GrandNagus50
100+ Head-Fier
What is the make and model of your tube equipment?
The Focal Clear MG is only 55-Ohms, normally OTL tube amplifiers are not the best choice for lower Ohm headphone (impedance issue), but if the tube amp is a hybrid (solid state and tube), than 55-Ohm should work better.
Anyway, do you want the portable DAC/amp to work off the iPhone battery or to come with it's own built in battery?
Rather than start another thread, I will ask for advice re the alternative here, i.e., a dongle-type DAC/amp for my iPhone. I currently use the Dragonfly Red, which I have had for several years now. Is there something better? Is the Cobalt model perceptibly better? Is there something new that has become the preferred dongle-type DAC amp for the iPhone during the last couple of years?