I have heard of two SLP-05 failures in my neck of the woods in the past 12 months.
These tubes are supposed to last for ages, 10 years for new production, 25 years or more if one is lucky to find an NOS Mullard rectifier.
Look how cramped and poorly-ventilated is the rectifier and decide for yourself if this is good or bad design:
http://www.asi-tek.com/sitebuilder/images/IMG_2986-471x349.jpg
These tubes are supposed to last for ages, 10 years for new production, 25 years or more if one is lucky to find an NOS Mullard rectifier.
Look how cramped and poorly-ventilated is the rectifier and decide for yourself if this is good or bad design:
http://www.asi-tek.com/sitebuilder/images/IMG_2986-471x349.jpg