Kora Cosmos Mono Amps

Hi,
So when I change the tubes I can`t see the red lights ? Another thing ;check the bias ? What does it mean ?
Thank you Jsawhitlock !

Hi,
Yes I understand ! Thank you so much Jsaw ! Another thing ! What`s the different between Kora and the MCintosh Amps ?What is your opinion ? And do you like the MCD-301 SACD Player ? I`m very interested a new cd player I have a Conrad Johnson DF-2 cd player and I`m happy , this is a very musical cd player the highs are smooth as liquid the midrange natural and coherent , but the deep is not so deep I`m not really feel`it

Jsawhitlock , I fix the problem ! I change the fuse and now I can`t see the red lights ! Thank you very much again I appreciate !