Has anyone tried a linear power supply with a Weiss 204 or 205?

Yes, I got a nice improvement in sound quality with the linked power supply. BTW, most of these power supply types have an internal trim pot that let's you adjust the voltage anywhere within the specified range.

Ultra-low noise Linear power supply DC 5V/9V/12V/15V/18V/19V

https://www.whatsbestforum.com/threads/plixir-statement-lps-i-bought-this-flagship-grade-lps-just-now.36599/page-3

The user Vangelis on this thread tried a Plixir power supply with the Weiss and seems to be raving about the improvement.

For more modest money, I would highly suggest trying the Farad Super 3 LPS. It was the best of the 5 (all under $1000) LPS I have had inhouse.

@surround4life Yes, usb into the Denafrips Iris. But coaxial into the Weiss 205, not toslink. One possible cause for my preference for the Weiss over the Qutest is its ability to output 7.5v vs. maximum of 3v from the Qutest. Into a Benchmark HPA4 via XLR (Qutest has only RCA out) and then to a Benchmark AHB2 set for lowest gain.

I just purchased a Keces P3 so I'll be able to try the 205 with an LPS soon enough.

Hopefully it gives the unit a little more bass/dynamics as that is one area where I think it could be a little better.   Its overall presentation (minus the dynamics) reminds me a lot of the Bricasti M3 I owned for a short while, lots of detail, but not analytical or overly forwarding/fatiguing.   

Map, yes the 204/205 prices jumped significantly over the summer.  In the $2K range I'm really happy with the 205.   I just sold a Meitner MA3 which has been my long term reference.   I don't think the 205 is better, but it is good enough that I think I can live with it for a while...   I'm feeding it with a Bricasti M5.  

yes, Plixir w Weiss 204....beautiful