Garage1217 (aka G1217) is a well-respected “boutique” type company based in Arizona. I’ve owned four of the amplifiers built by Jeremy Helms (the owner/maker). His co-conspirator is known as Solderdude (Frans), and he’s the technical brains behind the amps.
Here are a few relevant links:
http://www.garage1217.com/ - The commercial site where you can buy stuff!
https://diyaudioheaven.wordpress.com/ - Solderdude’s musings and measurements
http://diyah.boards.net/board/1/amplifiers - Interact with the makers
The Garage1217 Project Ember II is the most well-known of the amps. It’s beloved for near-infinite tube rolling options. That being said, I actually enjoy the sound of the Project Sunrise III and Project Horizon III more myself (these are siblings for slightly different headphone needs).
One of the wonderful enhancements you can make to any of these amplifiers is to provide them either with a linear power supply OR–and this is the cheaper option–build yourself an atomicbob Noise Nuke.
The Noise Nuke is an LC Filter that reduces the ripple and noise caused by the SMPS power supply significantly.
Tons of detail and objective measurements are provided here:
And being DIY-hungry myself, I built one.
Subjectively, everything gets a little cleaner with the Project Sunrise III. If you read up on the previous link, you’ll find a couple more pictures and impressions from me in the thread as well. I highly recommend it if you have a soldering iron, as it’s a really simple project.
I would go on to gush about how enjoyable these amplifiers are for a more-than-reasonable price as well as provide comparisons between some of the top contenders… But, I’ve already done that in a rather long review at Basshead.Club, so I’ll link that instead.
Is anyone else out there familiar with these wonderful little amps? I actually don’t own one right now, but I’m almost certainly going to pick up a Sunrise again once I have the spare change to buy one.