Tube Glow (Blue)

raps1514 · 316

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Offline raps1514

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on: February 16, 2025, 05:02:51 AM
Hello all,

I am new to tubes and have a general inquiry about tube glow. Both 2A3s on my amp appear to have a blue glow on the inner glass and bottom plate only really visible under low light conditions. How normal is this? Note: this is not a BH amp.

Thanks!

« Last Edit: February 16, 2025, 05:10:25 AM by raps1514 »


Offline Paul Birkeland

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Reply #1 on: February 16, 2025, 05:25:05 AM

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline 2wo

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Reply #2 on: February 16, 2025, 06:06:38 PM
It will go away, enjoy it while it lasts.

John S.

Offline raps1514

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Reply #3 on: February 17, 2025, 05:19:44 PM
Quote from: Paul Birkeland on February 16, 2025, 05:25:05 AM
https://www.jacmusic.com/techcorner/ARTICLES/English/blueglow/blueglow.html
There's lots of info here.
Certainly looks like 'Fluorescence Type 1' and decidedly...normal.


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