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Post by tgpbeatnik on Oct 5, 2017 18:01:41 GMT -7
I don’t know if I am imagining stuff but it seems like after a couple hours of running the Cure I get a loss in treble when I turn down the guitar. The guitar is a PRS CE and I am fairly certain that it is wired to maintain the treble response through the range of the volume. And I don’t think I perceive a drop in treble response when the amp is just fired up.
I run the volume at 10, treble at 10, mids at 2, bass at 2, master wide open, and the limit at 10. (All values are numbers on a clock face).
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Post by purpletele on Oct 5, 2017 22:24:22 GMT -7
I don’t know if I am imagining stuff but it seems like after a couple hours of running the Cure I get a loss in treble when I turn down the guitar. The guitar is a PRS CE and I am fairly certain that it is wired to maintain the treble response through the range of the volume. And I don’t think I perceive a drop in treble response when the amp is just fired up. I run the volume at 10, treble at 10, mids at 2, bass at 2, master wide open, and the limit at 10. (All values are numbers on a clock face). That's a new symptom that I have never heard expressed. You should get an equivalent reduction in all frequencies as you turn the volume down. That would be very unique to have some sort of a treble bleed (wrong phrase) but it is possible. Typically a Tone Cap is not going to leak or fail under normal operation. You may have to capture that symptom on video, otherwise it might be classified as normal ear fatigue. It also might be a tube issue but that doesn't sound like you recognize any other reason to suspect a tube. We know the Cure runs hot and you need to make sure to allow enough room for ventilation. Dr. Z spotted an amp to close to a wall in a photo and requested that he give it more room for ventilation. Overheating tubes, not failing tubes, might cause a treble loss among other things. That's my 1 1/2 cent
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Post by John on Oct 6, 2017 5:05:31 GMT -7
Treble loss after a 'couple of hours'??
I don't know what speaker you're using, or how close/far away you are from the speaker. Or if there's a loud drummer pounding away right next to you...
But after 'hours'...it could be ear fatigue.
I'm not saying it couldn't be a tube problem or other....but ear fatigue has my vote.
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Post by mickey on Oct 6, 2017 5:09:13 GMT -7
Treble loss after a 'couple of hours'?? I don't know what speaker you're using, or how close/far away you are from the speaker. Or if there's a loud drummer pounding away right next to you... But after 'hours'...it could be ear fatigue. I'm not saying it couldn't be a tube problem or other....but ear fatigue has my vote. Mine too, I reckon I get ear fatigue after 10 minutes these days!
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Post by tgpbeatnik on Oct 6, 2017 5:22:30 GMT -7
It is just me in a room right now (still getting to know the amp). Ear fatigue crossed my mind and the next time I have time I think I will pull out the old field recorder and capture a few seconds at start up and then when I begin to perceive the treble drop. And then go back and listen later.
The other thing is, I don’t practice at loud volumes and I do a lot of clean picking.
Also in retrospect, maybe treble drop is the wrong term. How about I lose the chime that I associate with the amp. Early in the practice time, I can turn down the volume on the guitar and still hear the chime. Later in the night I have to have the guitar full bore to hear the chime.
Does that help?
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Post by Maddog on Oct 6, 2017 5:33:08 GMT -7
I too was thinking ear fatigue while reading your OP. Commonly, when I crank up an amp, I'll think, "dang, why was I using soooo much treble yesterday?" If it's not yer ears, it's probably a tube.....Good luck, brother!
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Post by digs57 on Oct 6, 2017 6:24:47 GMT -7
This happens when I sit down to listen to audio as well...one day man how could this be any better...next day its not quite right...
Speaker getting brokin in?
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Post by tgpbeatnik on Oct 6, 2017 7:04:21 GMT -7
Great trouble shooting ideas everyone!
I don’t know about the speaker breaking in. I caught the issue Wednesday and Thursday. And I’ve broken in a speaker on another combo amp (went from a little too bright to just right) but it still could be a possibility.
So here’s my frustration; I’m at work and I’m wondering if my issue is operator error (if you listen to my wife, that’s the source of all my issues). And I have to know the truth!
Could someone with a treble bleed mod on their guitar dime the level and master and turn the volume to 10 o’clock and see if you get chime and then turn the level to 10 o’clock and see if the chime goes away as you turn down the volume on the guitar.
Oh the impatience of my McDonalds generation (I have to know now!).
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Post by purpletele on Oct 6, 2017 9:16:09 GMT -7
Oh the impatience of my McDonalds generation (I have to know now!). Ha, I haven't heard that reference before!
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Post by frankie on Oct 6, 2017 11:06:05 GMT -7
Great trouble shooting ideas everyone! I don’t know about the speaker breaking in. I caught the issue Wednesday and Thursday. And I’ve broken in a speaker on another combo amp (went from a little too bright to just right) but it still could be a possibility. So here’s my frustration; I’m at work and I’m wondering if my issue is operator error (if you listen to my wife, that’s the source of all my issues). And I have to know the truth! Could someone with a treble bleed mod on their guitar dime the level and master and turn the volume to 10 o’clock and see if you get chime and then turn the level to 10 o’clock and see if the chime goes away as you turn down the volume on the guitar. Oh the impatience of my McDonalds generation (I have to know now!). As tubes warm up, they begin to compress. The first thing you will notice is loss of highest high and lowest low. I would suggest taking a fan and blowing it against the power tubes and see if you still notice the loss in top end.
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Post by Rhythmark on Oct 6, 2017 11:59:06 GMT -7
I don’t know if I am imagining stuff but it seems like after a couple hours of running the Cure I get a loss in treble when I turn down the guitar. The guitar is a PRS CE and I am fairly certain that it is wired to maintain the treble response through the range of the volume. And I don’t think I perceive a drop in treble response when the amp is just fired up. I run the volume at 10, treble at 10, mids at 2, bass at 2, master wide open, and the limit at 10. (All values are numbers on a clock face). perhaps ear fatigue.. All that loudness wears out our senses!!
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Post by tgpbeatnik on Oct 6, 2017 12:20:01 GMT -7
I would suggest taking a fan and blowing it against the power tubes and see if you still notice the loss in top end. Good idea, I will give that a swim this weekend. Thanks! Beatnik
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Post by tgpbeatnik on Oct 6, 2017 16:06:07 GMT -7
Ok I figured it out.
When you crank the level, it increases the brightness (not a bad thing at all— very pleasant in fact). When you turn the level down or any of the volumes in my limited experience, then it can lose a little top end. Again, not a bad thing.
Thank you all for your help troubleshooting. But it was operator error.
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Post by southmusic70 on Oct 6, 2017 17:16:43 GMT -7
You know what?
All of you guys REALLY help people here.
I certainly wish that I had met all of y’all 53+ years ago (when I started); no kidding, because like many of you, I had to work out a lot of these things by myself.
Good stuff, gentlemen...Very cool!
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Post by premiumplus (Dave) on Oct 8, 2017 15:07:58 GMT -7
You know what? All of you guys REALLY help people here. I certainly wish that I had met all of y’all 53+ years ago (when I started); no kidding, because like many of you, I had to work out a lot of these things by myself. Good stuff, gentlemen...Very cool! Truth! If I had had the resources of this community when I started playing in '67 I would be a lot better musician today. I was self taught, I.E. I learned from an idiot!
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