#1
Well, it kept blowing fuses, so I took it to a shop to get it repaired. They thought they fixed it, so they put new tubes in it, and it burned them out/blew them up/whatever it is that happens when a tube gets overloaded. They double checked everything and found nothing obviously wrong, so they put some NOS tubes in it and it worked fine. I didn't want to pay for NOS tubes, though, so they put some new ones in...and they blew up!

The only explanation I can think of for this is that there's something that's sending too much current to the tubes, and the NOS one have a higher tolerance or whatever so they can handle it, but the new ones can't. I would only expect that to happen with low-quality tubes, though, which I'm pretty sure they weren't using.

Has anyone even heard of anything like this? Any idea what might cause it?
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Last edited by Missingno476 at Mar 25, 2008,
#2
Did they re-bias the amp to hot?
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#3
Quote by SSL27
Did they re-bias the amp to hot?

I'm pretty sure they didn't, if anything they probably biased it cooler.
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#4
Could the transformer, or something else effecting the voltage hitting the tubes, be going crazy? I'm really kind of at the end of my wits on this, I really need to get this amp working.
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#5
well, transformers change voltage level, so it may be that. That's what I can think of.
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#6
Maybe the tubes they were using were just rebranded tubes?
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#7
honestly you should try a different shop, if they continually unsecsessfully repair it, its time to move on
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#8
Did they even check your tube plate + grid voltages?

Which valves was it blowing, all of them? Power? Preamp?
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#9
Different amp tech. Sounds like a wacky output transformer. But could be other things.
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#10
6505's/5150's are fixed bias amps. It will be something else but im not sure what
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#11
Quote by AdRev
6505's/5150's are fixed bias amps. It will be something else but im not sure what


Fixed bias doesn't mean it couldn't be blowing tubes due to a hot bias. It just means peavey didn't put anything in there to make it easier to bias the tubes.
#12
Why do they think just because its fixed bias it can,t be changed?
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#13
Whoa whoa...

How come no one suggested this shop selling him up?

Is it you personally that is "blowing" the tubes, or is the store just telling you they are blowing up?
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