Hey, are you sure that's a remote set? I am not sure that it is, as it shouldn't have any channel knob if it's remote. But it's been a long time, and I might be wrong on that.
If it's a remote capable set, the one you show might work some of the functions, but that was for a newer set (CTC-99-CTC-101) and doesn't have an on-off control. The one Geoff shows might be correct for that set. Most CTC-81s had the hated "0-9" keyboard that had only an OFF button, and to turn the set on, you had to select a channel. And there was NO way to power the set on without the remote
. It was a werid remote, with a padded upholstered case!
Charles