Members primeholy Posted October 26, 2007 Members Share Posted October 26, 2007 If you have a preamp tube go bad will your amp go quiet? Link to comment Share on other sites More sharing options...
Members Lorax Posted October 26, 2007 Members Share Posted October 26, 2007 Quite the opposite - it'll squeal..... Power tube go bad = silence or melting sounds with some flame attached depending on how unlucky you are:poke: Link to comment Share on other sites More sharing options...
Members primeholy Posted October 26, 2007 Author Members Share Posted October 26, 2007 Quite the opposite - it'll squeal..... Power tube go bad = silence or melting sounds with some flame attached depending on how unlucky you are:poke: Can a power tube go bad and still glow like normal? Link to comment Share on other sites More sharing options...
Members Soulcrusher_X Posted October 26, 2007 Members Share Posted October 26, 2007 I've had a few JJ ECC803 tubes go bad, and the amp would go silent. Link to comment Share on other sites More sharing options...
Members Lorax Posted October 26, 2007 Members Share Posted October 26, 2007 Just so we are clear - the emoticon meant I was messing around.....Should I have been? Probably not - but I did it anyways.....couldnt resist.... Although I have had a power tube basically melt and kill the sound during a gig - what caused that? Link to comment Share on other sites More sharing options...
Members primeholy Posted October 26, 2007 Author Members Share Posted October 26, 2007 Unless the tube has an open filament it will always glow at the top and bottom of the plate. The tube can be shorted and still light. You guys really need to use your google.com search and learn. I was considering this forum kinda my google search as I understand that there are some knowledgable peeps on here and some like to show their knowledge and some like to :poke: . I am also doing some searching on the internet just I have been at work all day and this was my outlet while I couldnt surf. Thanks for your response. Link to comment Share on other sites More sharing options...
Members greg apocalypse Posted October 26, 2007 Members Share Posted October 26, 2007 Oh really? What happends when your preamp tubehas a bad cathode? A short? An open filament?Squeeling/microphonics is in every tube,it's the amplifier circuit that brings it out,along with speaker vibration.Eventually every tube loosens up. Preamp tubes get weaker everytime you turnyour amp on. The most comon problem wesee is a weak cathode which in turnreduces output and gain. You know your god damn {censored}. You get an award for awesome-ness and knowledge of the tube: This Award is presented to Roccaforte Amps for extreme awesomeness and knowledge of the tube!-Greg there you go. Good post man! Very helpful Link to comment Share on other sites More sharing options...
Members primeholy Posted October 26, 2007 Author Members Share Posted October 26, 2007 I tried searching but couldnt find much on how to test a tube. Is there a way to test a tube with a volts ohms reader thingy(I know very little about electronics) or is there a sure fire way to look at a tube to tell whether or not it is bad? Link to comment Share on other sites More sharing options...
Members primeholy Posted October 26, 2007 Author Members Share Posted October 26, 2007 Yay! I found a guy in my City that works on tube amps! He was telling me he was certified for many different ones cant remember what all he said but mine was one. Told me he could work on my Blue Voodoo with his eyes closed! This may be a jackpot for me! Link to comment Share on other sites More sharing options...
Members tlbonehead Posted October 27, 2007 Members Share Posted October 27, 2007 Quite the opposite - it'll squeal.....Power tube go bad = silence or melting sounds with some flame attached depending on how unlucky you are:poke:A totally dead preamp tube, or even one side, can certainly kill the signal and not allow it to go to the next stage. It will certainly cause an amp to be silent. I had it happen a number of times. Link to comment Share on other sites More sharing options...
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