Do Sweep tubes Glow Blue?

[webby]

Hey Big will,
Those Russian 6P3S look great.
May i ask what brand they are and what voltage you run them at?
I am looking for different valves to try out in a simple SE i am building.
I also want the blue glow!!!!
Are there any other valves i should be looking at, ideally a drop in on the Simple SE?
Cheers
Ian

 

[rknize]

My SSE runs at 460V, so lots of my tubes glow blue. The SED KT88s have a very uniform and soft blue glow all the way around the big part of the envelope. They are quite pretty in the SSE. My SED EL34s also have a cool glow around the suppressor grid wires.

Most of my Reflektor and JJ tubes only glow through the alignment holes in the plates and through the gaps between the plates and the micas. Many of my NOS Sylvania and Philips JAN tubes have blue glow. The mica wafers in set of JAN 6L6GCs glow very brightly...first time I've seen the mica itself glow.

 

[riktw]

you have tubes with blue glass 😉
i made my ecc82 glow blue when i pushed them a bit to much.
about twice the max power rating, killed the tube after a while to, after becoming white hot
friend got kt88 running @ 430 volt, they get blue to, but 1 a bit less then the rest.

 

[Ty_Bower]

Long exposure shot of Russian 6P3S glowing nicely

Most impressive. I haven't been able to get that much out of my 6p3s-e, nor my Shuguang 6L6. As others have noted, plate voltage plays a big roll in getting a good blue, blue. Speaking of which, was that a John Valby reference made early in the thread?

 

[bigwill]

Most impressive. I haven't been able to get that much out of my 6p3s-e, nor my Shuguang 6L6. As others have noted, plate voltage plays a big roll in getting a good blue, blue.

Bear in mind that was a 64 second exposure, they look nowhere near that blue in real life. If you took a long exposure of yours I'm sure they would look just as bright!

 

[Wavebourn]

6P3S-E, 375V B+

 

[Matt BH]

I know they arent sweep tubes:

http://www5d.biglobe.ne.jp/~t-nakata/5B255M_amp/5B255MAmp.html

I can confirm that all the ones I have give a lovely blue glow on the glass. It must be something to do with the make up of the glass. Check this:

http://www.electricstuff.co.uk/geissler.html

I know Geissler tubes are full of gas but the glass plays a roll in the colour. How about some Valves made with Uranium glass