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In Reply to: RE: Am I missing something, or are you all? posted by JJ Triode on October 30, 2015 at 12:26:38
Thanks everyone for the comments. The connections seem to be identical...but the getters are in different places (rotated 180 degrees from each other). I don't know enough about the internals of the triode components/connections to be certain about any of this but...
Pin 9 on both tubes is connected to a similar point directly above the pin. All the other pins are connected similarly to similar looking locations. The difference is that the getters aren't in the same place on both tubes. As shown in the photos.
I can post more picture if anyone is interested in trying to feret this out further but I now suspect that for whatever reason the getter was installed on the wrong side of the triode assembly. If this is the case, then BC is probably correct and the tube should work fine.
Perhaps I am being a little paranoid. I can't imagine this is a correct situation and suspect that one of these tubes was a factory reject. My real concern is/was that it's not a 6n23p at all...it just looks like one (not necessarily a fake). At this point I still don't believe I will use the tubes however. :)
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I've tested them on my Hickock TV3b/u using the settings for a 6922. They test very strong. In fact that was what first got my attention. The mutual-conductance is waaaay higher than any 6922 (or 6h23p-ev etc.)I've ever tested. I thought wow!... maybe these are 6n1p's or something. Started looking at them and then noticed the physical difference.
You are indeed being overly paranoid. The dish that holds the getter material (it's not actually the getter) serves no function outside of manufacturing.
What's your take on the extremely high mutual conductance readings?
That they are likely unused tubes...
Having tested a great many 6DJ8/6922's on a TV-10, the trans-conductance of a very fresh tube can be off the scale listed as the appropriate range for the tube.
Really? Not my experience at all...until these.
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