Members Gatelyne Posted December 31, 2005 Members Share Posted December 31, 2005 Seems like I have the worst of luck with electronics:( . The Peavey XXX I just got developed a small hum couple of days ago. One thing I have noticed.. its the same hum that I can hear in the head itself while on standby(Putting my ear down to it). I was checking something yesterday.. I was going to check the preamp tubes. I tapped on the metal where all of the tubes are mounted and got a 'thud' out of the speaker(had the volumes maxed). Then I started tapping the preamp tube covers; The tube tucked behind the tranny picked up the tapping very loudly. So I swaped it out with another tube(in the head in different position, I dont have spares). The the different tube in that same position was the loudest again. It didnt matter how I arranged the tubes that position right behind the tranny made a huge tap sound. Maybe all of the preamp tubes are microphonic? Im thinking that it has to do with tubes being microphonic and picking up the tranny hum. What do y think techs? Link to comment Share on other sites More sharing options...
Members Negative K3 fan Posted December 31, 2005 Members Share Posted December 31, 2005 a little hum inside the amp is no problem, its probably the transformers or something, nothing to worry about i dont think youve got microphonic tubes either. When a tube is microfonic you dont hear a huge tap sound, but a a slowly decaying ringing noise. im not a tech, but i think there's nothign wrong. Link to comment Share on other sites More sharing options...
Members Pepi Posted December 31, 2005 Members Share Posted December 31, 2005 I guess the key word here is "developed". Are you sure you just noticed the hum? Sound like transformer hum which most tube amps have. Mine hums too Link to comment Share on other sites More sharing options...
Members Gatelyne Posted December 31, 2005 Author Members Share Posted December 31, 2005 Originally posted by Pepi I guess the key word here is "developed". Are you sure you just noticed the hum? Sound like transformer hum which most tube amps have. Mine hums too Does your hum come out of your speakers to?Thanks to both of you for replying!! Link to comment Share on other sites More sharing options...
Members Gatelyne Posted December 31, 2005 Author Members Share Posted December 31, 2005 And you may be right. I could have just noticed it. Link to comment Share on other sites More sharing options...
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