Just picked up a pair of the Telefunken E88CC platinum grade tubes from Upscale Audio. Seemed to be a great deal. I'm looking forward to trying these out in my Lyr with a pair of HD650s.
http://www.upscaleaudio.com/telefunken-e88cc-6922/
At this point, I'll be comparing the Telefunken tubes with:
- 1958 Amperex Bugle Boy (D Getter)
- 1969 Amperex PQ (orange label, shield, gold pin)
- 1978 Voskhod 6N23P (Kaluga factory)
So far, I'm liking the Voskhod tubes the best, but I'll know for sure after the Telefunken tubes arrive. Will post my thoughts later.