1.5V "amplified ear" debugging
The dashed line indicates that P1 and SW1 are physically connected - like the combined power switch and volume control on older radios.

Since you've omitted P1, you either use a simple SPST switch in place of SW1, or connect the juntion of R8 and the top lead of the jack directly to the battery + terminal.

From your description, I don't think you have any power to the circuit, so it won't work.