12AT7
TELEFUNKEN
These tubes can be described as having a very extended open air sound to them.A fairly flat midrange and tight bass response.Great for hi-fi and vocal pre amps.There some of the best ever made,and becoming harder to find at a good price.A true Telefunken should have a diamond on  the bottom of the tube.
12AX7
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TELEFUNFEN 12AT7
Here is a nice 12at7.Printing still not bad.
Still strong.Great tube for vocal pre amps or hi fi amp.
40$
TELEFUNKEN LABELED FISHER
Here are two Telefunken12at7 labeled Fisher.The Fisher labeled Telefunkens are very common.Yes it is a Telefunken.Made in west Germany.Diamond on the bottom.Same great quality
35$
TELEFUNFEN 12AT7
Here is another  nice 12at7.Printing good
Same as the others
Great tube
40$
All these tubes will have the signature diamond etched on the bottom of each tube.If you find one of these tubes and your not sure,look for this on the bottom.
There are many faked Telefunkens out there.I have one.Buyer beware
GE
RCA
AMPEREX
TUNG-SOL
SYLVANIA
MULLARD
BRIMAR
WESTINGHOUSE
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TELEFUNKEN 12AX7
I have just the one 12ax7 right now.The picture on the right is the same tube.
High Resolution/Clear Detailed/High-End Extension.
Great for vocal pre amps.
50$
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ANTIQUE TUBES
EL 84/6BQ5
Telefunken EL 84s.Cream of the crop EL 84.Two available
30$ per tube
EBF89=6DC8
Telefunken EBF 89.
EF 89=6DA6
ECC85=6AQ8
Telefunken ECC 85.
Telefunken EF 89