Hi Maurizio, your Krell is an excellent device and probably not the weakest link in your system. IMO, the DAC in your Labtek is surpassed by the rest of the system.
You of can course improve on the Krell; FM Acoustics, Symphonic Line Kraft 300, Dartzeel, Soulution... to name a few, will give you better sound --- but at a very steep price (usually over 10000euro used!).
Why not purchase a good external dac instead & use the Labtek as a transport? Then ask a technician if it's worth re-capping the Krell?
Stay safe!
You of can course improve on the Krell; FM Acoustics, Symphonic Line Kraft 300, Dartzeel, Soulution... to name a few, will give you better sound --- but at a very steep price (usually over 10000euro used!).
Why not purchase a good external dac instead & use the Labtek as a transport? Then ask a technician if it's worth re-capping the Krell?
Stay safe!