Another vote for the =C=(SED St Petersberg plant) that Upscale Audio carrys (http://www.upscaleaudio.com/SED-Winged-C-EL-34_p_63.html). They sounded so nice in my old ST-70(tastefully modded), that when I could no longer find/afford NOS, matched octets of 6550s for my Cary monoblocks; I went to the SED 6550Cs for them as well.
