Sorry, I wasn't sure. To me, the tubes are completely exposed on Cayin HA-300. From the front there is a sort of window frame look into the tubes. I assume that is prevent an accidental touching of the tubes, but more likely it's just for looks.
The HA-300 comes with a set of protection grid, but for demo purpose, we'll remove the grid otherwise the auto-focus of the camera will focused on the grid and the vacuum tubes will be blurred badly.
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