When did russel/bible students came up with the 606-1914 calculations?
They didn't.
The 606/1914 calculation came entirely from Nelson Barbour, a disappointed follower of William Miller. Russell first came across Barbour's writings in January of 1876. Russell was so impressed with Barbour's work that he paid his expenses to come to Philidelphia and meet with him. Russell then financed the publication of Three Worlds and Harvest of This World which explained Barbour's end-times chronology in detail.
Barbour and Russell worked together for about a year before a disagreement over the mechanics of the Ransom caused them to part company. Russell then commenced publication of a periodical of his own entitled Zion's Watch Tower and Herald of Christ's Presence.
For russel the invisible precense of Jesus started 1874 right?
Yes.
But was'nt his year of autumn 1914 when the harma should start based on pyramydology alone?
The pyramidology came much later and was never anything more than a supporting line of evidence (i.e. Corroboration of the original calculation.)
Also, the modern JW concept of Armageddon came after Russell died. Russell's view was very different.
Russell did believe that 1914 would be the farthest limit of Man's rule though.
Or was he from the start telling about "7 times" and 360 for a year in any of his (er.. marias) books?
The "Tree Dream" (Seven times) has always been the principle calculation