Some whooshing sounds can be just corrosion on the valve pins or sockets,
but it could be almost anything of course including drying out capacitors
causing either noise or instability, or a dodgy high value resistor.

Even switches have been known to case it.

A careful wiggle and prod might indicate if its valve related or switch
related.
Use something insulated obviously.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"RJH" wrote in message
...
My 20 year old Rose valve preamp has started making a 'whooshing' sound,
varies in intensity, with a steady rush of background hiss. Might it be
the valves? Everything lights up, and I've had the back off and all looks
in order.

For now, I'm using an older(er) NAD 3020 integrated amp in preamp mode. It
works fine, but sounds 'soft' by comparison with the Rose (when it
worked) - 'smooth' treble and a quite overblown bass. I did notice this:

https://flic.kr/p/rjtZuf

when I got it out the cupboard - but I'm guessing all that mess is glue?
Anything look untoward?


--
Cheers, Rob