Ah, right. Not sure I really want to get into building a decoder, wouldn't have 
thought twice back in the 70's, but don't seem to have the time to do anything 
nowadays.

Must be an age thing   LOL

Thanks for your help

Richard
  Hi Richard and Gang

  It is pretty difficult to see the encoding from the oscilloscope
  picture as this is an acoustic SFM organ recording. There haven't been
  any single point sources at any direction in the church, not to mention
  center front.

  If you have a center panned mono signal encoded into UHJ center
  front, it will appear to have that certain phase difference between
  L and R channels. You can see this with multitrack recordings
  that have been mixed "Ambisonically".

  There is a hardware solution to your problem:
  The Wireless World decoder has settings for 45J and Matrix H.
  UHJ didn't exist at that time. You just need to build this decoder.
  The schematics are in the Motherlode:
  
http://decoy.iki.fi/dsound/ambisonic/motherlode/source/Surround%20Sound%20Decoders%20Pts%20567%20WW%201977.pdf

  Please note that the article is missing the AB/MS stage. You need to pay
  attention that this design assumes that M = R + L and S = R - L.

  I once built the WW decoder but I don't have it anymore.

  But if you just wish to hear the surround soundfield, I would say go
  and decode with a UHJ decoder. You wouldn't hear the difference.
  I don't, and I am just a sound designer. :-)

  Peter's suggestion on converting the recording into G-Format is a good
  one. Do that.

  And... as Geoffrey said, don't bother to call Calrec. They'll just get 
  confused.

  It's great that you have found another missing Ambisonic recording.
  It isn't listed in the Ambisonic Discography yet:
  http://members.cox.net/surround/uhjdisc/ambindex.htm

  > On another point, I feel this record need archiving

  Absolutely.

  Funny that there isn't the name of the recording engineer. Usually these
  LP's had.

  Eero
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