whistling? interesting way to put it...Originally posted by larrylover
If it is an early Blue Tick, I don't think you can change the tubes to other types. If you can, you would definitely have to rebias to do it. I think the whistling is a feature of class A amps. The Alessandros are true class A at all times.
I would check with Alessandro about these questions. Others who have picked up his amps in the secondary market have reported that he is very helpful.
I hope you enjoy the amp.