I've been there with other equipment.
problem must be isolated before jumping to new tubes.
problem in both channels?
what channel? first move tubes 1 at a time l to r, see if problem moves to other side. If not, switch another one.
cables? anything new?
rare, but something in speaker crossover could be amiss, do you have small speakers to hook up just to prove the problem persists with any speaker?
problem must be isolated before jumping to new tubes.
problem in both channels?
what channel? first move tubes 1 at a time l to r, see if problem moves to other side. If not, switch another one.
cables? anything new?
rare, but something in speaker crossover could be amiss, do you have small speakers to hook up just to prove the problem persists with any speaker?