How can I still hear my tuner when it's off?

your tuner may still be on electrically, but the display and output section is "muted" but still "leaking" enough signal to hear it. If you can still change stations, that is probably the case. Some products are built like this to retain memory, always be "warmed up", etc... One of my preamps has an on/off switch that doesn't work as you think it would. All the switch does is turn off the accessory outlets, as the preamp is always on.

What happens if you disconnect power from the tuner at the plug ? This will tell you if the tuner is still actively on somehow or if the tuner is somehow bringing in RFI. Sean
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I follow you, I have had numerous units that have a standy by button as well as an off button. Seeing that the tuner, Fanfare FT-1A, doesn't have both, I assumed off was off.

I cannot change stations while the unit is off, as it's push button. I will have to try unplugging it some time.

It's no big deal, I was just curious.

Brianmgrarcom:

What kind of tuner do you have? If it's a Magnum Dynalab, what you're describing is normal (although a bit disconcerting). I've owned several MDs and still use one today, all of which exhibit this phenomenon. I actually contacted MD and sent one piece back to them because of it, only to find out later that this was normal and MD was not even aware of it at the time.

Normally one would never notice, unless the volume was way up there, so I suspect most people do not even know this is common. Go ahead and enjoy the tuner and rest assured that it is probably working properly.