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Post by bourgeoisboy (Josh) on Oct 13, 2018 8:56:13 GMT -7
Does Reverb buzz usually mean a bad tube?
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Post by Jaguarguy (Mike) on Oct 13, 2018 9:03:59 GMT -7
Could also be phone interference, lighting issues, power issues or cable issues. Make sure there is no phone anywhere near the amp - I know from experience! Unplug and then replug the reverb cables - sometimes a poorly seated cable can cause buzzing. Also try the amp in another room to see if maybe there is an issue with getting clean power.
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Post by bourgeoisboy (Josh) on Oct 13, 2018 9:21:21 GMT -7
Could also be phone interference, lighting issues, power issues or cable issues. Make sure there is no phone anywhere near the amp - I know from experience! Unplug and then replug the reverb cables - sometimes a poorly seated cable can cause buzzing. Also try the amp in another room to see if maybe there is an issue with getting clean power. Thanks. I just now tried each of those things and still buzz. I think the buzz is actually there with or without the Reverb because when I turn up the master it buzzes too. It’s just more prevalent at lower volumes with the Reverb up... and a different pitch buzz.
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Post by Stephen on Oct 13, 2018 10:28:02 GMT -7
The latest tube recommendations specify a NOS 6201 in V3, the reverb driver, not a current production ECC81/12AT7. Is that what you have?
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Post by nmz on Oct 13, 2018 10:51:20 GMT -7
Could also be phone interference, lighting issues, power issues or cable issues. Make sure there is no phone anywhere near the amp - I know from experience! Unplug and then replug the reverb cables - sometimes a poorly seated cable can cause buzzing. Also try the amp in another room to see if maybe there is an issue with getting clean power. Thanks. I just now tried each of those things and still buzz. I think the buzz is actually there with or without the Reverb because when I turn up the master it buzzes too. It’s just more prevalent at lower volumes with the Reverb up... and a different pitch buzz. [/ With or without the pedal? Could also be the pedal.
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Post by bourgeoisboy (Josh) on Oct 13, 2018 13:50:47 GMT -7
The latest tube recommendations specify a NOS 6201 in V3, the reverb driver, not a current production ECC81/12AT7. Is that what you have? The tubes installed are the ones that came in it 7 months ago when I bought from Humbucker Music. Has something changed or would mine just have the wrong ones installed? I don’t have a NOS 6201...
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Post by bourgeoisboy (Josh) on Oct 13, 2018 14:00:11 GMT -7
Looks like it’s Jan Phillips 12AT7
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Post by bourgeoisboy (Josh) on Oct 13, 2018 14:04:45 GMT -7
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Post by headshrinker (Marc) on Oct 13, 2018 15:27:30 GMT -7
If you have a spare 12AX7 or actually any 12A(anything)7 that you know is good, start subbing it one tube at a time for yours and see if it goes away. It won't matter for testing that the tube isn't an exact replacement for yours. If it doesn't, then you know it's not in the preamp tubes. Also check your power tubes and see if one of them is starting to redplate. If so, that's your problem. Does it do it on half power?
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Post by bourgeoisboy (Josh) on Oct 13, 2018 15:42:16 GMT -7
If you have a spare 12AX7 or actually any 12A(anything)7 that you know is good, start subbing it one tube at a time for yours and see if it goes away. It won't matter for testing that the tube isn't an exact replacement for yours. If it doesn't, then you know it's not in the preamp tubes. Also check your power tubes and see if one of them is starting to redplate. If so, that's your problem. Does it do it on half power? Ok. Thanks. I’ll try that. Yes it does it on 1/2 power.
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Post by headshrinker (Marc) on Oct 13, 2018 16:33:20 GMT -7
Not sure if this will tell you anything because of the way the half power switch works. Try swapping the two outside power tubes with the two inside, (move the first to the second spot, second to first, fourth to third and third to fourth) then put the amp on half power and see if it goes away. If it does then I think it tells you that one of the power tubes is the problem. Which one you wouldn't know, since I'm not sure if the outside or inside tubes are actually driving the amp on half power. If it doesn't go away though, I don't think you can say that it isn't power tubes. Again, because of the way I understand the circuit is designed.
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Post by bourgeoisboy (Josh) on Oct 13, 2018 17:02:45 GMT -7
I swapped all 12ax(t)7s for a spare 12AT7 I had. I unplugged fan I unplugged Reverb I swapped the power tubes the way you described. Still buzzing. The only thing I noticed is one tube has a slight blueish purple glows toward bottom. Not sure if pic will show.
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Post by headshrinker (Marc) on Oct 13, 2018 17:44:33 GMT -7
The bluish glow is fine. As I said I'm not sure the swap of the power tubes ruled out them as a problem, since they are all sort of working when on half power. If one of the power tubes drifted pretty far out of spec compared to the others, you sometimes will get hum from the mismatched power tubes. I'm guessing you don't have a spare set to try? If you have an effects loop, try jumpering it with a shielded cable like a guitar cable. The shorter the better. Also try running a cable in and out a few times of the input jack you don't use if you tend to use just one. If you have some deoxit or something like it spray it on the plug first. Did you try it with a different guitar and cable to rule out that as the problem?
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Post by bourgeoisboy (Josh) on Oct 13, 2018 17:49:36 GMT -7
No, I don’t have a spare set of 6v6s. It buzzes without a cable plugged in. No effects loop. Thanks for all the help.
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Post by headshrinker (Marc) on Oct 13, 2018 18:44:46 GMT -7
You're welcome. Glad to help. If you bought it new, it should still be under warranty. I would first contact Humbucker on Monday and see what they say. If that doesn't help try Don in repairs at 216-475-1962. Likely Humbucker will make it right.
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Post by Stephen on Oct 14, 2018 16:36:23 GMT -7
I know from experience that Don will make it right. I bought a new Maz 18 this summer and something was not right with the reverb. He fixed that and tweaked a few more things too!
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Post by Stephen on Oct 16, 2018 7:30:54 GMT -7
Let us know what happens!
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Post by dhdfoster on Feb 12, 2019 11:31:16 GMT -7
I just received a used Z Lux, and I'm having the opposite problem. Mine hums when the reverb switch is off.
I haven't had a chance to really troubleshoot it, yet, but I'm curious if anyone has seen this problem and may know where to start looking for the issue.
I never turn the reverb off, so it's not a big deal.
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Post by Jaguarguy (Mike) on Feb 12, 2019 12:34:10 GMT -7
I just received a used Z Lux, and I'm having the opposite problem. Mine hums when the reverb switch is off. I haven't had a chance to really troubleshoot it, yet, but I'm curious if anyone has seen this problem and may know where to start looking for the issue. I never turn the reverb off, so it's not a big deal. That's a new one! My suggestion is to check to make sure that all the plugs the cables are clean (deoxit 5 works great) and seated firmly.
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Post by dhdfoster on Feb 13, 2019 10:18:08 GMT -7
I just received a used Z Lux, and I'm having the opposite problem. Mine hums when the reverb switch is off. I haven't had a chance to really troubleshoot it, yet, but I'm curious if anyone has seen this problem and may know where to start looking for the issue. I never turn the reverb off, so it's not a big deal. That's a new one! My suggestion is to check to make sure that all the plugs the cables are clean (deoxit 5 works great) and seated firmly. Thanks for the tip!
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Post by bourgeoisboy (Josh) on Feb 13, 2019 11:37:42 GMT -7
Make sure all of the input connections, control connections (volume, treble, bass, etc) and ground screw connections are tight. This fixed my problem from the original post and is back quiet again. Things evidently loosen in transport.
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