with the single 9v version i get 40-50 hours per alkaline, or about half that for a rechargeable nimh.  This version should be very similar as the current draw is pretty much the same, the higher voltage just gives much more headroom and allows the op amp to operate with a higher voltage swing...

finally got the second one of my prototypes I meant to bring to the meetup ready to go. Its a deluxe version of my CMOY amps, has an 18v power supply, two selectable gain settings, a bigger/higher grade capacitor on the power supply and a nice acrylic enclosure instead of a mint tin.  

thanks for the kind words jeff, I'm glad you liked the amp, in addition to the little portable amp that I posted pictures of, next week i'll have in PCBs for a deluxe version of my cmoys that will have 2x9v batteries which will allow quite a few other op amps to be used, additionally the...

I'd love to be able to get feedback from real headphone nuts on some of my prototypes, got a USB DAC in the works as well.

Just got in and built one of my prototypes last night....I was hoping the PCBs would be in so that I could bring them to the meet up but they unfortunately were not.  This is a prototype of my ultra-portable headphone amp, has a USB rechargeable Lithium Ion battery and sounds fantastic for its...

Had a good time at the meet, Unfortunately I didn't get to stay long, got a flat tire on the way there and had to get back to pick up the repaired tire before noon.  Really enjoyed getting to hear everyone's equipment and hope that the few of you who got to listen to the Lucid Labs CMOY's...

http://www.lucidlaboratories.com/headphone-amplifiers I'm bringing a bunch of our cmoys to the meet, fingers crossed I'll have prototypes of other amps ready but they will likely not be there in time

btw, i can do CMOY's with custom gain settings and custom op amp chips if anyone is interested.  Right now I just have opa2134 and OPA2227 in stock though

Very excited, also there will be one other person coming with me

Those 12au7 tubes only have so-so performance when run off low voltage so as a CMOY they will have some distortion. You really need at least 24v to get those sounding decent

Right now I don't have either but am working on an 18v CMOY with switchable gain and a plexi enclosure like the bravo tube amps on eBay. I'm also working on a portable amp that will be very small and feature a USB rechargeable lithium ion battery. I'm hoping I'll have prototypes of those for the...

Right now I don't have either but am working on an 18v CMOY with switchable gain and a plexi enclosure like the bravo tube amps on eBay. I'm also working on a portable amp that will be very small and feature a USB rechargeable lithium ion battery. I'm hoping I'll have prototypes of those for the...

They are stock as of now, but I've been meaning to mod them, they could use it. I'll try and get to that before the meet

I will also have an HRT music streamer II+

I'll be there. I'll bring my sennheiser hd600 and fostex t50rp. Also my company Lucid Labs is based in Lawrence and makes headphone amplifiers so I'll bring our CMOY amps and possibly prototypes of our two new versions of amps that we are working on (if they are in yet, which they may not be but...