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11th December 2004, 07:12 PM
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#31 |
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diyAudio Member
Join Date: Jan 2003
Location: Milwaukee, WI
 
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Unless that's a slit in the plate, it looks like it's glowing
 Oh well, ratings shmatings  My Revision 3, the proper blue glow  Well... a little overexposed. And blurry. Not bad for a dark shot though...
__________________
See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!" |
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12th December 2004, 04:34 AM
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#32 |
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diyAudio Member
Join Date: Jul 2003
Location: Wayne, West Virginia
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Ok guys, I did a couple of shots of an E34L in a normal operating condition taken in the dark. I manipulated the pics in photoshop to highlight the blue glow and to cut down on image size. I could've increased the bias current to make the blueglow more prominent but...
The first pic shows the blue glow inside the tube. You can see it through the slots. Wayne
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12th December 2004, 04:43 AM
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#33 |
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diyAudio Member
Join Date: Jul 2003
Location: Wayne, West Virginia
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And in the second pic you can see an 8 shape on the inner surface of the glass. It's kind of hard to see...
This is absolutely normal guys! When the tube was new this glow was more prominent! So don't fret! I can't stress this enough: If it's a pretty blue it's normal; So crack a beer and sit back and ENJOY the SHOW! If it's purple or pink and floats around that's bad and you will get a lot of noise that's not musical (to most of us!) coming from your spkrs! Wayne |
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12th December 2004, 09:55 AM
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#34 |
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diyAudio Member
Join Date: Jul 2003
Location: Wayne, West Virginia
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12th December 2004, 10:03 AM
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#35 |
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diyAudio Member
Join Date: Jul 2004
Location: Melbourne, Victoria
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Look carefully at the septar sockets.
Solid-state blue glow... ugh... 
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22nd October 2009, 04:26 AM
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#37 |
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diyAudio Member
Join Date: Sep 2006
Location: Pleasant Hill, CA
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This one is dead:
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The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity! |
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22nd October 2009, 06:45 PM
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#38 |
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diyAudio Member
Join Date: Sep 2003
Location: Alps:Tube amp designs over 150W, SMPS guru.
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Waveborne: that's a good one of a bad one; Try another 88; a serious damaged screen:
On warm up most of the blue was on one side; with a small concentrated area lower left. The other pic is ++ current half tube rating, the electron beam is one sided. (If you donna turn up the juice you won't see all the defects). Symptoms; high thd.  Motto. Use screen resistors !richy |
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