Only problem is, I now have a light scratching static noise coming out of the right channel, even when nothing is attached. So I burned it in two days ago for another 24 hours and boom, no more hum (96 hrs!) ![]() I did a 72 hour burn in and the hum had lessened quite a bit, almost low enough that I can tolerate it. ![]() At first I had the left channel hum I’ve heard so much about (and boy was it loud depending on the headphone). I’ve had my Darkvoice for a little over 3 weeks now and I immediately swapped the stock tubes with a Tung-Sol 6SN7 and an RCA 6AS7G. I’m having some issues that I cannot figure out. Note: Image above features the Northern Electric 6SN7. I realize you can modify the amplifier and add a couple capacitors to solve this but the instructions above will “fix” it for free so give it a try. At the least you’ll notice it’s much quieter and likely only need one more day to get it completely quiet. You should find the hum in the left channel has completely disappeared. Connect your favorite headphones and power the amp on. Power off and re-install the 6AS7/6H13C power tube.ĥ. We find that approximately 72 hours will do.Ĥ. Install your new 6SN7 tube and power the amp on again.ģ. This will keep the unit from over heating during this burn-in procedure.Ģ. ![]() Power off the amp and remove the 6AS7/6H13C power tube. But the good news is that after burn-in they will become dead quiet again. With rare exception, there is a noticeable hum in the left channel. Rather I want to address the common problem folks find when installing their new or NOS 6SN7 tube. We won’t get into which tube sounds best in this article though. It’s most common to upgrade the 6SN7 tube. Unlike some Chinese amps that use obscure tubes with limited or no western equivalents to upgrade to, the DV-336SE uses tubes that have many substitution/upgrade options. Why does such a nice little amp come with such poor tubes? Well most Chinese made amps do come with cheap Chinese tubes because they are readily available. ![]() If you have a Dark Voice 336SE headphone amp you likely had the same thought as many other owners.
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