On 14/03/2015 00:18, Phil Allison wrote:
RJH wrote:

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.


** After 20 years, it is time you replaced all the valves.


Yes, I'd better bite the bullet I suppose. Prices seem to vary widely (4
x National ECC82) - this seems to be about the cheapest:

http://www.rapidonline.com/electroni...de-valve-35348


I can find no details on the net about the unit other than it uses four small valves, possibly ECC83s or 12AX7s.


It's a Rose RV23-S. I got it on ebay for less than £100 IIRC, with
matching power amp, new.

I think they closed about 10 years back. Look very nicely made to me.

The noise you describe is a typical valve fault.


Grand, thanks.


--
Cheers, Rob