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Post by fingersmcginty on May 6, 2022 0:46:33 GMT -7
Ever since i got my cure there's been quite a bad hum from it. I suppose it's a job that was always on the back burner. I plugged the amp in the other day and no sound at all but it's not the fuse as the power light is on. Please see pic below might help with troubleshooting. I had a similar issue with my maz18 but one of the power tubes wasn't lit so it was an obvious culprit however from the pic below you can see both 6V6 power tubes are lit.
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Post by fingersmcginty on May 6, 2022 1:02:23 GMT -7
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Post by Chilly Gibbons (Todd T.) on May 6, 2022 1:44:19 GMT -7
Tubes can still fail with heaters that still light up. Loud hum is a pretty good indicator that the power tubes are on the way out. Do you have a spare set of JJ 6v6s you can try?
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Post by fingersmcginty on May 6, 2022 3:33:08 GMT -7
No unfortunately not. Is there a way of testing the tubes with a DVM?
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Post by daddyelmis (Greg) on May 6, 2022 3:50:08 GMT -7
Light and no sound suggests rectifier, and maybe also an output tube. I’d suggest ordering some new tubes and swap them one at a time as that is the easiest, surest way to see if it’s a tube issue. Very easy to just swap out the likely tube culprit to see if that fixes things. You’re going to need them anyway if some other testing reveals a bad tube. I usually keep several spares of each type of tube my amps use. Always good to have spare tubes - it’s like having extra strings.
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Post by fingersmcginty on May 6, 2022 4:33:16 GMT -7
Very valid points. I'll order some. I heard rumblings of different tubes being now used in the cure? Would you have any suggestions? Thanks 😊
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Post by premiumplus (Dave) on May 6, 2022 5:03:21 GMT -7
No unfortunately not. Is there a way of testing the tubes with a DVM? You could check to see if the heater is open, but other than that, no.
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Post by premiumplus (Dave) on May 6, 2022 5:07:30 GMT -7
There is a mod for 5881 tubes, but you need to change the cathode bias resistor to do it, and there are a couple of other changes as well. The amp rocks with 6V6 tubes, and after running 5881s in mine for a while I'm considering going back to 6V6s. Unless you need more power I'd probably leave it as is.
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Post by fingersmcginty on May 6, 2022 5:30:35 GMT -7
Definitely don't need more power I think I'll stick with the 6v6 valves so.
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Post by premiumplus (Dave) on May 6, 2022 5:34:11 GMT -7
Get 'em while you can. The prices are skyrocketing and supplies are low. I just ordered a quad of 5881s and they cost me $221.75 with shipping.
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Post by Jaguarguy (Mike) on May 6, 2022 6:36:54 GMT -7
Here's Doc's video on troubleshooting - definitely worth watching!
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Post by fingersmcginty on May 6, 2022 7:04:02 GMT -7
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Post by purpletele on May 6, 2022 7:47:40 GMT -7
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Post by Chilly Gibbons (Todd T.) on May 6, 2022 11:05:57 GMT -7
I have good luck with TADs thus far, both finding them and their performance.
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Post by fingersmcginty on May 19, 2022 7:06:25 GMT -7
Unfortunately after changing the rectifier and both power tubes i still have no sound at all. The speaker is fine because i ran run a head into it and i get sound. Any ideas? This could be a bit of a headache for me as I'm in Rep of Ireland. Bought the amp brand new from the UK.
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Post by daddyelmis (Greg) on May 19, 2022 8:30:36 GMT -7
Do you have a cab you can plug the amp into (as an external cab)? If an external cabs works, then the issue could be the speaker wire, connectors, etc. Have you checked the speaker connections? Sometimes those wiggle loose or make poor contact. Otherwise, I suppose it could also be a preamp tube and you could try taking a good tube and replacing the others one at a time to see if any of those are bad.
Other than that I’d be looking at warranty service process in Ireland.
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Post by fingersmcginty on May 19, 2022 8:54:03 GMT -7
I connected the speaker from the cure into my orange terror head and I'm getting sound so the speaker is not the culprit. Maybe it's a preamp tube 🤔
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Post by purpletele on May 19, 2022 8:56:56 GMT -7
I connected the speaker from the cure into my orange terror head and I'm getting sound so the speaker is not the culprit. Maybe it's a preamp tube 🤔 Definately, try some new Pre-amp tubes, they allow sound to go through. Sorry that was mentioned previously. 12ax7 at V1-v2 12ax7 Sovtek LPS Try them one at a time to see which one is bad. I bet it's V1 or V3. That should take care of your problem
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Post by Chilly Gibbons (Todd T.) on May 19, 2022 9:05:30 GMT -7
Yep, I’ve had a new amp shipped to me once with the same issue. A preamp tube that looked like the one in the picture above, vacuum compromised.
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Post by fingersmcginty on May 19, 2022 9:11:28 GMT -7
They all look fine. No frosting of the glass at all.
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Post by purpletele on May 19, 2022 9:22:18 GMT -7
They all look fine. No frosting of the glass at all. You can borrow a 12AX7 from your Maz and roll it through the pre-amp section and find your culprit.
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Post by fingersmcginty on May 19, 2022 11:07:45 GMT -7
Ok ... ill try that
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Post by LT on May 19, 2022 11:24:45 GMT -7
If the ideas above don't solve it, contact your retailer and get them involved. Since this has been happening all along, a service call may be covered by your warranty.
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Post by fingersmcginty on May 19, 2022 12:19:47 GMT -7
Thanks so much for all the help lads. I was on to Don in the repair dept and he helped me along with you to diagnose it was V1 that was the culprit. I had a spare ECC83 and now I'm back rockin. Thanks again
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Post by purpletele on May 19, 2022 14:45:04 GMT -7
Thanks so much for all the help lads. I was on to Don in the repair dept and he helped me along with you to diagnose it was V1 that was the culprit. I had a spare ECC83 and now I'm back rockin. Thanks again Sweet, that made my day!
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