Yes 6N13S (6H13C) should be similar to 6080 or 6AS7. LD MK9 uses only one 6SL7 as driver. I have pair of Philips ECG 6080WC USA tubes too.
Since this is little dot thread here is size comparison between DIY monster and LD MK II. (furball on the background is my cat)
Originally i chose MK II since it was very small all tube amp. And look at this, now i have this monster on my desk with 5.2kg transformer. And i know that this DIY amp is still very small in two 6AS7/6080 class and it uses push-pull structure.
I can use 6SN7 to 6AS7 as powertubes and 6SL7 and 6SN7 as drivers. ECC32 should work too as driver, but they are far too expensive. Power consumption of amp is around 88w with 6080's and 6SN7's. So now i can use my precious 6SU7GTY's. With -73 6N13S's i received four -65 6N8S with square getter. So far they sound very good. I think this model should be the best of non-metal base 6N8S's. http://www.ebay.co.uk/itm/251379277920