Sony RM-70
A small wired remote that unlocks the transport buttons on a handful of Sony decks — and nothing more.
Overview
The RM-70 is best understood as an accessory rather than a component: a wired remote control unit that Sony's own documentation lists as the optional handset for the TC-V7 cassette deck. The deck's manual is explicit about it — the RM-70 connects to the REMOTE control connector on the rear of the TC-V7 and operates the tape transport functions from a distance. That is the whole brief. There is no tuner inside, no display, no metering; it is a button box on a cable.
What it does, it does in a specific ecosystem. The same manual passage notes that the RM-70 can be used alongside the RM-65 synchro remote control unit, which enables synchronized operation with selected Sony turntables, or with the ST-V7/V7L system control tuner for remote control of the audio system. In other words, the RM-70 was one node in a small remote-control network Sony built around the V7-series components. Collectors chasing a complete TC-V7 stack should treat the RM-70 as part of the set rather than an optional extra — the deck was designed to be driven from it.
One function is documented in detail: the RM-70's REC MUTE button mirrors the AMS key on the deck itself during AMS operation. Pressing it remotely lets the user step the selection-skip count in the deck's display window without walking over to the front panel — the same 1-through-9 increment the AMS key provides locally. That is a narrow, slightly odd feature to highlight, but it tells you something honest about the unit: this is a convenience handset for people who already own the deck and want to skip tracks from across the room.
Buyers should be careful with the model name. The RM-70 designation was also used by Rolls for an unrelated Mic/Source Selector mixer, and JVC listed an "RM70 remote" in a studio inventory alongside its 6400 half-inch VHS machines. Neither is the Sony unit. The Sony RM-70 is the small wired handset described in the TC-V7 manual — if a listing shows XLR inputs, phantom power, or tone controls, it is the Rolls mixer and not this device.
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