STAX DMA-X2
- Thread starter rottalpha
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No tear-down yet because they work so well and sounds so good, but making that cap replacement inventory soon.Lurking.
There are some relays that must be replaced but they are not common models, so hunting....
Blue Shadow
Waiting for Vintage Gear from this century
Big class A, these would cost about a grand a year to have them at idle ready to play. More than some replacement tube sets for that kind of amp of way less power. But both have operating cost we can see and feel. Not like those receivers many here like to use.
You miss the part about the Class H power supply / rails.
The power supply in itself is a class AB amp without global feedback. Its job is modulate the power rails at all times, in reference to the output.
Blue Shadow
Waiting for Vintage Gear from this century
Quiescent power consumption is 390 watts vs 430 for a 600 spec Krell. Both per mono amp.
Yes, the heat sinks don’t bristle like pure class A high end amps.
I do need to learn more about those letters past B for amp classes.
Yes, the heat sinks don’t bristle like pure class A high end amps.
I do need to learn more about those letters past B for amp classes.
Some "savings" on the electric bill but still with a fixed Class A bias, no adaptive stepping like the Krell you mentioned. The Stax is always at full bias Class A. The cherry on the cake is that it is a fully balanced design with zero global feedback, which is impressive by any standards considering the power specs. We usually see these features in much smaller amps.
No worries. I was not aware of this either.
Class H has nothing to do with the output stage. The output stage can be A or A/B, with the power supply being class H.
Stax uses something called SDPP (Sustained Differential Push-Pull) Stax's proprietary Class H-derived tracking supply, where the rail voltage follows the signal envelope. This keeps the output transistors operating at a relatively low dissipation regardless of output level.
it has huge heat sinks but to cope with that amount of heat (when pushed) it also uses fans that are super quiet.
That was 2019. In 2019 ¥907,000 was about $8400 and that today would be about $11K, but still a bargain.These STAX monoblocs are my kind of amp and this thread put them on my map
Hifido sold a pair for ¥907,000 (US$5,600), which seems a lot more doable than what folks are asking for stateside.
The catch is: do they need service? If yes, that is a very costly preposition. These are some of the most complex machines I ever looked at.
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Sound Dragon
Yawns and sets his couch on fire!
Loved my time with a pair Stax mono’s just like yours. One of my all time favorite monoblock amplifiers that I truly miss as having around. Great if you can work on them yourself as they do require some maintenance at this point. Enjoy them in excellent health.
AudioAvarice
Super Member
Most of the older Stax gear is multi voltage, it's that true of these too?
I believe ALL Stax gear is multi-voltage. Certainly their amps were.
Making the adjustment requires a technician. Not a turn of a knob.
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thank you King Bubba
