Is this tube rush ?

When my tube phono preamp is turned on I hear a slight rushing/ whooshing noise as I turn up the volume on my amplifier. When music is playing the whoosh is inaudible but it reappears on very quiet passages e.g between tracks so I suspect it contributes to the noise floor. Is this what people call " Tube rush"?
If so how can I reduce it? Is it due to aging tubes or an inherent result of the circuit design and thus incurable?