NEWS 20060808: 1971 Recordings, a comparison

Recently a new excellent sounding live recording of a 1971 gig appeared. Presumingly digged up from the Bremen Radio archives
Together with Grant deBruijn and John Shilcock, twingo analyzed and compared this new recording with already existing 1971 recordings.

Details of this new 1971 recording are as follows (as stated in the accompagning text-file):

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Kraftwerk - K4 (Bremen Radio 1971) {SEIDR 026}
Gondel Kino, Bremen, Germany
June 25, 1971
A+ Stereo Soundboard Recording
01. Kraftwerk - [K4 (Bremen Radio, 1971) #01] Heavy Metal Kids (07:54)
02. Kraftwerk - [K4 (Bremen Radio, 1971) #02] K1 (15:39)
03. Kraftwerk - [K4 (Bremen Radio, 1971) #03] K2 (Ruckzuck) (19:20)
04. Kraftwerk - [K4 (Bremen Radio, 1971) #04] K3 (15:19)
05. Kraftwerk - [K4 (Bremen Radio, 1971) #05] K4 (11:30)
Total playing time: 69:42
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The CDR was distributed with the following cover art (front and back).

Most interesting is that the sounds is absolutely perfect and that it's credited to be from a date which was not yet in the known concertlists.

Recordings which already existed from 1971 and were taken into comparison:
#1. credited to 19710711 - Germany St. Ingbert Saar (Bootleg: Krautrock Forms 2 (CD/LP?); Caution (LP))
#2. credited to 19710408 - Germany Hamburg Auditorium Maximum (cassetes and mp3's exist)
#3. credited to 19710612 - Germany Köln Photokina (Köln 12.06.1971 (LP Picture Disc); Live in Köln 12.6.1971 (CD); Bremen (CD); Ruckzuck (LP) )
So that makes 4 in total together with the new one:
#4. credited to 19710625 - Germany Bremen Gondel Kino (Bootleg: K4 (Bremen Radio 1971) (CDR))

Comparing the 4 recordings we came to the following findings:
- From the 4 recordings there are only 2 unique, 3 of them (#2, #3 and #4) are in fact the same, and therefore are from the same source and concert.
- Only the recording #1 credited to St. Ingbert contains a different unique recording (and therefore from another gig).

Resulting there are 2 different recordings, which can be credited to 2 different concert dates:
19710711 - Germany St. Ingbert Saar (Bootlegs: Krautrock Forms 2 (CD/LP?); Caution (LP))
19710625 - Germany Bremen Gondel Kino (Bootlegs: K4 (Bremen Radio 1971) (CDR) ; Köln 12.06.1971 (LP Picture Disc); Live in Köln 12.6.1971 (CD); Bremen (CD); Ruckzuck (LP))
Consequently my concert and bootleg pages will be updated to reflect this conclusion.

This however does not mean:
That the 1971 Hamburg and Köln concerts (to which recordings #2 and #3 were credited earlier) did not happen. Posters and other info indicate that the dates are most likely correct. We only conclude there are no known recordings of these 2 gigs..