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Do you honestly have to change the stock tubes right away? Or are people online just being dramatic?
I would be embarrassed as a manufacturer if my product was only viable with alternate options, so I find it hard to believe they provide sub-par tubes... but I guess I'm still asking about it.
I am not sure about other people, but in my case having experience with DIY, vintage audio and guitar tube gear, the most impact is in the preamp tubes. That being said, with the Darkvoice I received, it was very good out of the box. No need to change any coupling caps, no need to change tubes and no hum or base noise at all. (using AKG K240 55ohm). I just change the stock with a GE 6sn7ge and a NOS Svetlana 6as7 and I perceived it almost same, maybe a little more clarity but that is all subjective. Tube sound is there though, cristal highs and kicking bass. In my opinion, this is a great tube amp for a modest price. Enjoy
You don't need to change tubes at all, unless they burn out. Most people tube roll to get a different sound out of them, for example, they could like a warmer sound so they get a tube that tilts the frequency response to have a bigger mid-bass emphasis, or a bigger soundstage, or more clarity, or a combination of these, can all be done via tube rolling. Some tubes can cost hundreds to thousands due to their popularity and rarity, and wouldn't make business sense to include them with a budget amplifier like the DarkVoice.
You don't need to replace them but it's up to you if you want to. Fair warning, the stock tubes DO need a bit of burn-in time. Burn-in will kill the humming it may or may not come with coming from the pre-tube. Instructions I've seen so far are to have only the pre-tube and power plug in, power-tube not in, and turn it on with nothing connected to it. If you leave it like that long enough it burns in the pre-tube and it will stop producing a hum. This is caused by the pre-tube being new.
Note: Even if you get new tubes for it you can keep the stock tubes and re-use them or put them back in for variety's sake. Different tubes are for different sounds, stock tubes should function just fine as far as the amp is concerned.
My stock tubes sounded great out of the box and had zero hum. I have started tube rolling and have a
SED "Winged-C" 6AS7G (6H13C) and an Electro-Harmonix EH-6SN7. The Electro-Harmonix had massive hum in both channels (more-so in the left) for the first 72 hours...at 84 hours burn-in it is listenable with only a hint of hum. I suspect another 24 hours and it will be completely quiet, as the "getter" will have sucked up all the vacuum contaminants that are causing the hum. I also just ordered a Tung-Sol 6SN7GTB to try as well. As others stated, to burn-in the 6AS7 (the little tube) power off, remove the big 6SN7 tube, then burn-in with ONLY the little 6AS7 tube installed for 72 hours and then power off again, re-install the big 6SN7 tube and give it a listen to see if the hum is gone. If it's gone, you're all done burning it in...if not, continue in 24 hour increments until the hum is gone.
Burning in a Tung-Sol and have a GE and an RCA on the way...will report back after burn-in. It took the Electro-Harmonix 150 hours to lose the hum. There is still a faint amount in the L channel but it is barely perceptible and not a problem now.