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Unread 03-09-2009, 05:35 PM   #1 (permalink)
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6L6 tubes' glowing color

Hello, I have a question - 6L6 tubes in my Mesa Roadster glow red, while in H&K Triamp glow blue. Does that mean that ones of them are worn, if so, which ones?
THX
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Unread 03-09-2009, 05:42 PM   #2 (permalink)
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Re: 6L6 tubes' glowing color

I read somewhere that some tubes let in a little oxygen to work properly and this causes them to glow blue. This is only on certain amps and I don't know if yours is or not.
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Unread 03-09-2009, 05:51 PM   #3 (permalink)
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Re: 6L6 tubes' glowing color

Tube Amplifier Debugging Page

http://www.diyaudio.com/forums/showthread/t-118031.html

http://www.torresengineering.com/repredhottub.html

http://acapella.harmony-central.com/...t-1484613.html


What do you mean by "red"..if the elements are an orangey red color it's possibly OK...If the Plates glow red ...turn it off and take it to a competent tech..it may be biased wrong ...it could be worse...but hope foe the best...
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Unread 03-10-2009, 03:54 AM   #4 (permalink)
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Re: 6L6 tubes' glowing color

well, not red but rather orange...sound is pretty ok, and bias is switchable 6L6-EL34 and is set as should be.
Slowhand, thanx for the links, very useful.
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Unread 03-10-2009, 08:52 AM   #5 (permalink)
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Re: 6L6 tubes' glowing color

Oh, one more thing- is it possible in this particular amp to take out two power tubes so that it runs only on two? It's not the matter of reducing the power because it has 50\100 switch but I have only two spare EL34 and would like to try them instead 6L6. If so, which ones can I take out? inner two or outer two?
Thanks
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Unread 03-10-2009, 11:02 AM   #6 (permalink)
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Re: 6L6 tubes' glowing color

Tubes would not operate for long 'if they let in oxygen'. If the plates are glowing bright red/orange, the tubes are toast and take it to a tech; bias or power supply/regulation problems. Blue is fine...
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Unread 03-10-2009, 11:15 AM   #7 (permalink)
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Re: 6L6 tubes' glowing color

a orange hue and the filament orange has never been a problem for me. If its glowing like a light bulb, Id say turn it off. at any rate, perhaps its time for a tune up one way or the other????
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Unread 03-10-2009, 11:24 AM   #8 (permalink)
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Re: 6L6 tubes' glowing color

Yup, was thinking mercury not oxygen... my bad...

Mercury vapor haze is a blue glow which is noticeable between the plate and
filament in Types 82 and 82 rectifier tubes. These are the only types of
Sylvania receiving tubes in which this type of haze appears. The perfect
operation of Types 82 and 83 is dependent upon a mercury vapor which comes from
free mercury that has been placed in the bulb during the exhaust period.
Therefore this type of blue haze is in no way detrimental to the operation of
these tubes.


Gas is a blue haze which is usually confined to the vicinity of the plate and
filament structure. Its presence, when of large content, affects the operation
of a receiver to the extent that erratic performance is noticeable. Gaasy
tubes should always be replaced with new tubes.
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Unread 03-10-2009, 01:21 PM   #9 (permalink)
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Re: 6L6 tubes' glowing color

Ok, I'll show you some pics:




no blue, just red-orange...
what do you think?
The last one is with accidental reflection so don't take this one into consideration...
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Unread 03-10-2009, 02:44 PM   #10 (permalink)
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Re: 6L6 tubes' glowing color

looks good to me
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Unread 03-10-2009, 03:39 PM   #11 (permalink)
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Re: 6L6 tubes' glowing color

Lookin' good!!!!
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Unread 03-10-2009, 03:52 PM   #12 (permalink)
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Re: 6L6 tubes' glowing color

BLUE GLOW
KCA NOS Tubes. Audio tubes for guitar amplifiers and audiophile equipment. 12AX7, 6L6GC, 12ay7, el34, el84, Fender amplifier,5AR4, 5U4GB, cv4004, 6SN7, 8417, 7027, gz34, Mullard, EF86, 6ca7, 6bq5, 7025, 12at7 - Content

Normally orange, but flourescence is okay.
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Unread 03-10-2009, 04:10 PM   #13 (permalink)
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Re: 6L6 tubes' glowing color

THANK GOD!!!!
I was scarred somethin' gonna blow...
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Unread 03-11-2009, 03:55 PM   #14 (permalink)
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Re: 6L6 tubes' glowing color

Philips 7581A's typically have a nice violet blue glow to them...nothing wrong with those.
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