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Old 2nd December 2007, 04:32 AM   #1
fauxpas is offline fauxpas  Australia
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Default Tube dropping - Help?

OK, I'm listening away at lowish volume and notice the right channel is a little low, so I ignore it thinking it may be the way Jose Felliciano is recorded, I ain't heard him in a while. I get up to walk out and make a coffee and notice one tube not lit at all and it's the furthest right tube in this pic.

Click the image to open in full size.

So I swap the two on that channel around and the suspect tube lights up for a few seconds then dies, so it's the tube? Not the socket?

I then change the tube to the furthest left on the left channel and it plays fine. When I did this last change, I swapped the speakers back to 4ohm taps from the 8ohm taps.

Could this have been the issue? Or is the tube stuffed? It is the only one with brown marks on the top of the tube and discolouration of the metal inside.

Click the image to open in full size.
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Old 2nd December 2007, 05:06 AM   #2
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It could be a loose connection between the tube pin,and the little wire that comes out of the glass.
If you have a soldering iron,try heating the filament pins (or all of them,heck) and maybe apply a bit of solder,if you like.

Or,maybe the filament wire is broken/loose inside the tube,if so it's stuffed.
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