Members thedavidproject Posted January 2, 2008 Members Share Posted January 2, 2008 Hey guys, I was wondering if anyone here knew what the signs of capacitor failure were in an amp. I have a crate vintage club 30 and the clean channel developed a terrible hum and makes a wierd crackle/fuzz noise when I play certain notes. The dirt channel has none of these problems. The amp was retubed about 3 months ago if that helps. Thanks! Link to comment Share on other sites More sharing options...
Members insurrection Posted January 2, 2008 Members Share Posted January 2, 2008 Leaking of any fluids Blackening Swelling (sides and/or top) Bulging (sides and/or top) Or they may look fine and still be bad or in the process of going. Link to comment Share on other sites More sharing options...
Members knucklefux Posted January 2, 2008 Members Share Posted January 2, 2008 prolly a bad tube. Link to comment Share on other sites More sharing options...
Members thedavidproject Posted January 2, 2008 Author Members Share Posted January 2, 2008 I forgot to mention, I did open up the amp and look at them. I didn't notice any swelling or leaking. I guess my question would be if any of the symptoms I described above would be due to the cause of bad caps. If not is there anything else that might cause that problem? Link to comment Share on other sites More sharing options...
Members thedavidproject Posted January 2, 2008 Author Members Share Posted January 2, 2008 prolly a bad tube. I did just replace them though and even if I got a bad tube wouldn't that affect the dirty channel as well? Link to comment Share on other sites More sharing options...
Members insurrection Posted January 2, 2008 Members Share Posted January 2, 2008 I forgot to mention, I did open up the amp and look at them. I didn't notice any swelling or leaking. I guess my question would be if any of the symptoms I described above would be due to the cause of bad caps. If not is there anything else that might cause that problem? Try switching your preamp tubes around, and see if you can't get the problem to leave that specific channel and either effect another channel, or all channels. Link to comment Share on other sites More sharing options...
Members insurrection Posted January 2, 2008 Members Share Posted January 2, 2008 wouldn't that affect the dirty channel as well? I'm not sure about the preamp tube layout on that particular amp, but in most cases, tubes in the gain stage(s) are channel dedicated. Link to comment Share on other sites More sharing options...
Members thedavidproject Posted January 2, 2008 Author Members Share Posted January 2, 2008 ^Ok I'll give that a try tomorrow, according to the schemtaics I found for it you are correct. The tubes are channel separated. I really appreciate your help! Link to comment Share on other sites More sharing options...
Members HKSblade1 Posted January 2, 2008 Members Share Posted January 2, 2008 not caps since they are power supply and common to all channels Link to comment Share on other sites More sharing options...
Members Casey4s Posted January 2, 2008 Members Share Posted January 2, 2008 I did just replace them though and even if I got a bad tube wouldn't that affect the dirty channel as well? Did the problem develop after you installed the new tubes? New production tubes are not as robust as NOS, and you could have a screwed tube. Follow insurrections advice, and if you have another tube handy try it in each slot one at a time. Link to comment Share on other sites More sharing options...
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