The 711 chassis replaced the larger 710 type that was used up until 1980. This new design was more compact and allowed machines to become lighter, slimmer and more versatile. It also made a super small lightweight portable possible. There were a number of style variations of this new chassis. This was noted on the front of the models service manual by the addition of a suffix to the base number. It indicated the type cassette loading method, entryway door used, kind of threading drive mechanism, the reel table design, plus a lot more. This helped the technician know what kinds of additional service requirements to expect. But the basic drum, path and recording process remained the same for the remaining life of Beta. Having this basic chassis to modify made the Beta format more affordable and fully harmonious. Several noteworthy improvements and refinements were made possible by using the versatile 711 chassis. Listed here are the different variations with a few of their notable traits in italics. Click on the design number to open a page on that particulate chassis type.
- 711A.—.SLO-1800 unique loading assembly dual pancake reel motors.
- 711B.—.SL-90, SL-9090, SL-HFR90, SL-2300, SL-2305, SL-2400, SL-2401, SL-2405, SL-2406, SL-2408C, SL-2410, SL-2415, SL-2710, SL-T50ME belt drive loader with dual door entryway. Included the SL-2001 top loading portable.
- 711B2.—.GCS-50, SL-10, SL-20, SL-25, SL-30, SL-40, SL-60, SL-3030, SL-HF300, SL-HF400, SL-HF450, SL-HF500, SL-HF550, SL-HF600, SL-HF650, SL-HF900, SL-HF1000, SL-HFT7 belt drive loader with top hinged entryway door. Included the EDV-9300, EDV-9500, EDW-30F with motor driven reels and loader.
- 711B3.—.SL-100, SL-250, SL-300, SL-330, SL-340, SL-390, SL-S500, SL-S600, SL-810D, SL-840D, SL-860D, SL-870D, SL-HF350, SL-HF360, SL-HFR30, SL-HFR50, SL-HFR60, SL-HFR70 motor driven reel table with top hinged entryway door. Included the EDV-7300, EDV-7500 with capstan driven reel table and motor driven top hinged entryway door.
- 711B4.—.SL-50, SL-55, SL-66, SL-P22, SL-P30R, SL-P44R, SL-P200, SL-P201, SL-P401R reels driven by capstan motor with top hinged entryway door.
- 711CX.—.SL-HF750 linear skating design with motor driven reel table.
- 711D.—.SL-2500, SL-2700, SLO-420 dual pancake reel motors and top hinged entryway door with lift up concealment.
- 711P.—.SL-2000, SL-2005 top loading portables with dual pancake reel motors and motor driven path threading.
- No notation.—.SL-HF2000, SL-HF2100, SL-700 separate motors for loading, reel table and path threading, top hinged entryway door.
To see the different chassis designs illustrated in the service manuals go to "EXPLODED VIEWS" in the left button array or click here.
*Note: this information only applies to those Betas that I carry in inventory or repair. 710 and older chassis design Betas are not included.
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