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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 22nd January 2013, 10:04 PM   #11
BillEpstein is offline BillEpstein  United States
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Quote:
Originally Posted by rknize View Post
Only a few of them glow blue...
How come my metal base SED 6550 s don't glow blue? Huh?
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Old 22nd January 2013, 10:22 PM   #12
rknize is offline rknize  United States
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Not enough air in them.
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Old 22nd January 2013, 11:25 PM   #13
KatieandDad is offline KatieandDad  United Kingdom
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Hopefully all the tubes glow. But a relatively small cap will reduce the flicker to the point where it wont be noticed.

I'm not a tubie but from what I read "Blue is Wrong", "Red is Right"

Last edited by KatieandDad; 22nd January 2013 at 11:28 PM.
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Old 23rd January 2013, 05:13 AM   #14
rknize is offline rknize  United States
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Some blue is OK. Blue on the glass for example...just impurities in the glass getting excited by stray electrons. Certain SED tubes really glow.
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Old 23rd January 2013, 10:55 AM   #15
rock12 is offline rock12  United States
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thanks for the help. yes the tubes will light up if the amp is on but I just wanted know if I was on the right path, All my parts in about 2weeks cannt wait
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Old 30th April 2016, 09:45 PM   #16
acceler8 is offline acceler8  United States
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I used a setup similar to this:
Click the image to open in full size.

Edit: this assumes no other resistors (e.g. for 12V supply)

Last edited by acceler8; 30th April 2016 at 09:47 PM. Reason: 12V Note
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