How can I find the output impedance of this circuit?

This is one of the tasks in my BJT amplifier lab. I have to find impedance seen to the right from V1 which can easily be done by taking a frequency sweep and measuring $$\\small \frac{V_1}{I_{C_2}}\$$ at 1kHz. I also have to find the input and output impedances. Input impedance is also easy since I can just divide the input voltage by the current through it. But how to find the output impedance. I know I cannot use the traditional circuit theory method of killing the independent sources and adding a test source since that will change the biasing of the transistors. Also I need to measure it using LT Spice and not calculate it using small-signal analysis.

So what should I do here?

Any help would be appreciated!

• Hint: Change R_L to7 Ohms to 9 Ohms. Since V_out won't change much... Commented Nov 22, 2022 at 16:20

• Yes, but in order to find the two other impedances that I mentioned we do not have to kill the AC input source. Isn't there a way to do so for this case as well. Also the measured value matches the calculated value range for impedance measured to the right from node $V_1$ which is $1k//1k//(\beta + 1)\cdot 8 = 400 \text{to} 500 \Omega$. And the measured value is $406 \Omega$... Commented Nov 22, 2022 at 17:19