Tube fakes, any experts out there?

There is some good information at http://www.upscaleaudio.com/
Some NOS fakes are semi fakes. There are tubes that were made at one time in Japan from the original manufacturers specs. So these tubes are fakes, but sometimes very good ones. Some fakes are "rebranded".

Try posting some details on www.audioasylum.com under "tube asylum." Usually some experts there....

Justlisten- were they "bulk packaged" in white boxes from a guy in Singapore, bought via ebay. I bought some too, they are labelled Siemens Germany, and come with individual test results labelled on each box. I bought a matched quad and was wondering the same thing; shouldn't they say W. Germany unless they were pre-WWII?

Follow this link and it should give you a good idea, from audio asylum http://www.audioasylum.com/audio/faq/joes-tubes.html#6DJ8

very informative.

regards