consuming ~400-500 watts to deliver a few watts for a headphone? climate warming?!

I had same frustrating hearing experience with it. sound is good at first hear but won't last too much to unplug it

I tested it with HD800 and it sounded good but the music was somehow in rush! it was not relax and comfortable, causing listening fatigue in my case. in one word "not my cup of tea"

you mean you don't notice a noise when you knock on the chassis?! please double check it

no one is constrained to be a good person, being a mere humankind is just adequate nowadays  5 years old Plato from head-fi.org

Audio design engineers also classifiy as "people", that's why most "people" modify audio gears even an Audio Note. everywhere is laden with people. people and more people. what a maze!

I'm in about legs. plugging in headphone just impacts whole the device so hard that tube filament gets noisy and all (or most) of the vibration passes through the tube pins. if it was not about legs, the noise would appear in an intentional hand shaking the amp just like when you shake matchbox...

you'd be better add a small PCB with an optocoupler volume controller (also called light speed attenuator). it comprises some advantegous over regular resistive volume attenuators

that's right. as long as we can't open the tube, the trick is to prevent passing shocks to the tube. we can't stop tsunami but we can be long gone to heights before impact

  for sure it is worthwhile despite that noise. interesting point is that I tested Vali side by side of a Lyr. I'm not telling Vali was a better-sounding gear but it provided a more silent background than Lyr     If I had a Vali (I don't) I would desolder that little tube of the PCB and...

today I gave Vali a listen. the sound to price ratio is stunning but they should conciser a remedy for that little tube microphonic. the instant I plugged in the phone a very annoying hi-freqquency noise was audible and lasted about 30 seconds as if someone slapped me in the ear or like beaming...

seems Schiit designer is so much berried in Norse mythology books! Valhalla is well-known and easier to pronounce but some of their models are just concocted to crack user's jaws. I'm worry they'll some day be in shortage of more Norse myth figures! I can't spell Yggdrasil

thanks man. actually I have Tung-Sol, RCA, Telefunken, Delta and a Russian brand 6080/6AS7 tubes and I've compared all of'em to Delta but none of them is identical to Delta. I have an image of Delta which I used in a project. I appreciate if anyone could help to identify this tube:  

does anyone know the original manufacturer of "Delta 6080" tubes? they are labled "Delta 6080" and "USA". any idea?

we have lots of precision measurement tools in our workshop and we put every tube we got under a sequence of tests. 6SN7* is a nice tube but emits some white noise. it's good for hi fidelity use but not for Hi-end applications IMHO.   * we tested Sylvania Brown base 6SN7 and Raytheon and some...