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About a month ago, I purchased a pair of NOS Philips Miniwatt Dario GZ32 (5V4) rectifier tubes (see http://www.upscaleaudio.com/Philips-Miniwatt-GZ325V4_p_80.html for my SET amps from Upscale Audio in California. They were competively priced with a 90 day warranty.After a few hours (10 or so), one of the tubes started to act up, became noisy & appeared to be brightly lit (possible internal short). After contacting Upscale Audio & being advised by them via email, I sent back the tube & a new replacement one arrived in perfect order about a week later.The packing, communication & service provided by Upscale Audio was a very pleasant experience.Thought I'd share a good tube buying experience since there's a lot a nightmarish ones out there...Pete