You're talking about a non-issue on a portable device.

The ones I listed are just ones I found around the budget i have in mind, haven't listened to any of them yet. I'll add the T1 to the list, but I think they are closed types? Thanks for the tip! Same for the MrSpeakers, but I've never seen any store around here carry them.   The amp can handle...

Why are you worried about this on a portable system that is less than ideal to start with? No disrespect intended, but jitter seems to be the new hype.

I've recently picked up the audio bug again after a 12 year hiatus. I (regretful, now in hindsight, which is always 20/20) sold most of my gear so I am starting over from scratch, but this time with head-phones first for practical reasons.   Anyway, to see if I wanted to commit to building my...

Power amps don't have volume controls or a preamp section. Your tube amp is an integrated amp with it's own volume control and enough gain to drive from a small input signal to the output stage. Hence you can just use the fixed output and use the volume on your amplifier.   I've not tested the...

Does anyone have access to the schematics of the DAC1's output section?

  What is the point of that? The USB is not meant as an accessory port, but an input from your PC.