Mr. Nelson, why does Pass Labss only offer one class A stereo model?

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(like the old Aleph 5)

No pun intended, but the Aleph designs were economy-class SE power amps.

The XA amps are fully symmetrical designs (with a single-ended twist), which come at an extra voltage loss (dissipation) penalty.
With the same chassis, best you could expect is a little more class A power, at the cost of drastic reduced max output power. Not worth it.
A different chassis with much larger heatsinks translates to a much higher price, also not worth it.
 
Moe29

We put in 5 drops with 12 outlets each for the power amps alone........ as an opening salvo; easily physical space to double that.

The building was originally set up to service big electric kilns. Nelson and Wayne are free to dream as grand as they wish. If they need power, they have but to ask.

Cyclotronguy
 
I think I read somewhere that the idle current is set on the consumer models to not take the heatsinks into the 'instant burn if touched' temperature range for safeties sake. Even my X150.5 at idle dissipating 250w is troublesome to situate and it's actually forcing me to isolate my other gear from it in a proper rack setup (should have done this anyway already but with this amp there's no option but to do it). I can't imagine how hot 100wpc pure class A would get!
 
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