Ayon CD5S Tube Replacement


I I have recently purchased the above in excellent condition and very happy with the outstanding performance.
The improvement over all my previous CD players is amazing with drastic improvements to resolution, imaging and superb mid/range with another octave of bass!

This player allows streaming via USB and the results are equally impressive highlighting the performance of an exceptional DAC.

The CD5s came  boxed and with the Ayon User Manual  - that did not provide any useful information regarding tube replacement.  I expect the 6x4 rectifier tubes may need to be refreshed - as I notice after turn on the display pulses for a while but becomes stable after about 15 minutes.  I am not sure how many hours this machine has done so I would prefer to simply change the rectifiers_

Can anyone explain how to remove the top plate of the CD5s  to  enable tubes to be replaced as this is NOT obvious and secondly which brand of tubes work best for the power supply and signal path (6h30)?

128x128warmtone
It has been several months ago so I am not 100 percent certain, but I believe they were Sovtek. They were certainly nothing special (i.e. pricey NOS tubes). Knowing how it sounded with the inexpensive factory tubes, I had no problem going with the EH to replace them. 
@csmgolf  thank you again! Did you use regular EH 6H30Pi, or "selected by vendor" (i.e. matched triodes, low microphonics, etc)?