Hello,   So it seems there are two players coming on September:     HiFiMAN HM-602 (retail 450$):   http://head-direct.com/products.php?k=hm-602 http://www.head-fi.org/forum/thread/504567/hm-602-portable-music-preorder#post_6814838   D/A Chip: TDA1543 LPF Op-amp: OP275...

Hi, I'm wondering what could be the voltage on the x-fi prelude opamp dip. I'm thinking of changing it with an audio dg dual OPA Moon. It has ±9 V as minimum. Anyone has any idea?

Hello, I know that I can/will void the warranty by changing the opamp on my Head-Direct EF1. But my question is: is it technically possible to install an OPA-Earth or OPA-Moon of audio-dg in this amp? They seem to be driven by 9V - 25V... Is it technically compatible?

anyone shed some light on this tube other that it is a cv4003 12au7 mullard. Year ? 000-403 cv4003 kqdd/k 84-44 631 r4f1 appreciated

Which one is better. Same price range it seems. I'm a basshead with a pair of Beyer 770/80. Which do you prefer?

Hi, To all you experienced headfi-ers. As the title says, I have a pair of DT 770 Pro 80 OHM. I'm planning on getting a Darkvoice 336se. I really like bassy, warm, smooth spatial sound with clear highs. What tubes do you headfi-ers suggest for this combo? I will settle on 100usd max for...

Hello all New to the forum. I'm not an expert in these matters so bear with me.. Anyway here is my dilemma. I have a x-fi prelude with upgraded opamps: Dual OPA627BP I plan to buy beyer dt770/80 or dt770/250 (still unsure about this) Will need an amp to fully enjoy the beyer? I am...