Victor matrix XL-81. Frequency record : 433 and 1,000 cycles when play at 33 1/3 rpm ; 1,000 and 2,300 cycles when played at 78-rpm / Victor Records technical staff (unidentified)
| Title | Source |
|---|---|
| Frequency record : 433 and 1,000 cycles when play at 33 1/3 rpm ; 1,000 and 2,300 cycles when played at 78-rpm (Primary title) | Disc label |
| Personnel | Notes |
| Victor Records technical staff (unidentified) (other) | |
| Mr. Barton (recording engineer) |
- Description: Technical purpose record
- Category: Test/technical
- Master Size: 12-in.
| Notes |
|---|
| Victor ledgers: "This record plays inside out." |
| Victor catalog: "Contains variable frequencies beginning at 10,000 cycles on the outside and ending at 30 cycles. |
| Source(s): Victor blue history card; trade catalog; disc. |
| Take Date and Place | Take | Status | Label Name/Number | Note |
|---|---|---|---|---|
| before 4/1935 New York, New York. Bell Laboratory [unconfirmed] | [1] | Master | Victor 84522 |
Citation
Discography of American Historical Recordings, s.v. "Victor matrix XL-81. Frequency record : 433 and 1,000 cycles when play at 33 1/3 rpm ; 1,000 and 2,300 cycles when played at 78-rpm / Victor Records technical staff (unidentified)," accessed January 9, 2026, http://adp.library.ucsb.edu/index.php/matrix/detail/2000374880/XL-81-Frequency_record_433_and_1000_cycles_when_play_at_33_13_rpm_1000_and_2300_cycles_when_played_at_78-rpm.
Victor matrix XL-81. Frequency record : 433 and 1,000 cycles when play at 33 1/3 rpm ; 1,000 and 2,300 cycles when played at 78-rpm / Victor Records technical staff (unidentified). (2026). In Discography of American Historical Recordings. Retrieved January 9, 2026, from http://adp.library.ucsb.edu/index.php/matrix/detail/2000374880/XL-81-Frequency_record_433_and_1000_cycles_when_play_at_33_13_rpm_1000_and_2300_cycles_when_played_at_78-rpm.
"Victor matrix XL-81. Frequency record : 433 and 1,000 cycles when play at 33 1/3 rpm ; 1,000 and 2,300 cycles when played at 78-rpm / Victor Records technical staff (unidentified)." Discography of American Historical Recordings. UC Santa Barbara Library, 2026. Web. 9 January 2026.
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