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Matrix (stamper) numbers are assigned to the lacquer masters used to make the record pressing plates. The number usually appears etched in the "dead wax" -- the inner spiral groove area -- of the record. The primary purposes of the matrix number are to match up lacquers and the stampers made from them to master tapes and to identify the lab that cut the lacquer. Here are the matrix numbers for Sonobeat's commercially released singles and albums, test pressings, and non-commercial demo and advance pressings.

Color indentifies where the lacquer was mastered.

Houston Records, Inc.
(Houston, TX)
Sidney J. Wakefield & Co. (Phoenix, AZ) Robert Fine Mastering
(New York, NY)
LongWear Stamper Co. (blank matrices used by many pressing plants, including Houston Records) Nashville Record Productions
(Nashville, TN)
King of Nashville
(Nashville, TN)

In order of mastering, not release date:

The Singles
Artist Catalog number Matrix number(s)

Lee Arlano Trio PJ-s501 LH-3508
LH-3509

Sweetarts R-s101 LH-3510
LH-3511

Sweetarts (test pressing) None

IFM-NY


Don Dean PV-s401 LH-3922
LH-3923

Lavender Hill Express R-s102 LH-3932
LH-3933

Shiva's Headband (test pressing - unreleased) R-s103 LW

Conqueroo R-s103 (R-s104 is etched in dead wax) LW

Lavender Hill Express R-s105 LW

Thingies R-s104 SJW 10783

Afro-Caravan R-s106 SJW 10784

Winter R-s107 SJW 10863

Ronnie & the West Winds C-s108 SJW 10894

Bach Yen PV-s109 SJW 10895

Lavender Hill Express (radio station version) R-s110
R-m110
SJW 10896
SJW 10897

Lavender Hill Express R-s110 SJW 10897

Jim Chesnut PV-s112 SJW 10906

Fran Nelson PV-s113 SJW 10907

Paul New (test pressing - unreleased) PV-s114 (vocal side)
I-s114 (instrumental side)
SJW 10908

Ray Campi Establishment PV-s111 SJW 10930

Plymouth Rock R-s114 12706

Lee Arlano Trio PJ-s117 12707

Vince Mariani R-s116 12719

James Polk & the Brothers R-s115 12720

Mariani R-s118 13884

Royal Lights Singers G-s119 15921

Royal Lights Singers G-s120 Unknown

Arma PF-121 NR5676-1
NR5676-2

Jeannine PS-122 No matrix number

The Albums
Artist Catalog number Matrix number

Lee Arlano Trio PJ-s 1001 LH-4107
LH-4108

Winter (advance pressing) R-s 1002 SJW 10893

Afro-Caravan (advance pressing) R-s 1003 SJW 11550

Herman Nelson 1 (song demo) HEC-285M
HEC-286M
11687

Bill Wilson (song demo) WEJ-285M
WEJ-286M
12715

Herman Nelson 2 (song demo) WEJ-287M
WEJ-288M
12960

Mariani (advance pressing) HEC-411
HEC 412
13510

Roy Headrick (song demo) WEJ-289M
WEJ-290M
13898

David Flack Quorum DFQS-100 No matrix number

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