I hope I'm not imposing on you too much. I know you must be incredibly busy with all of the newbies like me asking newbie questions all the time.
But you have more expertise with tubes with anyone I know of, so I was hoping you may be able to shed some light for me. I've googled it, but haven't found what I'm looking for.
Basically, I just bought two tubes on ebay that are supposed to be vintage Telefunken 12ax7's that tested as new. I haven't had them tested yet, but they do sound really, really good. My question is that both tubes are labeled as "The Fisher". Below that they're both labeled 12AX7/ ECC83 with a vertical HG to the right. The last of the printing says Made in West Germany. On the very bottom of the tube between the pins, each tube has a diamond imprinted in the glass. One tube has "16" there, with what looks to be a very light backwards "2" as a subscript between the 1 and the 6. The other tube has what looks to be "02" with a 3 subscript between the 0 and 2.
I'm not Myles, but they sound authentic to me. The white print will come off very easily on any of the Telefunkens like that I've seen. Many are "graded" price-wise by the condition of the printing.
Fisher Radio made some high-end home audio equipment back in the day. The founder had Avery Fisher Hall, home of the New York Philharmonic, named after him. The product was labelled "The Fisher", like "The Gibson" early mandolins, guitars, etc. Fisher used only the best and among them were Telefunken and Mullard tubes.
Are they smooth or ribbed plate? I'm betting smooth. Great find, by the way !
See if this link to a picture works. If not Tube World has the picture of some ribbed plate Telefunkens labelled "The Fisher". www.tubeworld.com/12ax7rib.jpg [ copy and paste it into your address bar ]
Thanks for that link. Mine are ribbed, but everything else checks out, bluish glass, diamond oriented correctly, the crimps are "correct", and the pin connections at the bottom of the inside of the tube look the same.