How to select non-noisy tubes? - EH Scott Radio Enthusiasts2024-03-29T12:47:44Zhttps://ehscott.ning.com/forum/topics/how-to-select-non-noisy-tubes?commentId=3925821%3AComment%3A76471&xg_source=activity&feed=yes&xn_auth=noI agree with Angelo on this..…tag:ehscott.ning.com,2020-03-30:3925821:Comment:763952020-03-30T19:04:36.175ZBrad Winderhttps://ehscott.ning.com/profile/BradWinder
<p>I agree with Angelo on this...first make sure no external interference is introducing noise to your set, through either RF or AC noise. I do this by flicking off circuit breakers in our house, one at a time, while the set is playing. I've located noisy dimmer switches and a faulty outdoor lighting transformer this way.</p>
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<p>You can also try finding a noisy tube simply by giving it a gentle flick, while it's operating in the set. I have located a few this way. I don't recommend this…</p>
<p>I agree with Angelo on this...first make sure no external interference is introducing noise to your set, through either RF or AC noise. I do this by flicking off circuit breakers in our house, one at a time, while the set is playing. I've located noisy dimmer switches and a faulty outdoor lighting transformer this way.</p>
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<p>You can also try finding a noisy tube simply by giving it a gentle flick, while it's operating in the set. I have located a few this way. I don't recommend this on the 20's and early 30's tubes with long, unsupported filaments, though...</p> Hi some of the tube testers l…tag:ehscott.ning.com,2020-03-30:3925821:Comment:763922020-03-30T15:47:02.556ZAngelohttps://ehscott.ning.com/profile/Angelo
<p>Hi some of the tube testers let you test the tube for noise.TV-7tube testers will let you test the tube for noise.Try replacing each tube 1 at a time to see if they noise goes away.Try that with ALL the tubes ..My philharmonic 30 AM i have found RCA and Sylvania tubes work best.Many ways for noise to get in the set i have found some LED lights can add noise ,so to can a Plasma tv and of all things the house power meter out side.Angelo</p>
<p>Hi some of the tube testers let you test the tube for noise.TV-7tube testers will let you test the tube for noise.Try replacing each tube 1 at a time to see if they noise goes away.Try that with ALL the tubes ..My philharmonic 30 AM i have found RCA and Sylvania tubes work best.Many ways for noise to get in the set i have found some LED lights can add noise ,so to can a Plasma tv and of all things the house power meter out side.Angelo</p> You have a stash, so just use…tag:ehscott.ning.com,2020-03-29:3925821:Comment:763002020-03-29T21:25:46.018ZScott Seickelhttps://ehscott.ning.com/profile/ScottSeickel
<p>You have a stash, so just use the substitution method. Don't rule out the audio section so fast, I would check the 6K7 and 6F8 first, then work my way to the front end. Don't rule out another component besides a tube. These FM's aren't as bad as the earlier ones, but still getting them really quiet is a job. </p>
<p>You have a stash, so just use the substitution method. Don't rule out the audio section so fast, I would check the 6K7 and 6F8 first, then work my way to the front end. Don't rule out another component besides a tube. These FM's aren't as bad as the earlier ones, but still getting them really quiet is a job. </p> Most of the cheaper tube test…tag:ehscott.ning.com,2020-03-29:3925821:Comment:764712020-03-29T19:12:38.629Zmike hadleyhttps://ehscott.ning.com/profile/mikehadley
<p>Most of the cheaper tube testers have a provision for an earphone to check for microphony, I have an old RCP tester that has this facility,</p>
<p>really crude, let the tube warm up and give it a gentle flick of the finger, and you can hear how good or bad the tube is, not let me down yet.</p>
<p>or you could test by substitution.</p>
<p>Most of the cheaper tube testers have a provision for an earphone to check for microphony, I have an old RCP tester that has this facility,</p>
<p>really crude, let the tube warm up and give it a gentle flick of the finger, and you can hear how good or bad the tube is, not let me down yet.</p>
<p>or you could test by substitution.</p> Scott recommended Sylvania tu…tag:ehscott.ning.com,2020-03-29:3925821:Comment:762142020-03-29T19:06:40.295ZKent Kinghttps://ehscott.ning.com/profile/KentKing
<p>Scott recommended Sylvania tubes in the late 30s. I have certainly used other brands with good results. </p>
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<p>Kent</p>
<p>Scott recommended Sylvania tubes in the late 30s. I have certainly used other brands with good results. </p>
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<p>Kent</p>