Anyone know how long it it takes for a tube to break-in enough to stop humming? I've been conditioning a brand NIB (not NOS) 6SN7 Elecctro-Harmonix tube for just about 24 hours and there's not been any really noticeable decrease in the hum - most prevalent in the L channel. I know I need to be...

Hi there,   New to the forum. Been an audiophile all my life. Having just found it whilst searching for articles discussing recommended tubes for the DarkVoice 336 SE which delivers Tuesday. Glad such a forum exists. I own a Little Dot+ and assume that is a hybrid amp. Pls correct me if I am...