I do not know why, but the Lyr is very responsive to the tubes you use in it, hence the giant Lyr tube rolling thread.
All this talk of amplification and the most significant change I have heard in the HE-500s is from changing my DAC from my (much loved) Rega to the Benchmark 2, it really brought out the details more then any tube swapping or amp changing. I was ready to put the Rega up for sale after acquiring the Benchmark, but it warmth is fantastic with the HD800.
I used my hm602 as source through its dedicated un-amped line out....its a mp3 player with a vintage philips non-oversampling dac chip in it..it can also be used as a not so bad mid-fi usb dac...that little gem sounded so good paired with my 337! I didnt use an laptop as source..so no AC noise in my rig..it was battery powered.
As u maybe know..i decided to upgrade all of my rig..so amp AND Dac... As i do know how much a really good dac can do to ur sound.. But its always the sum of all ur components..a good dac with an amp who isnt up to it wont work..as is the other way around..or cabling...i found out that my 337 reacted also very good on upgraded powercables and the way they were connected to the net..in my case..directly into the wall....thats sounds best..i even looked into the phase of the cables thingie..as i found a red dot on the two powerconnectors (shuko euro).. And my ears (or my mind) told me when i aligned the plus (live) side of the wallsocket with the plus (live wire) of the connectors i could hear a little more detail..a eeny weenie bit....as i said..i cant say if that last thing is in my head or not...
Edited by hifimanrookie - 12/6/13 at 11:22pm