Quote:
Originally Posted by old_coot88
Vts1334,
As was suggested back in posts 210 and 214, what you describe sounds more like something under the 1X2, not the tube itself, is doing the arcing/sparking.. like maybe a leakage path from the socket to ground.
As a test of this theory, if it's possible to temporarily 'float' the socket by removing whatever it's mounted to, that would eliminate a leakage path as the problem.
oc
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I did this. The socket was only connected to the tube and the lead to the picture tube. I still had the same problem. The sparking is definitely coming from inside the tube itself. The problem I had below/around the tube was corona discharge from various locations, the "tire," the filament loop, the connection to the wire lead to the picture tube, etc...
Wouldn't it make sense that if those components are driven past their voltage limits that they would begin to show corona discharge?
Quote:
Originally Posted by old_coot88
It seems very doubtful that three 1X2s are all gonna be displaying an acring/sparking problem such as you describe, even with the driving voltage being a little over spec. The tubes should have enough 'headroom' to be able to handle it without a problem.
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How much head room do you think they have? With the input voltage at 90v y and z are already at 270vdc. At input voltage of 95v and the anode voltage reading 14kv (the limit according to the 16gp4 spec) there is no problem in the high voltage area. Above 95v input, when y and z get up over 310v then SPARK! I haven't measured anode voltage when the 1X2 is at it's fail point but I suspect it's a good deal over 14kv.