Older PURE CLASS-A Amplifiers


I am looking at some older Pure Class A amps and am curious as to are they as good as some newer amps like the Pass X150, and which ones are recommended, and have they been compared to each other anywhere? Thanks much for the recommendations.

I am considering the following PURE CLASS A amps:
Threshold T-50
Monarchy Audio SM-100 Monos
Monarchy Audio SM-70
Forte Model 4
tpk123
Did somebody say STAX? I got a DA 300. A littal harsh on dynamic speakers. oh so sweet on ribbons & electrostatics. However I don't have anymore:( Anybody looking for some sweet class A amp?
You can also try Pass labs Aleph series of amps. I used to have an Aleph 5 which was very nice, if your speakers are efficient they are excellent.
A shortlist of the amplifiers you are looking for:

Classe DR-3B or DR-3 VHC (very high current)
Bedini 25/25 under serial number 100 -- these were the real 25's -- not the later and cheaper Japanese version, as John likes to call them.

Levinson ML-2's
Electro Research A75 John Iverson's first real amplifier
Krell KSA-50
Threshold SA-3