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Old 05-05-2012, 04:05 PM   #1
Metal-pro
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My amp stopped working

I have a Randall NBKing 112 (it is a tube amp). Suddenly when I turned on the amp it said "poof" and then it stopped working. What happened? What can I do?

I guess it was a tube which broke?
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Old 05-05-2012, 04:11 PM   #2
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Most likely its one of the tubes that died. Your best bet is to take it to a shop and get it looked at.
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Old 05-05-2012, 04:44 PM   #3
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Checked the fuses? More often than not when you blow a fuse it means you blew a power tube.
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Old 05-05-2012, 05:15 PM   #4
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Alright dudes, thanks for quick response. I'm gonna bring it to the local store for a check.
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Old 05-05-2012, 09:00 PM   #5
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is it powering on at all, or just totally dead?

There should be a fuse on the back of the amp. Pull it out and see if it's obviously burnt. If you have access to a multimeter, check for continuity across the ends. I had one blow on my amp once, and you couldn't tell by looking at it, but the meter read an open.

It could be as simple as a power surge or something fried the fuse, and popping a new one in will have you up and running again. If you replace the fuse and it blows again, stop and take it to a tech. Could be a shorted tube or something. Most tube amps can be repaired pretty easily unless that current spike was able to fry components before the fuse melted. And even then, it'll sometimes be harder to find a dead component than to replace it.
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Old 05-05-2012, 11:03 PM   #6
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i would check the fuse before you take it in...super easy and cheap to replace, it should look burnt up or broken on the inside if it's blown

If it just died out like that I would guess fuse is the culprit

If not, then shop...unless you have money to spend and don't care lol...then shop it for a full re-tube and check up, whenever I get some heavy pockets I usually do this just because...re-tube is depending on my trusted tech's judgement though.
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Old 05-06-2012, 03:05 AM   #7
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There could also be a HT fuse inside the chassis. If it blows the amp will still light up but no high voltage (HT = High Tension) gets applied to the tubes. That's the one that normally blows when a power tube fritzes out.
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Old 05-06-2012, 04:38 AM   #8
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^^ Thanks for answers. And that's right, my amp is totally dead.
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Old 05-06-2012, 01:28 PM   #9
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It was the fuse. Thanks for the help.
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Old 05-06-2012, 01:56 PM   #10
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If it blows again then something is wrong, most probably the power tubes. That accounts for far more blown fuses than power surges.
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