[fraseyboy]

I just took my tubes out for the first time in a while to adjust the gain on my LD MK2 and I noticed this:

It appears to be some sort of baked on somethingness. It's quite hard and can't really be scratched off. On both tubes it appears only on the side which is facing the hottest part of the amp (the big power thing at the back).

Anyone know what it is and whether it's affecting the sound?

 

[Bullseye]

Don't touch the tubes whilst eating chocolate

So you say it is only at the part of the tube that is close to the metal cube behind the tubes, no? It just seems something was burnt. Maybe something fell on top of it and it got burnt. If you see both tubes have different markings.

Anyone else with the Mk2 reports the same?

 

[Uncle Erik]

Was there tape or a label on the tubes when you got them? Some of the sticky part might have been left behind, then congealed with dust and baked on over time.

I'd take it off with a razor blade and/or mineral spirits, denatured alcohol or acetone. Those usually take gunk right off. They won't hurt the tubes.

 

[fraseyboy]

I don't think there were any stickers...

I'll try removing it the way you describe. I'm probably due for new tubes anyway, since these were the cheap chinese ones that came with the LD MK 2.

Is mineral spirits the same as methylated spirits?

 

[sunneebear]

Eww! This is a public forum.

Your tubes may not have been as faithful to the LDs.

 

[Max F]

Mystery of the bloody tubes.

Time to call the Hardee Boys.

 

[Happy Camper]

Looks like flux resin. Are the tubes inside the body of the amp? It might be something touching the tubes and have melted (like wire insulation or transformer varnish). Maybe blood?

 

[Uncle Erik]

Quote:

Originally Posted by fraseyboy /img/forum/go_quote.gif Is mineral spirits the same as methylated spirits?

No, mineral spirits are like turpentine or paint thinner. Methylated spirits are the same as denatured alcohol. Either should work, though. If there's any nail polish remover around, that should also work.

 

[aamefford]

If you have children that might explain it. I have a 4 year old, and I find the strangest things...