These nine model groups can record four or eight channels at once. Compare their factory images, tape widths and documented codes, then open the model guide and source.
Six model groups, on quarter-inch or half-inch tape.
⤢ zoomFirst generation · 4 tracks / 4 record channels
Four-channel quarter-inch recording. Some QXD units use a separate amplifier cabinet.
Documented model codes to check
MX-5050-QX · MX-5050-QXH · MX-5050-QXL · MX-5050-QXD · MX-5050-QXHD · MX-5050-QXLD
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
Image: Factory drawing
Photo wanted
The surviving Mark II sheet pictures the two-channel model. A verified Mark II-4 image is wanted.
Mark II · 4 tracks / 4 record channels
Four-channel desk-top with separate electronics; the factory sheet specifies four-track heads.
Documented model codes to check
MX-5050-½QXHD · MX-5050-½QXLD
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
⤢ zoomMARK III · 4 tracks / 4 record channels
Four meters in the raised electronics unit behind the desk-top transport.
Documented model codes to check
MX-5050 MKIII-4
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
Image: 1984 brochure photograph
⤢ zoomMARK III series · 4 tracks / 4 record channels
An upright four-channel machine in the MARK III line-up.
Documented model codes to check
MX-5050 BQII
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
Image: 1984 brochure photograph
⤢ zoomB-III era · 4 tracks / 4 record channels
The later upright four-channel quarter-inch model.
Documented model codes to check
MX-5050 BQIII
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
Image: 1991 data-sheet photograph
⤢ zoomMARK IV · 4 tracks / 4 record channels
Four-meter desk-top in the final MX-5050 series.
Documented model codes to check
MX-5050 MKIV-4
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
Image: 1991 data-sheet photograph
Three model groups, all on half-inch tape.
⤢ zoomFirst generation · 8 tracks / 8 record channels
Half-inch transport and separate eight-channel amplifier in the later 8SD manual photograph.
Documented model codes to check
MX-5050-8 · MX-5050-8D · MX-5050-8SD · MX-5050-8SHD · MX-5050-8SLD
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
Image: 8SD manual photograph
⤢ zoomMARK III · 8 tracks / 8 record channels
Eight meters above the desk-top transport, with channel electronics below.
Documented model codes to check
MX-5050 MKIII-8
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
Image: 1984 brochure photograph
⤢ zoomMARK IV · 8 tracks / 8 record channels
Eight-meter desk-top in the final series, with a lower bank of channel electronics.
Documented model codes to check
MX-5050 MKIV-8
Plate photograph wanted. Confirm the code on your machine’s rear identification plate.
Image: 1991 data-sheet photograph