Shushing Sound from preamp

[rockpassion]

I have an on and off again shushing sound which comes and goes.  It does not appear to be volume related.  Also, it takes about 15 - 20 minutes to begin.  I  thought it had to do with 300b sockets so i cleaned them with deoxit and the shushing sound goes away for awhile.  However, when I manually wiggle the tubes the shushing (sounds like tube rush) does not increase or  decrease.  This also only happens  when I listen to LP's.  I have switched IC"s around but it does not stop or alter the noise.  I cannot hear it when the music is playing.

Any thoughts on how i might isolate this to figure out what is causing this.? 

Thanks

Richard

[Doc B.]

Perhaps I misunderstand this, but if it only happens when listening to LPs it seems most likely that the issue is coming from somewhere in the turntable/phono stage part of the signal chain, ahead of the BeePre.

[Paul Birkeland]

i cleaned them with deoxit

I would replace the sockets immediately and definitely do not do that again. 

This also only happens  when I listen to LP's

This would indicate that the issue is happening before the BeePre.