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Old 10th March 2012, 08:25 AM   #21
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Quote:
Originally Posted by boywonder View Post
Well, now I had to look again.....and it appears to have a diamond....but the printing on the glass is clearly not the flakey stuff typical of the other Telefunkens in my stash.
What a lucky guy you are, boywonder!

With the diamond at it's base it obviously is a TELEFUNKEN ECC803S! Counterfeiting the diamond takes that much effort that no one has tried it yet.

Congrats!
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Old 10th March 2012, 01:31 PM   #22
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Originally Posted by Kay Pirinha View Post
With the diamond at it's base it obviously is a TELEFUNKEN ECC803S! Counterfeiting the diamond takes that much effort that no one has tried it yet.

Congrats!
Well, thanks! (I think....) before I break out the champagne....there area no seams in the glass either.....and the gold pins are mighty shiny for a 50 year old tube.

I only have one of these, so it won't do me much good in HiFi anyway......if it's authentic I'll probably sell it to fund other projects.
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Old 10th March 2012, 04:27 PM   #23
DF96 is offline DF96  England
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Glass seams generally indicate Philips group manufacture.
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Old 10th March 2012, 08:26 PM   #24
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by boywonder View Post
Well, thanks! (I think....) before I break out the champagne....there area no seams in the glass either.....and the gold pins are mighty shiny for a 50 year old tube.

I only have one of these, so it won't do me much good in HiFi anyway......if it's authentic I'll probably sell it to fund other projects.
IIRC there shouldn't be seams on a Telefunken tube (I have a number of different types), and the gold will look as new in 3000 years as it does today providing the plating is thick enough, and it hasn't been plugged into a socket frequently enough to wear it.
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Old 10th March 2012, 09:07 PM   #25
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Thanks Kay, DF & Kevin!

I checked a few of my other Tele's and no seam.....

Usually the owner of the item in question is attempting to convince others that the item is not a fake.........

I'll have to test it on my Hickok; it looks new.

now back to our regularly scheduled programming....

Last edited by boywonder; 10th March 2012 at 09:25 PM.
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Old 11th March 2012, 10:37 AM   #26
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Originally Posted by boywonder View Post
I only have one of these, so it won't do me much good in HiFi anyway......if it's authentic I'll probably sell it to fund other projects.
Good luck! And don't forget to mention terms like "TELEFUNKEN", "ECC803S" (of course...), "diamond button", "famous frame grid construction", "special quality" etc. in your offer. These will bring you the money you desire!
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Old 11th March 2012, 01:02 PM   #27
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This is only half on-topic. I recently purchased an assortment of newly manufactured dual triodes to test, among them 2 Tung Sol 12AX7's. At first they were both great, one of the best in my application, but after a few weeks of testing (lots of amp power cycles) one of the Tung Sol's developed a horrible noise. It sounds like an intermittent connection, very scratchy sounding, the gain wavering up and down it seems. The other one is still running very well. It sounds so good that I want to buy more, but not if there's a quality issue with them...
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Old 11th March 2012, 01:45 PM   #28
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Originally Posted by doozerdave View Post
This is only half on-topic. I recently purchased an assortment of newly manufactured dual triodes to test, among them 2 Tung Sol 12AX7's. At first they were both great, one of the best in my application, but after a few weeks of testing (lots of amp power cycles) one of the Tung Sol's developed a horrible noise. It sounds like an intermittent connection, very scratchy sounding, the gain wavering up and down it seems. The other one is still running very well. It sounds so good that I want to buy more, but not if there's a quality issue with them...
Have you swapped tube positions, to verify that the problem follows the tube and is not a cold solder joint, etc?
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Old 11th March 2012, 07:21 PM   #29
kevinkr is offline kevinkr  United States
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A sample size of two is not enough to make any assessment of reliability should that tube turn out to be bad. (Although unfortunately the trend may prove valid in a larger sample.) You need a larger sample size, and I generally look at a sample size of ten pieces as the absolute minimum for such an assessment.

Anecdotally speaking it is true that current tube production is generally less reliable and consistently has a higher infant mortality failure rate than would have been the case at the height of western tube manufacturing. Lots of corners cut, poor design, poor processing, materials issues, and relatively lax QC are all reasons for the difference in quality..

I avoid most current production for my own projects, obviously for commercial products it's something of a different matter.

I'd recommend buying at least a couple more pairs and evaluating them as a lot.
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Old 11th March 2012, 11:32 PM   #30
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Originally Posted by boywonder View Post
Have you swapped tube positions, to verify that the problem follows the tube and is not a cold solder joint, etc?
At first I thought it must be a bad socket, or solder joint, but I've swapped in several other tubes since then without problems. I will try that tube again tonight (I stopped using it completely since it was affecting my tone tweaking) to see if it was a dirty socket contact, or something like that.

Quote:
Originally Posted by kevinkr
A sample size of two is not enough to make any assessment of reliability should that tube turn out to be bad. (Although unfortunately the trend may prove valid in a larger sample.) You need a larger sample size, and I generally look at a sample size of ten pieces as the absolute minimum for such an assessment.
I totally agree, however, in light of the current thread, it makes me doubt Tung Sol. The EH and Sylvania's I got are working great. Even the no-name Chinese one is still working fine, but again, the sample is so small that maybe it's a fluke that any of them work. But thanks for reminding me, I've got some old Roger's 7025's that I should throw back in there now that the project is done.

Last edited by doozerdave; 11th March 2012 at 11:37 PM.
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