"Millett Hybrid" redux: NuHybrid headphone amp, using the Korg Nutube

  1. HiGHFLYiN9
    Looks great!! Good 'ol Neutrik locking TRS and Alps Blue, can't go wrong with either. Do you have a Greenlee punch for the DIN size stuff? 
  2. Heffa
    I do not, but now after I have googled what it is I wish I had :)
    I usually build my panels using a good old drill, Dremel and small files...
    Last time I built a panel I promised myself to use the 3D printer and print a panel the next time, but naturally my old one is broken at the moment and my new one is still in prototype stage so it's not usable yet.
    Have you used a Greenlee punch? Are they good for aluminium panels and such? No bending of the panel when using it?
  3. HiGHFLYiN9
    I have four of them, one for DIN connectors and the rest for tube sockets. They're exquisitely expensive but worth it if you build a lot. Great for aluminum, steel and copper as long as it's not super thick. It won't bend it. I've heard of people running into problems with diecast metal, but I've personally had no issues. Gives a super clean cut... no need for deburring, etc. 
    Looking forward to see that 3D printed panel when you're back up and running :) 
    As far as my NuHybrid, the parts are coming... I just have to be patient. [​IMG] Trying to decide between a Hammond case and a cigar box for enclosure. 
  4. ericj
    I just cut my panels with an abrasive waterjet system. 
  5. HiGHFLYiN9
    Eric, since it sounds like you have it the easiest, want to cut ours out too? [​IMG] [​IMG]
  6. ericj
    haha that might be doable .  . . . 
    I frequent a makerspace that has a small 2-axis waterjet system. About a 3'x7' cutting area iirc. Costs $55/hr in increments of .01 hour for me to use it. That's only slightly low pricing (an hour of cutting uses $20 worth of abrasive and a lot of electricity) but i also have a key to the shop and can wander in and use it whenever i want. The university charges $1/minute but since i am not a student or even technically a faculty dependent anymore i would have to talk my way in, and they probably wouldn't let me use it at 8pm on a sunday. 
    I am considering cutting faceplates for some amps out of stone tile. I got some really detailed vent work going for my Max.Custom tube protectors are standard hardware + a few minutes in cad + a few minutes cutting + whatever finishing. Waterjet does leave the edges of soft metals kinda rough, and sometimes there is some haze from overspray during piercing. 
    I might be willing to cut out some panels for cost of cutting + donation to the makerspace. we're too disorganized and chaotic to figure out how to charge people dues let alone how much that should be but every now and then we get in commercial waterjet work that pays the bills for a month or two. 
  7. HiGHFLYiN9
    Nice! There are similar places in Baltimore / Catonsville, MD, but nothing with a waterjet system... and they are quite disorganized as well, seems to be par for the course. I'm certain some of the people here would be interested, and a donation to a facility that empowers builders to build is an easy spend in my book.  
  8. JustinDT
    Just finished putting together a NuHybrid and it sounds amazing but I do have an issue.

    It sounds as if the gain is incredibly high, had to switch from my ethers to my DT 770 250 Ohms just to get a listenable level. The only part different from the BOM is the TKD pot. I looked over the solder joints and all look good. Is there anything besides de-soldering and checking each component separately that I can do to troubleshoot?
  9. HiGHFLYiN9
    You're using a 10K pot, correct?
  10. JustinDT
    Yes, it is a 10kOhm pot.
  11. HiGHFLYiN9
    You may have to ask Pete which resistors dictate the gain so you can swap them out.

    Has anyone tried rolling the op-amps yet?
  12. HiGHFLYiN9
    This thread is awfully quiet. Here's an image of my semi-populated PCB:


    Going to put it in a wood box to give that retro table radio feel. FYI you can upgrade the film caps to Polypropylene WIMAs, they'll fit.
    Last edited: May 25, 2017
    hav2uo4 likes this.
  13. NuClear235
    I have my too. I am just start buildind. Still wait for some devices from Mouser...
  14. Heffa
    I just finished my NuHybrid Headphone amp yesterday night.
    It worked fine before I put it in the Hammond enclosure, so hopefully it will still work fine when I get the chance to actually try it out for real tonight :)
    Oh, and the volume knob is only temporary until the right one arrives.
  15. NuClear235
    Bravo. I should do it the same way :frowning2:
    Plastic unshielded box is the shame...
    Heffa likes this.

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