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Adding on the costs of nos tubes, a decent power cord (wrong cord for Aussie supplied btw) and interconnects, the end result justifies the outlay. Smooth, powerful and clean , it works best with my Senn hd600 and Beyer Dt150 (300 ohm and 250 ohm respectively), alright with my Grado's and Audio Technica ad900x (32 ohm, 38 ohm), but no good for Mad Dog Pro where high and low frequency extension is missing. I have no buyers regret whatsoever, but as with most OTL amps, whilst they will power lower impedance headphones, the real sonic joy is found with higher impedance models.
Yea OTL amps generaly don't do there best with low impedance loads
Yes Hr, and the 32ohm spec shouldn't be given much credence by prospective buyers. I would guesstimate 100ohms> for headphone choices with the DV. If you have the means and the right headphones, don't agonise, just join the drop. It's a lovely piece of kit for a moderate outlay.