Since non of you was able to help out on the subject, I decided to try it out.
So now I can give you guys the answer; yes, it does make a difference.
After first listening to the stock input [with pot], then with a direct connection from stock rca's to input-tube, and last [after drilling the two holes and mounting a set of rca's along the bias switch] to the most direct way of getting the inputsignal at the tube.
The idea came from imagine myself to be a inputsignal and looking at the barriers I had to take to get where I want to be.
For those of you who believe in the "less is more" approach this should sound familiar, for others new....but you really should try it out.
I use two of the finest interlnks "Siltech" has to offer and with the inputs right next to the input-tube, the signal only runs through those, plus from rca to tube-connector by means of a 1,5 cm silver strip...and it's there.
I'll try to find the time to create a account for loading pics to, so I can start posting some pics along with the stories.

http://www.flickr.com/photos/66295610@N06/page5/
Hope you can view these too, LMK so I can use this to add pics.
BTW; this mod made the complete soundstage bigger and reveiling background voices, reverbs etc. that I had not heard on some favorite tracks. Final decision to make this mod was after looking at the quality of my silver/gold Siltech interlinks, and then to the quality of the inner wire of the amp.......
My wife heard it right way without looking at the new inputs on the amp, or knowing I made the change. ["what have you done this time?"]
Next is the CCE mod; the EL84's will make way for the SV83's and the caps came in today, curious if it will really make such a improvement.
I'll listen to the new tubes first, and then add the caps.
It's already sounding so good.... I take the small hum for granted, since I really never had such a superb combination of gear. Next time my listening-friends will be here it will simply blow them away.