Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

tube color when warm turns Blue (SOLVED)
#1

I have a 6k6GT that when i turn my radio on, it emits a sorta neon looking blue color.

the 6k6's are different brands.
i have the original totally blacked out philco 6k6's which are good put back as spare.

 I have 220degF on one 6k6, i have 245degF on the one that goes blue looking.

i moved the two 6k6's and it is infact the tube turning blue and not something about the circuit feeding it.

is this ok?

if so, how do i get more of these tubes that go blue?  looks really nice
#2

The blue tube is probably gassy and no good if the blue glow fills the space inside the tube. That means air has leaked inside and contaminated the vacuum. The fact that the blue tube is getting hotter is not a good sign.

If the blue glow is on part of the inside of the glass surface only and not filling the space then it is just harmless florescence caused by stray electrons hitting the glass.

If there is any doubt, replace the blue tube because a gassy one can go into a runaway condition where the current keeps rising until something eventually burns up.
#3

its blue along the exterior of the glass, not in the central areas where the orange glow is happening.

its like a halo of blue so to speak ...

what say you?
#4

If its only along the surface of the glass then its probably ok. If you have a glow around the actual tube elements then that's a problem.

I would still monitor the temperature of the tube and make sure it does not keep increasing after its been on for a while.
#5

thanks,, this is a new old stock tube i got from Gary up in ohio,,
i will order another.
I dont want to use my original Philco tubes ,, all of them were good except 1 and would like to save them back as spares.
#6

Sometimes the flourescence will "dance" to the music in an audio amp. As stated, if it's probably gassy, even NOS tubes can get this way. I've heard about running 'em for a while can sometimes clear up some gas to the degree possiible with the internal getter. I can recall an ancient Eico that did this. The 6L6's lasted for years!
#7

here is a picture of the tube
two 6k6's side by side from left to right.

to the far right is my rectifier tube


Attached Files Image(s)
   




Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
An attempt to remove the Field Coil from a G speaker
Paul, thanks, Anything can help. Gary Thanks, lemme look! PS. Looked it up. They have kits and parts for mod...morzh — 02:45 PM
An attempt to remove the Field Coil from a G speaker
Paul, thanks, Anything can help. Gary Thanks, lemme look!morzh — 02:39 PM
46-1201 Trip Switch Spring
I deleted the other thread, as it was duplicate and did not have the photo. Please proceed with this one.morzh — 02:37 PM
46-1201 Trip Switch Spring
Hello, first post here, bear with me. I've been electronically refurbishing a 46-1201 that I received from a relative. ...ConcernedFeller — 01:46 PM
An attempt to remove the Field Coil from a G speaker
I am late to this post, amazing amount of work for a speaker Mike. You must like the challenge. I have a speaker from an...Paul Philco322 — 01:04 PM
An attempt to remove the Field Coil from a G speaker
Mike, give this site a look for your spider. Can't hurt. Take care and BE HEALTHY! -GaryGarySP — 12:41 PM
An attempt to remove the Field Coil from a G speaker
Rod, Bubble packaging? The one I know (if you mean the large bubble type) is really thin. I have some at home. Is there...morzh — 12:23 PM
An attempt to remove the Field Coil from a G speaker
Q8. What's the meaning of life? I have read that someone made a spider out of the clear plastic from bubble packagin...RodB — 11:07 AM
An attempt to remove the Field Coil from a G speaker
So, Q1. Does anyone know where to get the spider. Q2. If there is no such place, what material is best? I doubt tin is...morzh — 09:43 PM
An attempt to remove the Field Coil from a G speaker
Arran The oxidation seems to go deep, a few layers. The break starts right there, but then it will occur on every la...morzh — 07:35 PM

[-]
Who's Online
There are currently no members online.

>