JJ 6L6GC

[frankeg]

Hello folks,
I'm currently restoring a 1970 SF Twin and I replaced the power tubes with JJ 6L6GC's. This is my first 6L6 experience and I got concerned when I noticed an orange glow through the little window in the plates. All four tubes had this and I initially thought it was the screens but after checking the screen current which was 1.74 ma I relaxed. I then watched the tubes with the stand-by on and the glow was still there leading me to believe everything is normal. Not really knowing the internal structure/arrangement of this style tube, what exactly am I looking at through the plate window? thanks frankeg

[Jazz P Bass]

The heaters?

[frankeg]

Has to be I figure since they are the only thing powered with it in stand-by. I got worried after I read another post in this forum about screen grids glowing and I wasn't sure what I was looking at. Thanks for the reply...

[Jazz P Bass]

Here are some nice graphics of the internal construction of a Beam Tube (al 6L6) & a Pentode

[frankeg]

Thanks for the pics! Good detail. It does make me think that I'm seeing the cathode though. BTW, where's Wernersville?

[Jazz P Bass]

Wernersville, PA is on State Route 422, between Hershey (chocolate) & Philadelphia (Liberty Bell)
The Caron Foundation is right over the hill.
(Drunk tank for the stars)

[frankeg]

You're about 1 hr 20 mins from me then. Thanks for the help!