heart wrote:The earliest text that we have on Mahayoga doesn't mention any tsa-lung practices. Neither the Guhyagarbha nor texts like "Dorje sempa zhulan" mention it. On the other hand these are the oldest text we have that mention Dzogchen. However many terma teachings that are called Mahayoga have tsa-lung. So for this reason everyone are quite correct.
I am reading Dalton's Anuyoga dissertation and it is quite interesting as well as easy to read. In anuyoga it seems the inner tantras are always treated together, which makes sense to me. Also it seems that the whole idea of the nine yanas comes from anuyoga, or rather the dupa do. I would really like to see some original anuyoga sadhanas and after reading about early mahayoga I would really like to see those also. That is one problem with scholars, they don't understand practical application.
I'm glad you have mentioned some of these things Magnus, I was thinking of doing so, but I can't recall them as clearly as you do.
It seems that if one is really wanting to look at the original anuyoga sadhanas you should target the Tsog chen dupa`i (Great assembly main empowerment). [Great assembly is the name of fundamental sadhana of the anuyoga root tantra Gongpa dupa, whose elaborate initiation is this Root empowerment to the Nine vehicles]. as mentioned in this list you pointed out http://nyingma-kater.blogspot.com.au/. This is an annual drupchen at many gompas.