Regarding the hum: I can confirm it does have a low level hum with low Z cans and the gain on high. I didn't notice it yesterday (probably due to my excitement and almost exclusive 650 listening). As you noted, the hum does not change volume up or down. I am guessing it's normal for the amp? Note that I do not hear the hum with the 650's.
I too noticed the relay pop. It happened twice last night, and scared me both times.
Oddly, it didn't happen every time I powered on. Either way, I will no longer be powering up with headphones plugged in. It may be safe, but still...I don't want to risk it.
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Thanks for following up on that. I was worried that my unit had an issue. Glad it's all ok.
Here is a pic of the Vali 2 powered up in a 100% dark room, for reference. Pic was taken with iPhone 6 with no flash engaged.
Very cool!
Knowing next to nothing about tubes, especially when it comes to heater voltages and current, is it safe to say that ALL 6CG7, 6N1P, 6DJ8, ECC88, and 6N23P tubes are good to go? Additionally, I often see tubes listed as E88CC. Are these the same thing as ECC88 and are they safe to use as well?
LOL! I'm glad I wasn't the only one window shopping for tubes before I had it in hand!
To be honest, the stock tube sounds wonderful to my ears, so between that (and my crying wallet), I will be happily listening with it bone stock. No tube upgrade required IMO.