Electric recording started in 1925. The Louis Armstrong Hot Five sessions were among the first to benefit from electrical recordings.
About any Sun Ra with Fletcher Henderson recordings, John L. is right. Unfortunately.
The Sun Ra discography by Robert L. Campbell does not include any session with Fletcher Henderson!
I believe electric recording may have begun with the invention of the microphone.
Walter C. Allen's Henderson discography also addresses the issue of Ra w/ Henderson, and states that there are no known recordings.
I bought this when it first came out, and it spun on my turntable many times! I was surprised to find out years later that music was performed opposite of how the LP was programmed, with "If Only We Knew" having been played first.
I bought these as they came out on Pablo LP's, and I'll join the gallery in praising them! It is very fine late period Pres. The rhythm section, while not exceptional, is adequate, and Pres smokes!