Couple question. Someone told me the ps100 was a stereo power attenuator? I only see one output. Another question, If I want to use this to crank a the tube power section of an amp like a plexi to get a good sound but attenuate it to make it quieter, what affect does your tube power amp part of the attenuator have on it? Like the amp is cranked, then I turn up your freyette and your power tubes are cranked, does it double sag? Also what If I want the sag of your freyette power amp because my amp has a solid state power section and I want to use the fx loop send into your Freyette? Can I achieve natural tube sag with it? Sorry for all the questions. There is a common theme that a CLEAN solid state power section is needed in order to amplify a cranked tube amp, otherwise you are layering cranked tubes which may make the sound too loose.
Hi @matthewearl and welcome to the forum,
Great questions.
No it is a mono 100W power amp 
This is one of the great things about the Power Station concept. Your amp sees a reactive load and your speaker sees an output transformer and a tube power amp. This preserves the interaction between the player, the amp and the speaker. The PS-100 tried not to impose too much character on the sound. So it should still feel like the Plexi experience but at a lower volume.
Yes, as the PS-100 approaches its limits, it will sag and distort too.
People do this with preamps all the time. They run the preamp into the Line In and use the Power Station as a tube power amp, Or they use self-attenuation mode, where the SPKR OUT connects to AMP IN and they take audio from the Line Out. This lets them hear the tube power amp sag and overdrive in silent recording scenarios.
However, we do not recommend using solid-state amps with Power Station.
Yes!