I have just received the RKV II 2 days ago from Meier-Audio. However, it has now developed a hum in both channels. I have tried switching power cords, switching the position of the tubes and switching amplifiers. My Sugden headphone amp placed in the same configuration (same power cord...

I just wanted to take this chance and confirm what many on this forum have already said. That is, there seems to be a real synergy for the Sennheiser HD600 paired w/ Sugden Headmaster. The HD600's seem to come alive with detail but manages to maintain its neutrality thoughout the frequency...

Hi All, I've just purchased a pair of Grado RS-1 headphones along with an RA-1 amp last week and have been using them on and off for about 10-15 Hrs. at the time of writing. My initial reactions to the combo is that they provide excellent detail along with a really marvelous mid-range but...