Im using the Ei ECC-83 (12AX7) Gray Plates (non Elite, non- gold pins) in my Jolida JD-100. I agree with Newbee's assesment of these as being a tad warmer sounding. The Elite gold pins, I found a bit too bright, and less textured sounding.
Some other members have also posted threads to the same.You may find them in doing a search regarding the Jolida JD-100 and what tubes are being used.
The Elite Gold Pin' are signifigantly more expensive than the ECC-83 Gray Plates...but this does not necessarily translate into better sound and this tube I think really proves it.They are the Cats meow in my Jolida. Warm, yet detailed and resolving with excellent smooth and spacious, well controlled(non spitty) highs, textured mids and excellent bass. I have tried about a dozen 12AX7/5751 types and chose these less expensive gray plates over all.
Be aware that tubes will sound different in different applications of varing components..so use this as a guide and not a definative substitute for your expreience.