Infact there's no such thing as tube CD player.
There's no tube circuit that could be designed for digital clock.
The presence of tubes at output of CD player looks like a differential input stage of preamplifier i.e. sort-of extra input stage. It's good to have if you have no preamp and going directly from player to amplifier.
Ah's variable output you can feed directly bypassing HK preamp part if that is possible to reach more transperent sound.
There's no tube circuit that could be designed for digital clock.
The presence of tubes at output of CD player looks like a differential input stage of preamplifier i.e. sort-of extra input stage. It's good to have if you have no preamp and going directly from player to amplifier.
Ah's variable output you can feed directly bypassing HK preamp part if that is possible to reach more transperent sound.