Journey to the Center of a Tube

Your host Robert Hull takes you on a journey to the center of a tube. You will be astounded at the beauty of this SED 6L6GC tube, so close you can almost touch it. From the outside glass to the deepest filament, see every element in vibrant color ... just please, refrain from feeding the electrons.

Category:

Science & Technology

Tags:

• vacuum
• tube
• TubeDepot
• TubeDepotTV
• beam
• forming
• plate
• mica
• spacer
• glass
• envelope
• control
• screen
• grid
• electrons
• SED
• amplifiers
• microphonics
• getter
• cups
• cathode
• sleeve
• filament

[ILIEKCAKESAM]

I love how enthusiastic Rob is about electronics. He has really taught me alot :)

[TubeDepotTV]

@ILIEKCAKESAM - Rob thanks you for the kind words ... as he sips on his 5th cup of strongly caffeinated coffee.

[5150VanAlien]

Hi There, I have an ENGL Savage and even with the standby off, there's still a static/buzzing noise coming through the speakers. When I turn the power off, the speakers can make a popping noise. Also, with the amp on, the 6550 power amp tube starts to glow a little blue. Any suggestions? I think the 6550 needs replacing but could it be other issues say, grounding? An advice is appreciated.

[TubeDepotTV]

@5150VanAlien - blue glow isn't necessarily an indication of a bad tube. Do a search for "blue glow in vacuum tubes" and read about FLUORESCENCE. In regards to your amp, it sounds as though the amp needs servicing. Locate an experienced tube amp technician for assistance.

[5150VanAlien]

@TubeDepotTV Thanks. However, regarding my amp making the static noise, do you have any idea(s) what it could be?

[TubeDepotTV]

@5150VanAlien - the only user serviceable parts are the tubes. You can try changing the tubes ... power and preamp ... to see if the noise goes away. If it doesn't, then you know it is the amp and I recommend taking it to a qualified technician.

[TubeDepotTV]

@maciverandy - gay as in happy?

[TubeDepotTV]

@metalmanin -

... you don't need to see his specification sheet ...

... these aren't the tubes you are looking for ...

... he can go about his business ...

... move along ...

[Mathematica100]

Well done. I work with radio broadcast tubes that have a plate dissipation of 20,000 watts (class B). They wouldn't work at audio frequencies, but can you imagine if they could? Wow!

[TubeDepotTV]

@Phrennie which witch ... the twitch switch witch?

[Phrennie]

She's a witch, Lisa.



[LordKelvin100]

@Sixalienasa: The screen is included to break up the reverse transfer capacitance between the control grid and plate, as it sits at AC ground. This reduces the Cmiller contribution to input capacitance to improve high frequency performance, and also to break up a feedback path that triodes have that can cause oscillation. For triodes, you need external neutralization to stop that. With screen grid tubes, you can frequently avoid neutralization.