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I recall the 51 has the "F deck" with a power transformer linear power supply, the 48 has the" J deck" with a switch mode power supply.
I have a S-VHS HS-U790 with the J mechanism. Just a few years after I bought it, I had to replace the entire deck mechanism. The plastic guides for the cassette holder would crack and warp, and cause it to hang up. No glue would hold that slippery delryn type plastic. Fortunately Mitsubishi realized the error and changed the design, and made the whole mechanism available for about $60 dealer cost as I recall. Had to transfer the capstan motor, cylinder assy, AC head assy and align the tape path and X-value of the AC head. Still have that VCR too. Last time I used it I had to replace the bottom belt which had turned to goo.
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