easy way to check if oscillator is working

People may or may not know this little trick to see if the oscillator is working.
Using a transistor radio . Turn the transistor radio on and set it next to the antenna of the radio in question . Make sure the transistor radio is off station . Now turn the other radio and begin tunning it thru the frequencies. If the oscillator is working you should hear a high pitch squeal at some point in the transistor radio . If not then you know you have a problem in the converter/oscillator stage. I hope someone can use this.

That also works for tube radios as well. Good tip!
Thankyou devildog63.

Nice and simple check. Thanks!