What is the output impedance (not the headphone impedance range, which is what seems to be erroneously listed as the impedance of the amp itself in the specs)
I'm using a Topping DX3 Pro and it sound great. The DX3 is neutral bordering on bright, and the DV balances it with just the right amount of warmth and that tubey sound. Plus the DX3 has a RCA out so you can connect it directly to the DV.
Can this amp be used as a daily driver and left on for 16 hours a day? Or is it really just designed for a specific listening session? Sorry I'm new to tube amps... I know you'll burn up tubes quicker this way but are there any other problems to be concerned with?
I’d imagine it might over heat at 16 hours as this amp gets pretty damn hot after 1 hour of use. I have gone as long as 5 hours with no adverse effects. If you plan to burn in a driver tube, I’d suggest removing the power tube so the unit can stay cool.
If you don't mind using your phone's internal DAC, you can just connect the phone directly to the amp using a 3.5mm-to-RCA cable. But the volume might be lower compared to using a standalone DAC / preamp with better output.