As somewhat unfortunate update, I had a good electrician at my house last week for a house issue. He's very experienced and does a lot of soldering thats far more difficult than what I needed help with. I told him about the Crack and (thought) I carefully explained what needed to be done -- told him it should look just like the white connection that's properly connected to the center pin, even showed him the applicable pages of the manual. He said it would be an easy fix and offered to do it for no extra charge (other than the unrelated house work).
Turns out he basically crimped the wire around RCA jack and soldered it to that rather than into the center pin. He admitted it didn't look pretty, but said it will work.
It does seem to work, in fact it sounds great (though I never heard the Crack in previous form so don't have that comparison), but I'm well aware this isn't how it's supposed to be connected. A couple of questions:
(1) What specific problems could this incorrect connection cause? There's no channel imbalance, no distortion, etc. I have no intentions of selling it so not worried about the cosmetics.
(2) I do have to turn to volume up more than I would've expected to fully drive my HD650s-- with 0 volume at 7 O'Clock, I turn it up to ~ 3 O'Clock to get them as loud as I'd possibly want them, again no distortion or any sound issues. Using Jriver (PC vol at 100%) and IfI Micro as DAC, TS 5998 and Telefunk 12a7. Is this normal and if not could it be from the rca connection? Im happy to try different tubes to see if the volume is tube related, but wondering if I should get this fixed properly before really using it
(3) If I do need to have it fixed properly, does this significantly complicate a proper fix? Ill be using someone experienced w/ HP amps and hopefully the Crack if I need to get it fixed right.