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  1. I've been quite happy with the performance of my Audio Innovations 300, but an Audio Innovations the First power amp showed up for sale locally and I couldn't resist. This is the 4x ecc88 model, so the gain is unwieldy. I'm temporarily using it with my Chord Mojo, which is able to give a clean signal even at very low volumes. However, I much prefer the glare free treble of my Audio Note Dac 1, or even the Metrum Octave from my headphone rig. The previous owner used a Tisbury preamp for volume control and it seemed like a neat solution. However,AFAIK, the AN DAC likes to see an input impedance of at least 100 kOhm. The Tisbury spec sheet states a 10 kOhm for their preamp. So, my question is this: Is it possible to get, or make, a passive preamp with as much as 100 kOhm input impedance? Or might there be a different solution to this apparent incompatibility of the AN DAC and AI power amp? edit: It appears my DAC has been updated to 1.2 specs, with Cca valves(ecc88/6922) and a resulting reduction in output impedance from 5 kOhm to "just" 1 kOhm. So the Tisbury 10 kOhm input impedance may suffice. However, I suppose 20 kOhm would be preferable. Would anyone know of a passive pre with upwards of 20 kOhm input impedance?