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Have been using my 336SE from the last drop and it sounds great. My only complaint is that mine has far too much gain on the volume control, even with low efficiency cans I can never get past 9 0'clock (1/4th volume) on the control without it being too loud. It is about the same with both the stock tubes and with some aftermarkets I have tried.
Did I just get a super powerful one, or is this typical. I would like to use more of the control to make volume selection easier.
I think its typical they are super powerful try T50RPmk3s and report back those are some of the hardest to drive good sounding headphones but also the jack of all trades of every genre of music a true swiss army knife. Low impedance orthodynamic planar headphones are supposed to be the hardest to drive with an OTL tube amp I dont know if those are the ultimate challenge for that amp on the market but it should be close to that end. Too much power as long as its clean is never a bad thing. Just remember amps do not have volume knobs they have power knobs and for each speaker or headphone you use with one is going to be different so you should always be in the habit of being careful anyway. In the old days, and some amps still have these problems, you could get feedback that would cause the woofers to max out till they broke so really to be safe if you plan on buying and trying allot of gear, especially if its new to you or you haven't done any reading on it, you should be careful with the knob and be watching the speaker woofer cone and or monitoring your headphones and be careful. Some amps if your not watching your speaker cones(grills off) you wont even hear the feedback distortion it might just over heat and burn out your speakers or tear the cone and if the feedback wave is slow enough you wont even hear it. You can only see the cone maxing out at peak excursion in silent waves.
I am using mine to drive Beyer 600 ohm cans and have the same issue of not turning the volume above 9-10 o'clock. OTL design produces full frequency output throughout the power draw so it's not a problem. In fact I always start with the volume turned to off position because I switch through 3 differing cans that have different efficiencies and loads.
With the DarkVoice run my DT990 600ohms well or does it need something more powerful?