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Received mine today. I'm trying it out with my Grados and really like the sound but...it has a hum. And it's not a slight hum, it's pretty distracting. It doesn't change if I unplug my source, and I've tried different power outlets. None of my other equipment hums. Any ideas?
It's the tubes and the headphones. The tubes hum naturally, it's distortion from the current. It might go away with burn in, but for sure a tube swap will solve it. Some tubes don't hum at all. These stock tubes are cheap, Chinese made. Not complaining, at least it came with tubes. I noticed on some of my low impedance headphones I have a super faint hum, but with the the higher impedance that are made for amps, there's none.
Grados for sure will have humming, they're low impedance. Don't dare try iems with a tube amp.
I'm going to let it burn in for a few days to see if it changes. I wouldn't mind trying another set of tubes though. What's the consensus on which ones to buy?
Be careful with the burn in. You have to watch it nonstop because it runs hot and some darkvoices actually caught on fire.
For tube rolling: http://www.head-fi.org/t/193214/darkvoice-336-336i-tuberolling-tubes
You've got a lot of reading to do. There's no consensus, you just have to go with what people describe and if it sounds good to you; a plus if people say it has no hum with a nice description.
Even though we have the 336se, I'm sure we can use the same tubes as the 336i and 336.
Personally, I'm sticking with the cheap tubes because I'm poor and the nice tubes run super expensive. $40-100 for a tube. Too rich for my blood. Goodluck!
Welcome! Check out the "dark glass rca" a lot of people on that thread mention it.
What is the impedance on your Grados? Chances are it's low. The dark voice is a seriously powerful little amp and it sounds like it had high output impedance - bad for Grados which are easily powered. Don't use these for your Grados.