Recorded in a shellac, 10", 78 RPM, with the highest fidelity possible at that time.
This disc (Victor 25634) was recorded in 1937 in Victor's Hollywood studios.
Victor's Hollywood studios were used for film companies just to have the best sound possible.
It was probably recorded live, it is, no tape used, direct to disk, and with the RCA Ribbon Microphones.

BENNY GOODMAN AND HIS ORCHESTRA:

Benny Goodman, cl, dir: Harry James, Ziggy Elman, Gordon Griffin, trumpets / Red Ballard, Murray McEachern, trombones / Hymie Schertzer, George Koenig, alto sax/ Arthur Rollini, Vido Musso, tenor sax / Jess Stacy, piano / Allan Reuss, guitar / Harry Goodman, Double Bass [String Bass] / Gene Krupa drums / Fletcher Henderson, Jimmy Mindy, Mary Lou Williams, arrangers .
Recorded in Hollywood, July 7, 1937.

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Sources:
   • HIGH FIDELITY - Changes - Benny Goodm...  
https://www.discogs.com/Benny-Goodman...
https://www.discogs.com/release/11806...
https://forums.stevehoffman.tv/thread...