@runeight I had some strange behavior with the protection kicking in. On Friday, I had it kick in repeatedly. It kicked in after approximately 45m of listening, and then it happened 3-4 more times. After I noticed it happened, I turned everything off for a while and and still happened.
Then today, I decided that I'd try it out and it hasn't had any issues all day. Same DAC and same headphones. (LHLabs Geek Pulse Infinity balanced out, Ether C headphones balanced)
On Friday, I actually had the volume turned down on the LHLabs, so that the volume on it's headphone output would match the LP. This meant that the volume had to be at 2 o'clock or so, since the DAC was at -34dB output. I started this morning with the DAC at -0dB and the LP at 9 o'clock, then experimented shifting it back to the other way and it didn't have any issues. It's temp is right in the same ballpark temp as it was yesterday too.
Is this just a "glitch" or the tubes burning in and creating some initial DC offset?
Overall, I'm really enjoying it. Though worrying over the weekend that there was an issue wasn't much fun.