019 Author Share Posted January 12, 2019 Thanks. I tested the speaker with a different amp and that is when the speaker failed. I also tested a different speaker with the new amp and it works fine. So it is definietly the speaker which has problems. Quote Link to comment Share on other sites More sharing options...
glens Posted January 12, 2019 Share Posted January 12, 2019 Well, then, it sounds like it's time to get surgical. Got an ohmmeter? Quote Link to comment Share on other sites More sharing options...
shockthamonkey Posted January 12, 2019 Author Share Posted January 12, 2019 (edited) Yes I have a multimeter Edited January 12, 2019 by shockthamonkey Quote Link to comment Share on other sites More sharing options...
Schu Posted January 12, 2019 Share Posted January 12, 2019 Take the same Sansui and swap leads left to right, see if it persists. Don't swap in another speaker. Quote Link to comment Share on other sites More sharing options...
glens Posted January 12, 2019 Share Posted January 12, 2019 Set the meter to read Ohms. What's the value across the speaker input terminals? (I don't recall whether that model has separate inputs for high and low frequencies, if it does, provide values for both individually) Isolate each driver from the crossover, one at a time, checking the resistance between driver's terminals (through disconnected leads is fine) and check again the resistance at the (appropriate) input terminals, then reconnect the lead and proceed to the next one. Report the values you got for everything at each step. Quote Link to comment Share on other sites More sharing options...
Tony Whitlow Posted January 12, 2019 Share Posted January 12, 2019 Always use a fast blow fuse on your speaker wires.Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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