This is a continuation of my earlier efforts starting here where I rolled different tubes (WE396a on adapter, stock 6BZ7, Telefunken 6D78), on the Vali 2 before I did Texas or bust. The same methodology was used as back then to keep things consistent. Volume knob was maxed and output level set to about 0.550Vrms. Gain set to low. Load is 300-ohms. This voltage level is enough to drive HD650s to near 100db SPL. https://www.superbestaudiofriends.o...-2-review-and-measurements.10139/#post-325301 WARNING: Oh, if your religion is dogmatic and based on AmirNADS, then get a JDS Atom, Geshelli, or Schiit IEMagni and go away. (We do not recommend the L30 because of some issues with it exploding headphones and fixes which we do not feel will fix the problem, especially with the ESD prone OPA1612). DO NOT SPEND MORE MONEY THAN $149 and certainly stop here and do not read further. Electroharmonix 6922EH standard (new production, barely used) #1 Telefunken 7DJ8 #1 (vintage) Really good results here, although I would not have minded even if we saw successively lower harmonics at 4kHz, 5kHz, etc. Subjectively, this is often what I mean when I say richer sound. This tube is delicate and clean sounding. This tube is highly sought after and more or less unobtainium. This is the 7V version. Electroharmonix 6922EH Gold Pin (new production, barely used) I always wondered if the Gold Pins were really better than the standard. Good indication from here that they really are! Electroharmonix 6922EH standard (new production, barely used) #2 But then we see a standard EH6922 that looks to be on the same playing field as the Gold Pins? Perhaps the standard is more like a box of chocolates and that the Gold Pins are binned. I don't have any extra Gold Pins to get more data.