4 years later... Its working. But it has really audible high pitched distortion and noise. That's when powered straight from my desktop, or trough my powered USB hub. Dunno if it's coming from the GrubDAC itself or added later on by the v3 amp. Ah well. At least I can shelf this project in...

  You read my signature wrong. I don't have the 1440.

Done! Just waiting on Joneeboi to tell me how to wire the amplifier to the DAC and I can fire this puppy up! I'm crossing my fingers this version actually works.  

Well poop. My phone can't stream audio trough the USB OTG cable. How lame.   So yeah, I'm not coming to the meet as I have no setup to bring.

I'm a sad kitten. =(   I bought the Android cable for my Momentums, but it's not compatible with my Moto G. So I think it's time I upgrade my phone. Any of you have an iPhone or a Samsung Galaxy I could try my remotes with, confirm that they work? The box of the Android cable says it's...

Well that's sad.   I own a Motorola Moto G with Android 5.1   The stock, apple certified cable only allows for play and pause. I cant take call or hang up using the remote, and the microphone does not work. Volume up and down does not work either.   So I bought the RCG M2 cable from...

Ugh, my USB OTG cable was lost in the mail. I just ordered another one. Hopefully it gets here soon enough so I can confirm that I have a setup to bring or not.

  That's great! Thanks!   I'll wait to receive my USB OTG cable and confirm I can use my smartphone as source. Otherwise there's no much reason in me attending.

Wow!!    These scale surprisingly well! Listening to them right now out of my Audio-gd NFB-12 and they SHINE. With electronic music they are by far the best headphone I own. That bass is so perfect.

Is anything in this pile of junk of any interest to you peeps? I would not want to carry all that out of the island through bus transit just to have it sit in a corner in need of love.      I sadly don't have a laptop anymore, so I just ordered a USB OTG cable. I'll try to hook my DAC to my...

I bought a new, larger purse to carry these around with me at all time. I think that speaks for itself.   

Seems reasonable. At least you know where you're going with the design.   I have a bunch of op-amps I got over the years, some sent as free samples and others given by friends to try out. Sadly I never had the chance to try them out as all my gear is using discreet circuitry. I could use one...

Interesting design. Quite simple.   Can you explain why you decided to go from a 3 channel design to a 2 channel one? Isn't it a step backward in accuracy?

  It's simple, and to be done with any tube amp: Only plug the headphones in once the amplifier has warmed up and unplug them before powering it down.

So my scanner proved to be unable to take pictures of PCBs, so I went on and bought a DSLR. Here's what I could do with it. You can download the originals and zoom in all you want.