smurph1 Posted December 20, 2011 Share Posted December 20, 2011 Last summer My Classic 30 developed an annoying hum, that was finally remedied by replacing the A1 pre-amp tube..Now the hum is back..it's only been a few months since I replaced the last tube..Should they burn out that quick? We haven't played a gig since October, and only practiced at very low volumes a couple of times..What Up? Thanks.. Link to comment Share on other sites More sharing options...
mars_hall Posted December 20, 2011 Share Posted December 20, 2011 Not really. there is hum and then there is hum. Can you record it so we have a better idea of which you hearing? Have you did the pencil test again? Is it continuous or intermittent? Link to comment Share on other sites More sharing options...
Hfan Posted December 20, 2011 Share Posted December 20, 2011 Have you tried swapping out the tube? Actually, try reseating them first. Power off of course.If you have no spares, you may have identical tubes in other positions, you could swap positions, see if the problem changes. Tubes, while providing that sweet tone, can be a major PIA. New ones aren't made like the old ones and the quality can be spotty. Link to comment Share on other sites More sharing options...
smurph1 Posted December 20, 2011 Author Share Posted December 20, 2011 Not really. there is hum and then there is hum. Can you record it so we have a better idea of which you hearing? Have you did the pencil test again? Is it continuous or intermittent? It's continuous..I will do that pencil test though, when I get the chance..Thanks..I think I have a spare tube floating around..i'll try that once I can pinpoint the culprit.. Link to comment Share on other sites More sharing options...
DetroitBlues Posted December 20, 2011 Share Posted December 20, 2011 Just because you replaced the tube, doesn't mean it was a good tube to begin with.... You should see the collection of bad tubes KBP has decorating his window sill Link to comment Share on other sites More sharing options...
smurph1 Posted December 20, 2011 Author Share Posted December 20, 2011 Just because you replaced the tube, doesn't mean it was a good tube to begin with.... You should see the collection of bad tubes KBP has decorating his window sill Maybe I should invest in some good ones..Any Suggestions? LOL..I already know the answer to that question.. Link to comment Share on other sites More sharing options...
smurph1 Posted December 20, 2011 Author Share Posted December 20, 2011 Maybe I should invest in some good ones..Any Suggestions? LOL..I already know the answer to that question.. I value your opinions..just know I'm not made of money.. Link to comment Share on other sites More sharing options...
Guest HRB853370 Posted December 20, 2011 Share Posted December 20, 2011 Last summer My Classic 30 developed an annoying hum, that was finally remedied by replacing the A1 pre-amp tube..Now the hum is back..it's only been a few months since I replaced the last tube..Should they burn out that quick? We haven't played a gig since October, and only practiced at very low volumes a couple of times..What Up? Thanks.. This is exactly why I ended up replacing my C30 with the Delta Blues. Recurring humming even after tube changes. It drove me nuts. Finally I said, screw it, and sold the amp on Ebay. They are good amps however, I just didn't have the patience to deal with it. Link to comment Share on other sites More sharing options...
Guest HRB853370 Posted December 20, 2011 Share Posted December 20, 2011 Not really. there is hum and then there is hum. Can you record it so we have a better idea of which you hearing? Have you did the pencil test again? Is it continuous or intermittent? Mark, I always thought the pencil test was for cleavage. Link to comment Share on other sites More sharing options...
smurph1 Posted December 20, 2011 Author Share Posted December 20, 2011 This is exactly why I ended up replacing my C30 with the Delta Blues. Recurring humming even after tube changes. It drove me nuts. Finally I said, screw it, and sold the amp on Ebay. They are good amps however, I just didn't have the patience to deal with it. I LOVE the tube overdrive channel, but i'm getting frustrated too..The reverb is great though.. Link to comment Share on other sites More sharing options...
Guest HRB853370 Posted December 20, 2011 Share Posted December 20, 2011 I LOVE the tube overdrive channel, but i'm getting frustrated too..The reverb is great though.. Yes, and the tremolo on the Delta is sweet! Link to comment Share on other sites More sharing options...
barrymclark Posted December 20, 2011 Share Posted December 20, 2011 Yes, and the tremolo on the Delta is sweet! I only got to mess with one for a moment. I will have to try and make more time with one sometime soon. Link to comment Share on other sites More sharing options...
DetroitBlues Posted December 21, 2011 Share Posted December 21, 2011 Maybe I should invest in some good ones..Any Suggestions? LOL..I already know the answer to that question.. Send a PM to KBP. He'll give you some sound advice on tubes.... Link to comment Share on other sites More sharing options...
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