@scm I'm glad the tube arrived safely for you and that you are enjoying it. Remember, it was my last one, and a spare, so I wouldn't be surprised if it sounds even better after 100 hours.
The Philips 5R4GYS is a magical tube in any Modwright rectified unit that can take it. In Modwrights, I've used them most recently in my LS-36.5 DM preamp, which I sold off two years ago, along with the SWP 9.0 SE (phono stage I owned prior to PS9.0X) and SWL 9.0 SE preamp (before the LS-36.5 DM). I also used it in the Modwright Transporter, which albeit is over a decade old still sounds equivalent to me than a Lampizator Baltic 3. Dan Wright makes incredible gear for their price points and is one of the priceless people in the audio industry.