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Is the sound coming from the speaker? With that loud of sound you probably can feel the cone of the speaker vibrate. It could be that the vertical sweep signal is getting into the sound amplifier. Re-check your work. Some set use the audio amplifier to reduce the power supply voltage to other parts of the set. The electrolytic caps around the audio amplifier are very important. What you are hearing may be the result of changing a few caps at a time.
If you are unsure of where the sound is coming from, disconnect the speaker and substitute a 4 to 10 ohm resistor of a couple of watts size. It could be something else vibrating like the yoke or transformer.
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