Wavelength Brick USB DAC tube rolling?


Any Wavelength Brick DAC users out there who've experimented with different tubes? I bought a used one and it came with a non-stock tube (which sounds good), I've been wondering if there are improvements to be had with other premium tubes.
Thanks!
heymikey
Herman, just to clarify, I was referring to an external battery supply for the Opticis cable to replace the inexpensive stock power supply, not for the Brick itself.
Who said something bad about the Brick? It is a wonderful piece...I have one, and I am waiting for my Cosecant-about a month. I love the Brick, haven't tube rolled, heard the same thing from Gordon about it not having a big effect. I would try anyway.

I spoke with Gordon on the Opticis, and he actually scoped it, and said the power supply it comes with is terrible, and adds noise. I quickly returned mine (unopened) upon hearing this from Gordon. He offered to build a linear power supply if I wanted to use the Opticis, but it was cost prohibitive. After weighing all the benefitsa against the ongoing effort, I personally decided it was not worth it. Got the Kimber USB, casedclosed for me. I felt it was smarter to put the $$ into upgrading to the Cosecant-can't wait.

Anyway, the Brick is one heck of a front end, I love it. Can't say enough good about it. I may tube roll after living with the Cosecant for a while.
I need the Opticis cable because my iMac and stereo rig are about 45 feet apart. This is what the Opticis is really for, long USB runs. Didn't want to go wireless, with the potential problems of that. I must say, mine sounds pretty good! I'd love to hear the Cosecant, you don't really see any on the used market.
Thats a very good reason to use it then, your are well researched. I am sure there are benefits too, so kudos to that set up.

Yeah the Cosecants don't pop up much on the used side, although there was one here on Agon, a version 1 I believe. I wanted a V2. Any of Gordon's stuff sound great I am sure.
Thanks for the post Heymikey and Restock. The EI tube in my Brick just died and was searching for recommendations. Quite pleased with the La Radiotechnique you suggested. Thanks!