The manager (owner?) of Christy's was named Eddie Curran. He recorded a number of sessions at the club. The Bird/Wardell date was first issued on Charlie Parker Records in the early 1960's. Curran also recorded several other jam sessions, some of which were slated to be released on the Zim label sometime in the 1980's, but Zim records ceased operation and never issued them. I believe the recordings were made on paper-backed tape.
I agree that, considering the circumstances, the sound on this session is quite adequate.
WOW thanks jack! I wonder where the other Curran recordings are! Mebbe a treasure trove waiting to be found!!!