I have tried to read everything that I can find about the DV336se and tube rolling. My unit came with a hum in the left channel and has gone silent after about 20 hours, but only with the 6SN7 that came from the factory. The others that I have (Elecro Harmonix, Electro Harmonix gold pin and Tung Sol) still produce a hum in the left channel. Since none of these 3 tubes are NOS I am assuming that this is not a tube problem. I am not equipped (with the skill) to do the fritz mod, so is it safe to assume that the hum will go away eventually ? Should I be running the unit with the humming tubes to get rid of said hum ?
Any advice/help welcome.