There are a LOT of re-branded Telefunken tubes out there (as well as loads of counterfeit ones).
Here are a couple of links that might help:
http://store.t-funk.com/p/telefunken-ecc801s-non-diamond-base
http://www.audiotubes.com/teledate.htm
Here are a couple of links that might help:
http://store.t-funk.com/p/telefunken-ecc801s-non-diamond-base
http://www.audiotubes.com/teledate.htm