Manley Chinook

In Dec 2015 I purchased a Manley Chinook SE from Upscale Audio.  The box I received and serial number stated a SE version but it was actually the standard version.  Kevin D. asked if I wanted to return for the SE model and we agreed that he would send me the Philips PCC88 tubes instead.  This weekend when I went to the room for a listening session once I powered up the Chinook a loud hum persisted.  I checked all connections and they were good.  Changed the tubes - still hummed.  Changed the ICs - still hummed.  Moved to another audio setup - still hummed.  But, after being on for about 30 minutes the hum lessened but a scratchy/crackly sound could be heard in the background.  Yesterday I sent it back to Manley for diagnosis.  I estimate there is less than 20 hrs use.  When I bought this unit I did my research and felt that this would be a workhorse with no problems.  Has anyone else experienced this type of phenomena with the Chinook.  I have hooked my VPI TT back up to my onboard phono stage on my McIntosh C2300; as good as the Mc is I miss the Chinook.