I recently found an unusual copy of Led Zeppelin II with "MADE IN THE U.S.A. BY TECHNIDISC, INC." at six o'clock on the label. The matrix says "WEA/ LED ZEPPELIN LED ZEPPELIN II Technidisc #318-028-007-M 02/21/88F". This was the first time I'd seen a Technidisc CD, apparently a laser disc manufacturer that had a short run of CD production around 1988. When I ripped it I was surprised to discover that the EAC values did not match the common Diament master: It is not simply level adjusted as you can see. Listening to it, it is obviously based on the same digital source and is extremely similar or the same as the common Diament 80s CD mastering. I am not sure, but when I A/B certain tracks there may be slight differences in the stereo separation and high frequencies but I'm not sure I could consistently pick out either one in a blind A/B/X test. Regardless it sounds great and at least equals the common 1980s CD. The CD TOC has different start and end times from the common 1980s CD. The length of "Ramble On" is 4:36 instead of 4:35 as on my other copies. I searched the forum and found no mention of Led Zeppelin II 1980s pressings with different EAC values. Are there other slightly different masterings out there besides this one? Any ideas why this mastering is different? Barry Diament has posted here that he sent digital tapes of his Led Zeppelin masterings to all the CD pressing plants at the time. To me, he seems to indicate that he would expect all the pressings of that era would be digital clones. Regardless, this has given me the opportunity to enjoy this great album and really appreciate the fantastic work that Barry did back in the 80s on the Zeppelin catalog. Really fine sounding CD.