rnros, I have been running my pair of ECC32s for a year and a half with no problems. It seems to handle the higher heater current, no problem. The WA2 sounds so good with this tube. I'm still running it with WE 421As and Marconi U709s also.
Here is the adapter I use:
http://www.ebay.com/itm/like/191186405190?chn=ps&dispItem=1
No need to change tubes or experiment anymore. I wonder what the lifespan is on these tubes. I figure the beginning of 2018 I'll try new pairs as a I have backups for the tubes I'm currently running. NOS Tubes have gotten more expensive the past few years.
Uunfortunately Woo has discontinued the preamp out in their current WA2 production. Perhaps you can find old stock or used that has the preamp output. I was very disappointed in that development. Not a good thing to decrease performance of a product. The preamp out gave the WA2 amazing value. It was one of the main reasons I bought it in the first place. I'm using Beyer T1s as my headphone. Very good symmetry there.