Yioryos, first of all, 6922 Telefunkens are not very good (in my opinion). You should consider 6DJ8 Telefunkens instead.
I just clicked over to EBAY and looked at completed items.
Today, 6 Telefunken 6DJ8's closed at $25.00 each, "pulls" from a Hewlett-Packard oscilloscope. HP graded tubes tougher than most equipment manufacturers and these in good shape would be as good as new.
This type tube has a VERY long life. I put a used pair in my Aesthetix Io about four years ago and they still test and sound perfect.
Another 6922 option is the Mullard gold pin. I bought dozens of these a few years ago and prefer them to Siemens. I'll bet they can still be found if you look around.
I have hundreds of tubes, many NOS such as Genelex KT77 are getting too expensive, but other options usually exist, and in this case the Mullard EL 34 XF2 B.
I just purchased 17 of these XF2 B Mullards (all test new) at $53.00 each. Some people ask that for Russian Mullards EL34's, reproductions which are no better than Electro-Harmonix.
So, I believe NOS (or good used) vintage tubes are not only worth the effort and investment, they are a necessity in a high end hi fi system. Don't get distracted and pay the highest price, shop smart and stock up on the tubes you really need when you find them at a fair price.
I just clicked over to EBAY and looked at completed items.
Today, 6 Telefunken 6DJ8's closed at $25.00 each, "pulls" from a Hewlett-Packard oscilloscope. HP graded tubes tougher than most equipment manufacturers and these in good shape would be as good as new.
This type tube has a VERY long life. I put a used pair in my Aesthetix Io about four years ago and they still test and sound perfect.
Another 6922 option is the Mullard gold pin. I bought dozens of these a few years ago and prefer them to Siemens. I'll bet they can still be found if you look around.
I have hundreds of tubes, many NOS such as Genelex KT77 are getting too expensive, but other options usually exist, and in this case the Mullard EL 34 XF2 B.
I just purchased 17 of these XF2 B Mullards (all test new) at $53.00 each. Some people ask that for Russian Mullards EL34's, reproductions which are no better than Electro-Harmonix.
So, I believe NOS (or good used) vintage tubes are not only worth the effort and investment, they are a necessity in a high end hi fi system. Don't get distracted and pay the highest price, shop smart and stock up on the tubes you really need when you find them at a fair price.