Wavelength Brick USB DAC tube rolling?

Although Gordon mentioned that the Brick should not be too sensitive to tube rolling, I did notice a discernable difference between tubes over the past few months I had the Brick.

My Brick came standard with a Ei 12Au7 goldpin, which resulted in a detailed and quick sound that is a little on the lean side. The RCA cleartops I tried are fuller sounding, with a liquid midrange, smooth highs and full bass; detail as well as spatial clues are not quite as well developed (the RCA cleartops were OS and I am not sure how well they measured on a tube tester). The one I ike the most so far is an RFT La Radiotechnique that was tonally somewhere between the Ei and the RCA without sacrificing any detail - well balanced, good timing and dynamics, good spatial detail.

Finally I got some recommendations from other users that I will be trying over the next few months: Mazda trible mica, Amperex, Telefunken, etc.

Also, I have an Opticis USB extension cable on the way to isolate the Brick electrically from the Macbook.

Enjoy the Brick!

Restock,
Thanks for your reply. My used Brick came with a Teonex 6067, Google has little or no info on it. I just put in an Amperex 7316, I'm still evaluating that one. I wanted to try the Mullard CV491 as well, the premium tubes get really pricey. I do have the Opticis cable, I like it very much. Someone had posted about using an alternative battery power supply, I'll have to look into that as well.
I did see a few negative posts about the Brick here, but I like mine. I'm using it with an iMac desktop, far better than the Dell desktop I was using it with. Sounds like you're enjoying your Brick, too!

Check with Gordon, he recommends NOT using a battery supply.

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.