What have you purchased recently?

[rgdelato]

@elementze

Do they fail suddenly (like burning out), or is it a slow degradation in sound quality over time?

This got discussed a little bit in the Allnic thread:

@Polygonhell

Depends how it fails, most tubes just fail, usually the filament burns out (like a lightbulb).
Either it just doesn’t work one day when you power it on, or the vacuum is lost, and you get a brief flash followed by nothing.