Yes, I listened to the english mono mixes examples and found out that in the 1978 german dub, all translated dialogue (tractor beam and "close the blast door!") and sound effects matches the english mono mix. This also happened to me while watching the 2004SE for the first time in english, and wondered why many soundeffects changed...

Furthermore, the German dub contains music from John Williams in the trash compactor scene which can not be found anywhere else!!

The German version I own is the 1995 THX Laserdisc which I used for comparison. Romours are that the 1993 "Silverscreen" release contains better audio than the 1995 THX LD.

The most interesting part may be that the mono soundeffects are still present in the German DD5.1 mix from 1997/2004! However, they TOTALLY fucked up the dialogue during this process... (they had to extract it from the stereo source, and the software used to accomplish this cut off most of the "s" sounds, which is the reason why Fox Germany recieved MANY complaints from Star Wars fans, because some scenes sound now ridiculous).