tedc
New Member
Posts: 3
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Post by tedc on Feb 16, 2024 15:49:58 GMT -7
Have had the Z-28 MkII for several months now. It's been to several rehearsals / gigs but has largely sat perched in my garage studio. I noticed after the first month that when I was playing the amp clean that I was hearing a strange sound as the note decayed and faded away that it took on a distorted quality. Seems to be more noticeable with pedals than when I plug straight in. I can post a sound clip if helpful. Curious if anyone has had this issue before / how to solve it?
Thanks in advance for the collective intelligence! Ted
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sanox
New Member
Posts: 36
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Post by sanox on Feb 16, 2024 16:25:13 GMT -7
Reminds me of two possible things. First and most likely is a bad tube. The second is a bad speaker. Both I’ve experienced and both reared their ugly head with a distorted sound upon a notes decay. In both situations the sound got worse over a few hours of playing and both were an easy fix although trouble shooting the tubes took some time.
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Post by John on Feb 16, 2024 18:01:06 GMT -7
Plug straight in and make your assessment. You wouldn't believe how many 'amp problems' turn out to actually be pedalboard problems.
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Post by Chilly Gibbons (Todd T.) on Feb 16, 2024 19:04:43 GMT -7
Yes, John is correct, if an overdrive or distortion pedal’s transistors/opamps are not biased correctly, you will get that distorted decay.
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Post by DRZ on Feb 17, 2024 2:49:17 GMT -7
Ted a sound byte would surely help, though troubleshooting via forum thread is tough . My first inclination as others have said is a bad tube .
Z
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tedc
New Member
Posts: 3
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Post by tedc on Feb 18, 2024 17:38:08 GMT -7
Thanks all! Here is a sound clip - Guitar straight into amp. A better description is that after the initial attack, it’s as a static-y like hiss, fuzz type sound. Amp is dead quiet when there is no signal so it’s not the pickups picking something up. on.soundcloud.com/HxbBatTpgao5MJAZ8Amp settings (o’clock): Volume 10 Treble 9 Bass 9 Master 11
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Post by adam on Feb 18, 2024 20:52:08 GMT -7
It just sounds like a stupid tube to me.
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Post by John on Feb 19, 2024 6:40:50 GMT -7
It just sounds like a stupid tube to me.
I always make sure to spend the extra money for the 'smart' tubes. I read about them on the internet....it must be true.
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Post by doctorice on Feb 19, 2024 7:17:31 GMT -7
Ted,
One thing you might try is to set your guitar on a stand, take a towel or an oven mitt and gently hold onto a tube while you pluck a note. This has helped me identify both malfunctioning tubes, which is the most common culprit, and tube sockets with issues.
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Post by frankie on Feb 19, 2024 11:52:22 GMT -7
Thanks all! Here is a sound clip - Guitar straight into amp. A better description is that after the initial attack, it’s as a static-y like hiss, fuzz type sound. Amp is dead quiet when there is no signal so it’s not the pickups picking something up. on.soundcloud.com/HxbBatTpgao5MJAZ8Amp settings (o’clock): Volume 10 Treble 9 Bass 9 Master 11 doctorice advice is dead on. Towel, oven mitt, and dampen while you loop the offending note. It's 90% of the time a microphonic tube, then the other 9% of the time it's a tube that isn't seated quite well. Re-seating the preamp tubes first, even cleaning/lubricating the pins so they make good connect in the socket will likely solve this. If you narrow it down to a microphonic tube that quiets down when you dampen it with a oven mitt/towel, replace it.
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tedc
New Member
Posts: 3
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Post by tedc on Feb 19, 2024 18:08:56 GMT -7
Appreciate the advice -- will send an update after this next step.
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Post by darwinh on Feb 20, 2024 15:49:58 GMT -7
I had a bad EF86 in mine that started acting up just days after I brought the amp home. Call customer service, sent them a recording, and was sent a new one in a jiffy. As an aside I did discover that having my cell phone sitting close to my amp was causing some very strange noise in the amp.
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