Yes Bendix 5852 is just fine ! DS 2 has 6 volt rails, I picked up 2 pairs from Ebay , very inexpensive the seller claims that they are tested on Hickok 6000 tester although one of them turned out to be micro-phonic the rest are good this rectifier "does improve the sound of Pre-amp." which is noticeable.
You should get a quad of CV 181-z , but if you already have 20 matched pairs of WWII era 6SN7 you should try them out
could you list the 6SN7 that you have ? thanks !