Deang Posted June 19, 2002 Share Posted June 19, 2002 I have some very light 'crackling' coming from my left channel that is only noticable at low volume levels or through the head-phones. It almost sounds like static but isn't. I have isolated it to the preamp. I guess I need to start replacing tubes one by one until I figure out which one it is. Any opinions on what this might mean exactly as far as the tube itself goes? I'm using NOS Amperex White Label 6922 PQ Gold Pins and Amperex 6DJ8 Bugle Boys. ------------------ Deanf>s> Cary AE-25 * S F Line 1 * S9000ES * HSU x-over * SVS CS+ * Klipsch RF7s f>s> Psalm 122:6f>c>s> Quote Link to comment Share on other sites More sharing options...
Klipschguy Posted June 19, 2002 Share Posted June 19, 2002 Dean, Sometimes you can find the offending tube by lightly tapping each tube with a finger tip (don't over do it -it will either work well or not at all). Tube testers sometimes have a hard time checking a "crackly" tube. Sometimes you can switch tubes around to figure it out - if you have a bunch of the SAME tubes on board, i.e. multiple 12AX7's. In your situation, the first thing I would do is switch the left and right preamp tubes to see if the problem switches channels. If it does, you have your answer. Andy This message has been edited by Klipschguy on 06-19-2002 at 12:43 PM Quote Link to comment Share on other sites More sharing options...
mobile homeless Posted June 19, 2002 Share Posted June 19, 2002 Most likely not the tube and more likely dirty contacts. Turn off unit and remove all the tubes and clean the pins and sockets. Could be a tube but more often than not, crackling sounds are dirt in pots, sockets, contacts etc etc. Do this and see what happens before movig to next step. Also, as I remember, you have plenty of backups. Switch tubes as well. The dirty socket/contacts are more than likely the culprit, however. kh ------------------ Phono Linn Sondek LP-12 Valhalla / Linn Basic Plus / Sumiko Blue Point CD Player Rega Planet Preamp Cary Audio SLP-70 w/Phono Modified Amplifier Welborne Labs 2A3 Moondog Monoblocks Cable DIYCable Superlative / Twisted Cross Connect Speaker 1977 Klipsch Cornwall I w/Alnico & Type B Crossover system one online / alternate components / Asylum Listing f>s> Quote Link to comment Share on other sites More sharing options...
NOSValves Posted June 22, 2002 Share Posted June 22, 2002 I agree with Mobile most likely a dirty contact. Pick up some Caig deoxit or even tuner cleaner from Radshack and clean all the tube sockets and retention them and give all the controls and switches a good bath in contact cleaner while turning them vigirously. Good Luck Craig ------------------ HH Scott 299 Amp HH Scott LT-110B Tuner HH Scott P-87 Turn Table JVC JL-F50 Turn Table Sony CDP-CA7ES CD Drive 1985 Walnut Heresey I W/Layne Audio Woofers KSW-15 Subs>c> This message has been edited by NOS440 on 06-22-2002 at 08:04 AM Quote Link to comment Share on other sites More sharing options...
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