I've heard mine using a vintage Kenwood receiver speaker connections and there is no difference to my ears between that and the EF5 which is the primary amp I use. I really don't get why people think something that puts out more WPC will sound better. No matter the power available, the headphones can only use so much before they start to distort or get fried. Using some people's logic, a darTZeel monoblock should sound so good you'd have a spontaneous orgasm.
So, you tried your vintage receiver that can probably be bought for $50, "and there is no difference" between it and your $499 EF5 tube amp? Sounds like you unintentionally just made a case for other people's "logic", and found a bargain.
Edited by bhazard - 10/19/13 at 9:44pm