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Post subject: Is it common?
Posted: Mon Aug 31, 2009 8:01 pm
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Aspiring Musician
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Is it common to blow fuses if the amps left on too long?
I was in the studio today and had been working for 3-4 hours with my '73 Super Reverb on the entire time. At one point I came back into the main room and found it off. I tried turning it off and back on again but with no luck. Is this something that normally happens?


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Posted: Mon Aug 31, 2009 9:30 pm
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No. Check the rectifier tube then your power tubes. Could just be a bad tube.


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Posted: Tue Sep 01, 2009 3:22 am
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63supro wrote:
No. Check the rectifier tube then your power tubes. Could just be a bad tube.

Hi 63supro,
I'll check that out, thanks for the info! :)


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Posted: Tue Sep 01, 2009 6:40 pm
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Hi pts, Was the amp on standby or just idiling with a guitar plugged in? I agree with Supro about the tube check scenario. Fuses do wear out over time, due to heat and surge stress. I don't know about your location, but my wall outlet voltage is 127AC,on average. Your studio probably has the AC conditioned and regulated, so tihs may have no bearing on the issue. ART


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Posted: Mon Sep 14, 2009 6:20 pm
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Was the amp really hot to the touch? It could be that your output tubes are drawing too much current and blowing the fuse after being on for a long time. To fix this you will need to have the bias adjusted which is similar to the idle on a car. If you do not know how to do this then take it to a tech. It is an easy job. You may need new output tubes however if this has been going on for a while. ROCK!!

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Posted: Mon Sep 14, 2009 6:34 pm
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Hi Billy,

Thanks for the info. It had the original caps in it from '73, that was the problem. I had that changed and had everything else checked out as well. Now it's as good as new and sounds like a dream!

Thanks,
pts295 :D


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Posted: Mon Sep 14, 2009 6:40 pm
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All I can say is AWESOME!! Great news. I'm glad it all worked out. Please feel free to contact me if you have any other questions or anything. I've been a guitar/amp tech for about 25 years and I love helping players out!!

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Posted: Thu Sep 17, 2009 12:37 pm
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63supro wrote:
No. Check the rectifier tube then your power tubes. Could just be a bad tube.


Agreed. Usually a power tube or Rectifier.


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