MD same here as HF: Zalgorithm   I'd like to see more amps, not amp/DAC combos, and some stuff from Hifiman/Audeze (if possible) and the Shure 1540.

  Thanks for the reply. It's not that I feel I'm missing a certain synergy (just trying to better define and understand it), but I suppose I'm more curious to what everyone's preferred setup is.   My current amp/source inventory was purchased largely because I got good deals on the Aune T1...

I've been browsing this thread and I too have recently picked up a pair of the K712s. I've have been considering a new amp and I see that people claim that these are somewhat finicky to drive. I currently own an Aune T1 and a JDS Labs O2+ODAC combo.   I don't have a lot of time on these yet...

  Oh I like your magentic flux....

  I have 2 ECC85 tubes and I do not like either of them, although one did sound a little better than the other. At any rate, I too have a Siemens tube which I enoy. I think it's an ECC189.   My girlfriend's father has lots of tubes he's collected over the years from being involved in radio...

I've got the Aune T1 with a pair of he-400's as well and it's been great so far. I've been rolling tubes, but I haven't had as much time as I'd ultimately like to compare them all, but oh well.   At any rate, I've added a little gain just to see how it does and so far so good. I think you'll...

I'm playing around with an Aune T1 and an O2+ODAC combo and I really like the latter. I am currently rolling tubes with T1 at the moment, but I feel the O2+ODAC pairs well with the he-400

I tried them with 0dB and I had the volume cranked and I wasn't impressed so I decided to try and add some gain they are much better at 10dB. I have the pleathers as well, but I don't want to change pads, tubes, and caps simultaneously without understanding what I like and don't like. Yes, the...

I think I'm going to attempt to replace some caps in the very near future. I'll keep everyone posted when I do the swap and see what I find. I'll need to put some more hours on my he-400 and pick a tube a like to have a baseline before I do this.

A higher voltage rated cap can be used in place of the current 50V cap as long as we stay at the same capacitance. Also, they need to physically fit as well.   I think we should, if we have knock off caps, replace them with a Nichicon cap with the 10% tolerance (and same ratings) and see what...

Yeah, I checked mouser and digikey. I tried just googling a 47uF 50V cap and got mostly 20% tol, though I didn't sift through all the results. I didn't find anything with a better tolerance either. I may try a power electronics engineer I've worked with in the past to see if he has an thoughts...

Keep searching arcorob! I'm interested in swapping caps too. If I find some time later, I'll see what I can do, but no promises.    And spacequeen, I think you've made a wise investment in the he-400. Enjoy. HF states a burn in period of 150 hours, just for a fyi.

  While I can't comment on the he-500, I do own the he-400 and I just started rolling tubes. Last night I popped in a 6n23p Voskhod/Siemens tube and so far it sounds great. Plus if you can purchase the he-400 cans at 260 then I'd jump on it. I don't think the T1 will be able to properly power...

I agree with you that the he-400 is maybe overemphasized at frequencies over 14kHz, but I only have a pair of Sennheiser 598 to compare to. Perhaps some would define bright at the high end of the treble spectrum when it can be a bit broader than that.   Thanks for clarifying and I'm just...

I'm not trying to argue, but I thought the he-400 were known to be a brighter headphone while the he-500 was a bit darker. I can't comment on how the D2000 pad mod affects the the he-400, but maybe you can elaborate for me.