I have had the darkvoice since march, still loving it.. Have had no issues, didn't have any hum issues with the stock tubes but I put better ones in anyhow.. This thing will sound as good as you want depending on how much money you are willing to put into the tubes.. I definitely recommend the DarkVoice 335E to any budding audiophile..
Power tube
VINTAGE TUNG SOL 7236 TUBES -BLACK LABEL *METAL BASE* -5998 / 6AS7 / 7236
Output tube
6SN7gtb Tung-Sol (USA) Tube *Black Plates* Very Strong & Balanced NOS
I have used a few, some NOS RCA and few others, these were the best IMO.. And they weren't outrageously expensive..