Hi
I have a lovely 2 box Croft preamp (micro A upgraded to 25RS+ spec by Glenn about 5 years ago). It has developed an intermittent issue whereby after being powered up for a while it makes a noise that I can best describe as wind blowing through trees. It stops when the preamp is switched off and then on again.
I was wondering if anyone had any idea of what could be the cause of this? Faulty valve maybe?
Thanks for any thoughts.....