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Tubes do glow, but typically 12Ax7's aren't known to glow more than a dull penlight.
At some point in time it would probably be a good idea to spend the 10-20 on a quality 12ax7. While 12ax7's are pretty durable and last a long time...they do wear down or crap out in time.
Check out Pete's (Twisteramps) comments regarding tubes in the beginning of this topic, some useful info. Sovtek has alot of vaiety, Electro Harmonix, Tesla/JJ, Chinese Ruby, and of course all the euro brands like Mullard, Valvo, Brimar Siemans, Miniwatt then USA RCA, etc...
It doing it again, but now it's only if I touch the amp after turning it on.
I had a small Laney though the FX send and there was no crackling. I then had some headphones hooked up to the headphone jack and again, no crackling.
It seems that it only crackles when the speaker is plugged in, so I guess I'll have to replace it. Or perhaps the speaker jacks (both of them [img]images/icons/shocked.gif[/img] ) are faulty.
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