Cursing bad luck: One of the preamp tubes in my Peavey Classic 30 seemed to peter out during practice yesterday. Two hours before my first concert of the year. An awesome friend came in in the clutch, but now I'm puzzled as to what to do. (and have another show on Thursday)
So, playing. It was turned fairly high up (Pre at 6-7, Post at 6-7) (note that the scale is 1 to 12). I'm playing fairly loud (with a drummer, and a loop being sent to it), and within a few seconds I lose volume. We all stop, I look at the back of the amp, and one of the three preamp tubes is not showing its beautiful glow. Playing yields a barely audible, really sad sounding chime.
So, I live with it. The weird part is that today, I remembered that perhaps the other channel on the amp is usable (I think I'm incorrect in thinking this, because it isn't a 'true' two-channel amp) Anyway, the amp seems to work, although that tube still isn't glowing. I'm afraid to test it thoroughly, because I keep reading horror stories of this sort of thing (and I've seem some scary stuff happen with vacuum tubes in a photography setting).
So, wtf do I do? I'm thinking I should retube it, and Eurotubes
is insanely hyped
. At $61 for a retube of 7 tubes (my amp has 4 post, 3 pre), average price seems to be pretty good relative to other shops. And they can deliver in three days.
Or should I just buy one tube? Or am I set to go with this weirdly-working setup?
I'm disregarding bias for the time being because the C30 uses EL84s which supposedly don't need to be biased. But the thing is, I only have had the amp for about 6 months, and it was brand new. So, WTF? Tubes are supposedly usable for years on end, and these only lasted a half. Am I running the preamp too high? is there anything else that could have caused this (fuses?) that I'm not looking at?
Thanks for any guidance.