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Post by cn2667 on Feb 18, 2019 13:08:30 GMT -5
My Nitro just popped a fuse. I heard a loud pop then my amp went quiet. I replaced it and it seems to work fine now. This is a sign of a bigger issue though isnt it? Power tubes going bad or something worse?
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Post by splawndude on Feb 18, 2019 16:47:58 GMT -5
So it wasn't the mains fuse? Which fuse did you replace? Did the whole amp die or just the power tubes/sound?
If it was the latter it could very well be a screen grid resistor or similar. That fuse is there to protect the tubes and the rest of the amp so if that blew - you may have an issue. You could put all new power tubes in and see if it happens again. That's probably what I would do. Running it again on the same tubes would be iffy imo. Did you check to see if all 4 power tubes lit back up after you replaced the fuse?
Is this a KT88 amp and has it been modded at all? Do you happen to know what the bias was last time?
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Post by cn2667 on Feb 18, 2019 17:58:45 GMT -5
its an unmodded EL34. It wasnt the Main Fuse but the high tension fuse. All the power tubes are lit up after switching the fuse.
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Post by cn2667 on Feb 18, 2019 18:02:28 GMT -5
I'm not sure when the last time it was biased.
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Post by splawndude on Feb 18, 2019 21:38:44 GMT -5
To be safe- I would have the amp looked at.
Like I said, an HT fuse blowing usually means something is wonky.
Risking it again would not be advisable as it could be much more catastrophic next time.
If you are good with amps and know how to safely inspect it you could look at the board, resistors and socket for any scaring and the like, but in the end you'll probably need the amp traced out and the wonky part replaced. Hopefully it was just a bad tube.
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Post by cn2667 on Feb 18, 2019 21:51:03 GMT -5
Yeah Im not comfortable working inside it past simple stuff. Im going to try and take it to a tech tomorrow.
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