well there getting really hot most likely 150 degrees. and another question is the amplifier expecting a signal that has already been pre amplified
Thanks a lot just getting into electronics
Are you talking about R2A, R2B, R3A and R3B?
Have you verified that they are indeed 1W (or higher) sized components?
Have you measured their value to ensure they're 4700 ohms each?
Have you measured the voltage across the zener diodes that they're connected to?
Excessive heat means that they're dissipating a lot of power. Measure the voltage across them and the value of the resistors, and calculate the power dissipated. (you'll have to lift one leg of the resistor to measure it, don't measure it's value "in circuit").