How can I limit the volume on integrated amp

Used to be Radio Shack. But any electronics supply store should have them. Should be something like a pack of 5 for a dollar, something like that. Look on-line to figure out a value. I would think something around 100 to 1k ohm but that's just a wild guess. Another option, instead of fixed resistor buy a small trim pot. Essentially a volume control. Then you can fine tune it, and instead of a switch you turn it down when you leave and up when you're there.

If there is a tape record out, this is tied directly to the other inputs. Select an input (say, CD). Take a DMM and place one probe in the left CD input and the other in the left tape out. There should be a resistance of 1k to 5k. If there is a short, then the rest won’t work.

Take a cheap pair of RCA cables and plug them into the tape record out jacks. On each of the other end RCA plugs, solder a 10K trim pot, pin 1 to the inner positive and pins 2 and 3 to the outer ground. Adjust the trim pots for any volume you want and then hide the end plugs so the tenant can’t see.

What this is effectively doing is acting like a shunting volume control.

Or, get an amp with a max volume limit within the setup...

nolacap
How can I limit the volume on integrated amp

You could just put some rca attenuators between the source and the amps input.  https://www.decibelhifi.com.au/rothwell-in-line-rca-audio-attenuators-pair/

Cheers George

yes I used to do this for my cd player in the days before amps had specific cd inputs.Worked ok when attached to the rca interconnect.Cd players used to overdrive earlier amps to distortion.