#1
I'm pretty new to tube/valve amps.

I was just wondering how you know if a tube has blown or if it is a crap one, like what are you listening for or does it still make a sound? etc

cheers
Dancing In Your Dust
#2
Your sound will become pretty crap, and it will probably have a black spot on it and it may not be glowing orange as usual (although I hear blue is okay too).
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#3
i'm wondering if my second preamp tube is dodgy coz when i turn the gain up half way it gets very fuzzy
Dancing In Your Dust
#4
I have been wondering the same with the tubes in my amp. I have a 6505+ so I know that generally it is pretty noisey, but I can hear kind of a high pitched hiss now, is this normal?
Peavey 6505+
Marshall Jcm-900 Lead 1960 cab
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#5
Quote by cbehrendt
I have been wondering the same with the tubes in my amp. I have a 6505+ so I know that generally it is pretty noisey, but I can hear kind of a high pitched hiss now, is this normal?


I think that might mean that the vacuum has been broken in which case you'd need a new tube.
#6
See how the tubes are glowing. If one looks different from all the others, its clearly not functioning properly.
WTLTL 2011
#7
just replace all of them if its been a long time (over 2 years) since you bought the amp, or if you bought it used then definitely replace all of them.
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