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Post subject: Tube life on a new Blues Jr.?
Posted: Fri Jul 20, 2007 2:30 pm
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Is it correct that the average tube life for a Blues Jr. is just about 6 months?

B.


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Posted: Fri Jul 20, 2007 2:33 pm
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Several factors come into play, how often you play it, and how loud you play it are a couple of them.

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Posted: Fri Jul 20, 2007 4:08 pm
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Blues Juniors eat output tubes because they, like Pro Juniors, are biased very hot. The tubes can take it, but if you play it regularly, a couple of hours per day, several days per week, you'll go through the tubes pretty quickly.

With the hot bias, how loud you play doesn't have that much effect because it's like your engine is running at high speed all the time instead of dropping back to idle.

If you can solder, you can change a single resistor and it will run much cooler--and sound better, in my book.


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Posted: Fri Jul 20, 2007 4:12 pm
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I have had the same NOS tubes in my Blues Jr for well over a year. I play it a couple of hours at a time several days a week.

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Posted: Fri Jul 20, 2007 5:24 pm
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My BJ gets played only occasionally, as I now have 7 or 8 amps, but for the first couple of years I had it, it was my only amp (I was only a bedroom player then). It still has the original tubes from when I bought it in 1998.

Maybe I'm overdue! Maybe I should do a preemptive tube change!


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Posted: Mon Jul 23, 2007 4:34 pm
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I've been unhappy with the sound of my BJr. for the past few weeks. It just came to me that I still have the original EL-84's in it! I guess that they're about 3 years old... no wonder the amp sounds "blah".

I do have a set of JJ's I can put in. I bought them about a year and a half ago but found that they ran hotter than the stock tubes, so I pulled them out. These have a rating of "28" (?), but I'm sure they'll be fine until I can order another set of lower rated tubes.


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