With all due respect, I would have to disagree - K701/2 is so much "less" than its fable hard to drive predecessor. I have found something that does not cost an arm and a leg - appearently a copy of SAC with some improvements : http://www.ebay.com/itm/FB1-GERMAN-VERSION-CLASS-A-HEADPHONE-AMP-BASE-ON-SAC-K1000-MODEL-FOR-AKG-/120997560493?pt=LH_DefaultDomain_0&hash=item1c2c0440ad. Comment enough on the availability/desirability of the K1000 is the fact that as of this writing, the above link is the sole "AKG K 1000" search result on ebay - not even the aftermarket cables offered, let alone K1000 themselves ...
Please note I have extremely good results with Technics SU-C04 integrated amp. HEAVILY MODIFIED !!!! It is 2x30W job, but it is not to be underestimated under any circumstances. I remember the slogan Technics was advertising it in British audio press back in the (1981 ) day :
Nobody is offering you LESS for MORE !
It is a mini/midi format, about 30 cm /12 " largest dimension, but gets frequently demaged in transit, due to the fact it is incredibly heavy for such a minuscule size and people just do not get it it needs extraordinarily good packaging to survive the journey.
In stock form, it will be unbearable and painful to listen with K1000 for anytthing like extended listening. Properly modified - that is another story altogether. It is still a bit too little voltage swing for K1000 for the loudest peaks like piano and percussion, but absolutely sublime for anything that requires a bit more normal volume(s).
When compared to one of the smaller Tim de Paravicini's EAR tube amps, my SU-C04 won - by miles, no contest. On speakers that are satisfied with about 30 W - or K 1000.
At the moment, I am not prepared/interested in becoming a Member of the Trade and offering SU-C04 (and/or other ) modifications. Given enough demand, I might reconsider. I am not prepared to give away the knowledge/experience earned hard over many years as a DIY cookbook for free.