guitarmanjt Posted May 28, 2011 Share Posted May 28, 2011 At the top of a tube there is what appears to be a silver lining on the inside of the tube. (no, it is not a metaphor to those who know what I'm talking about). In looking at this TungSol 12AX7, there seems to be a rainbow ribbon in this small section of the lining, kind of like an oil spot on wet asphalt. Is this an issue for the tube...is it defective? Link to comment Share on other sites More sharing options...
stein Posted May 28, 2011 Share Posted May 28, 2011 At the top of a tube there is what appears to be a silver lining on the inside of the tube. (no, it is not a metaphor to those who know what I'm talking about). In looking at this TungSol 12AX7, there seems to be a rainbow ribbon in this small section of the lining, kind of like an oil spot on wet asphalt. Is this an issue for the tube...is it defective? Nope. that silver paint looking stuff is to dissipate heat. If you want to "see" wear, look at the tube at the bottom around the area where the pins are and at the base. if it is clear, it is fresh, but when tubes wear it will turn grey down there. Link to comment Share on other sites More sharing options...
guitarmanjt Posted May 28, 2011 Author Share Posted May 28, 2011 Yes, but I am concerned about the rainbow looking ribbon on it Link to comment Share on other sites More sharing options...
Silenced Fred Posted May 28, 2011 Share Posted May 28, 2011 I thought this was an offspring of Redtube... Link to comment Share on other sites More sharing options...
Riverside Posted May 28, 2011 Share Posted May 28, 2011 Nope. that silver paint looking stuff is to dissipate heat. Do you make this stuff up? Getter Link to comment Share on other sites More sharing options...
stein Posted May 28, 2011 Share Posted May 28, 2011 Do you make this stuff up? Getter I sit corrected. I always thought the getter was that ring thingy deal that heats it up, and I thought the inside flashing was meant to disappate, but it seems I had it all backwards. I feel smarter now. I AM smarter now. Link to comment Share on other sites More sharing options...
damian Posted May 29, 2011 Share Posted May 29, 2011 Sometimes it's good to keep your mind on the getter........ .... The "Village People" used Rainbow Tubes....just sayin'... Link to comment Share on other sites More sharing options...
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