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Is this normal?
Posted:
Tue Sep 17, 2013 7:36 amby ica2000
Hi All,
built my first get*set*go and everything is fine according to the sound. (Quite fine) BUT I noticed a blue to ultraviolet glow coming off the 300b's. 300b mods are straight off the thread from the splash page including remaking a diode octal plug for the rectifier. The photo was taken in darkness over 60 seconds. Its hard to see in this photo but the heater elements do peek out more on the tube on the left with the larger amount of blue light.
Re: Is this normal?
Posted:
Tue Sep 17, 2013 8:01 amby TerrySmith
Yep, perfectly normal. I've noticed the blue glow on Sovtek / Electro Harmonix 6B4G's also. It usually fades away over time.
Nice lookin' amp also!
Re: Is this normal?
Posted:
Fri Sep 20, 2013 10:56 amby johnf
The NOS Russian 6C4C tubes also have this blue glow
John
Re: Is this normal?
Posted:
Fri Sep 20, 2013 8:21 pmby EWBrown
The blue glow, if it appears on the inner surface of the glass envelope is normal and OK, if it appears inside the plate, then that indicates a gassy tube.
Re: Is this normal?
Posted:
Fri Sep 20, 2013 10:46 pmby ica2000
Thanks,
Always pays to double check. The blue glow is "on" the envelope so that is good. Now that I know what it is my inner OCD adult is bugged that the glow isn't equal in both tubes.....
Re: Is this normal?
Posted:
Mon Sep 23, 2013 8:40 amby EWBrown
This phenomenon is common with power triodes and Beam Power Tubes. Sometimes the blue glow will pulsate in time with the music being played.
/ed B
Re: Is this normal?
Posted:
Sat Sep 28, 2013 9:29 amby johnf
My tubes don't glow evenly either. They also pulsate in time to the music .
John
Re: Is this normal?
Posted:
Sat Sep 28, 2013 4:34 pmby Geek
If music plays and no smoke is billowing out, call it a day and enjoy
Re: Is this normal?
Posted:
Sat Jan 25, 2020 3:27 pmby jwhitmor
Wow, I love it. Where can I get some of those glowing tubes?
