[kittonian]

There is no difference in sound between the two. Some people "think" there is for whatever reason but I can tell you first hand that Peluso has matched a red tube with a Telefunken tube for a stereo pair for a few of our clients and no one could tell the difference.

Here's what I tell people. If you have to have the Telefunken name go for it, but be aware that these tubes are no longer in production and when the stock runs out you may find yourself on eBay paying quite a bit of money for a replacement if/when you ever need one. On the other hand, the red american tube is in production and a replacement will cost you a whopping $30.