Quote:With your amp and tubes, the Wathem 5AR4-WC rectifier tube would provide the superior synergy with your EL84 WC power tubes. That would be the choice I would recommend. The highs and especially the soundstage are excellent with this rectifier.
Second that!
Once you have the rectifier in place and have allowed enough time for the burn in you may consider trying the CryoTone 6SN7-WC in place of the ECC88-WC. In my CSP3-A I have the 5AR4-WC, ECC88-WC outputs and the 6SN7-WC input. Next I'm going to try the 6SN7-WC in the input of my UFO25 when I get it back, it has just been processed at Wathen Audiophile.
A word of caution... an immediate discernible difference may not be to your liking at first. Give it 25 hours especially with the 6SN7-WC. Then try a couple of different adapters. The adapters can make a huge difference as I've discovered.
I hope to have my UFO25 back in a couple of weeks then I'll be in a better position to comment further.