I guess I will just stay with the Loki. Not a hardship as it is a magical combo. 
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Well, the crack is more made for driving headphones rather than a preamp, but that being said, I would expect it to make a positive change as a preamp if you wanted to add a bit of tube into your koss
Iām going to guess that the buzz is an impedance mismatch between the koss and the crack, or perhaps it might be a ground loop somehow, but Iām not good with stuff like this lol. Try isolating the 95x and crack to separate outlets if you can, see if that changes anything
That being said, if you donāt find you have a use for your crack (as in you donāt have anything you can use with it), it should be easy to sell as they are in demand for prebuilt versions
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The koss amp? Hmmm strange, perhaps could it be from your dac?
Also how were you using the crack as a preamp? It doesnāt have any rca outs unless you were to mod them in
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Hmmm interesting. Iāve seen a few people use them as preamps but didnāt know if it was actually encouraged or not lol.
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Tube amps are designed to drive specific loads, I honestly havenāt looked at how the crack output section is designed, but itās quite possible that it will sound radically different driving another amp where the input impedance is probably 50-100K Ohms than it would driving a 300 Ohm headphone
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Then Iāll believe him.
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Makes sense
@RamenFlamen did you just finish the build and are having this issues, or have you had the crack for awhile and it just started happening
Gotcha, well the 600 is an awesome pairing with the crack 
Really??? Thatās interesting and surprising
Well itās still an estat, many high end estat amps are either tube (or hybrid) based
Thatās quite shocking. Just expected that like a planar it wouldnāt be good on tubes
I mean one of my main amps for some planars is now a SET tube amp lol, once you get into the higher end things change.
Also I would assume that working with tubes in an electrostatic amp is somewhat simple because tubes already operate at high voltages, and estats require high voltage so it makes sense? Possibly lol?
Yes Iād imagine it simplifies designs, Valves are basically Voltage amplifiers and Transistors are much better at amplifying current.
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Perhaps I should pick up a higher end solid state estat amp to really get a sense of what that can do lol (since I have only heard them at shows
Iāve listened to very few EStat headphones, Iāve heard some older Stax and that might be it.
For reference what other headphones/amp setups do you usually use? I was very close to pulling the trigger on these, might be a pair for the future.
Let me start by saying that I am not a crier. However, I watched this Tiny Desk Concert the other day with my ESP95X, and I had tears in my eyes (not an all out cry, but still).
So, yeah, these headphones definitely have a quality to them. Iād say that they are very transparent with the environment that the recording was performed in.
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St Paul and the broken bones did a fantastic tiny desk Concert:
Yeah, that one is a shocker. Thatās some soul right there.
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What an unexpected yet fantastic voice!