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Maxxedout
17
Dec 17, 2018
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Hi all, I’ve recently taken delivery of my Darkvoice (240V) amp. Was playing for about 1/2hr before it went dead. Discovered the fuse had blown. Replaced a prescribed 1A fuse but it blows immediately when I turn on the power switch. Blowed 4 fuses in succession before I called it quits.
  1. Did I get the 240V model? The label behind is a bit misleading. I’m assuming I got the correct model as it was playing for 1/2hr before the fuse blow.
  2. What could be the likely issue here? I plan to open it up once I get the confirmation of the above question.
Any help would be greatly appreciated. Thanking you in advance. Cheers, Mike.
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Dec 17, 2018
Paraglider
64
Dec 19, 2018
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Get a fan underneath it before you try it again after changing the fuse. This beast gets smoking HOT otherwise!
Dec 19, 2018
Maxxedout
17
Dec 20, 2018
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Yes, I’ve got a ventilation fan for the heat problem. Do you mind taking a pic of the back of your amp along with the voltage version? Thank you.
Dec 20, 2018
Paraglider
64
Dec 20, 2018
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Looks the same as yours. Obviously there is a SS rectifier, no rectifier tube. And no switch for 110/220 like on some computer power supplies. I would think that your tubes heaters would not like 220VAC fed into a PT designed for 110VAC. Your heater voltage would be 12VAC then. So that is how you test it! Take tubes out, replace fuse, turn it on and use your Multimeter to check the voltages on pins 7-8! It may be high 6-7VAC with no load on it but it should not be 12VAC or you got a 110VAC Power Transformer!
Dec 20, 2018
Maxxedout
17
Dec 20, 2018
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Thanks for your reply. I was actually referring to the voltage label (red arrow). Mine’s 50V/60HZ which is pretty misleading.
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Dec 20, 2018
Maxxedout
17
Dec 20, 2018
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And I specified 220V when ordering.
Dec 20, 2018
Paraglider
64
Dec 20, 2018
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I don't work for them I just told you how to test if you have a 110 or 220 version. That printing is the same on them all I suspect! a 110 or 220 sticker goes over that little box before the V. 50 or 60 Hz doesn't matter at all unless you are trying to find PS induced hum. Test as I told you without any tubes. Or, Got a 110 transformer? Use it before blowing anymore fuses at least.
Dec 20, 2018
Maxxedout
17
Dec 21, 2018
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Yeah, I’ll get a 110V transformer and try it out. Thanks! 😊
Dec 21, 2018
Paraglider
64
Dec 21, 2018
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And keep her cool with a fan! You may have killed a tube. Baked to death from too high heater voltage. This is actually the best failure that causes blowing the fuse. Otherwise, you've killed the Power transformer. Let's hope not. See if it blows a fuse without the tubes in. Good sign if the fuse doesn't blow. Now you know 1 of the tubes may be shot. Put the 110 transformer on and install the 6SN7 only to see if that is OK. I suspect the 6080 tube which pulls 2.5A of 6.3VAC to light its heaters may have burned up if you gave it near 12VAC for the heaters.
Dec 21, 2018
Paraglider
64
Dec 21, 2018
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The outside of the box my DV came in was the only place I see mine clearly marked 110V.
Dec 21, 2018
Maxxedout
17
Dec 21, 2018
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The fuse blows without the tubes on, as soon as I turn on the power.
Dec 21, 2018
Paraglider
64
Dec 21, 2018
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Bad news! Transformer smoked! Outside of box? 110V on 1 of the ends? The power transformer is by far the most expensive part on this whole amp! It is a goner! 8^(
Dec 21, 2018
Maxxedout
17
Dec 22, 2018
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My box is clearly labeled as 220V. Dang! Hope it’s not the transformer. Think I’ll just open her up and see what’s inside. Thanks for all your valuable input! 😊
Dec 22, 2018
Paraglider
64
Dec 22, 2018
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When it blew the first time, any magic smoke escape for the insides? You will likely violate any warranty opening it up. Be aware. But if warranty unavailable or uneconomical and you are going in anyway. Look for obvious burned shit but also use your nose to smell around for odd smells. Often one can smell if some thing smoked without opening it up. If it is not the transformer I expect it to be one of the power supply Electrolytic caps blew and shorted. That would be better than the Transformer! ;^)
Dec 22, 2018
Maxxedout
17
Dec 22, 2018
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Can’t recall seeing/smelling any smoke. Was playing well for 1/2 hr and the blue light went off. Sound sort of tail off rather than gone suddenly. Checked and found fuse blown. Replaced fuse but it blows immediately upon turning on power switch. I’m probably not sending it back to China for warranty repairs so I’ll just open it up. 😉
Dec 22, 2018
Paraglider
64
Dec 22, 2018
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You saw the pics of the insides of mine, right. Up where I connected the little transformer is the board with the power supply E-caps on it. Look for those to be bulging or leaking if you can. Then sniff around for anything burnt! ;^)
Dec 22, 2018
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