mrmoto050
1000+ Head-Fier
Hi guys
I want to give this a plug (kudos to @hakushondaimao for getting me involved with this)
This thread - http://www.head-fi.org/t/764953/worlds-first-portable-hybrid-valve-headphone-amplifier-with-a-footprint-smaller-than-most-cellphones
This KS project - https://www.kickstarter.com/projects/970055861/hybrid-valve-headphone-amplifier
Approx US135.00 (+ freight) gets you one of these
Here's what I do know so far.
Battery life is min 10 hours - and could be as high as 12-14
One of the best builds I've seen (machined aluminium)
Average output (measured ) at the headphone out of 0.265 ohms
Frequency test was run using using a signal generator and measuring the peak to peak output voltage over many different frequencies. The output was dead flat from 60 Hz to 17 kHz not even a millivolt of change. There is a slow fall off under about 50 HZ and also over 17600 Hz.
He also ran run a series of sine waves through the amp and took measurements with an oscilloscope to see how they looked. Clean waveforms all the way from 10Hz up to over 20kHz with no sign at all of any clipping or distortion - just text book looking sine waves.
Pocketable - generates virtually no heat
Unfortunately I only got to play with the initial prototype for a day (see pics below). He's adding a volume pot, and variable gain switching - and then I should get an updated model to review. Over the next day or so I should receive max output measurements under load.
KS has less than 12 days to run. He's currently 63% funded. If you know of anyone interested - can you please pass the word.
@Brooko Me, Me I love tubes.. edit just pledged.
