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Post by benallison on Aug 6, 2007 9:54:09 GMT -7
So, turned on my amp, walked away, came back, and it's dead. No jewel light, no nothing.
I'm waiting for replacement fuses to come, but was wondering:
Should the jewel light come on, even if a tube is blown (power tube or rectifier tube)?
I'm not to well versed on how tubes interact with the entire power scheme of an amp.
From what I've read, a blown fuse can be cause by a faulty rectifier tube. How do I ultimately determine that tube is kaput? Will it rattle if i tap it (like a light bulb). Do I need to take some sort of power reading? Will, the jewele light of the amp in fact not turn on?
Any help would be greatly appreciated!
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Post by benttop (Steve) on Aug 6, 2007 10:40:30 GMT -7
So, turned on my amp, walked away, came back, and it's dead. No jewel light, no nothing. I'm waiting for replacement fuses to come, but was wondering: Should the jewel light come on, even if a tube is blown (power tube or rectifier tube)? I'm not to well versed on how tubes interact with the entire power scheme of an amp. From what I've read, a blown fuse can be cause by a faulty rectifier tube. How do I ultimately determine that tube is kaput? Will it rattle if i tap it (like a light bulb). Do I need to take some sort of power reading? Will, the jewele light of the amp in fact not turn on? Any help would be greatly appreciated! You can't "see" or otherwise detect that a tube is bad unless you have a tube tester or know where you might access one. But it sounds as if your main fuse popped. That can happen when a rectifier tube shorts, but it can happen for a zillion other reasons too. Well, a dozen or so anyway. Most often it is the rectifier tube though. When that fuse pops, all power is interrupted coming in to the amp, which is why the jewel light is not illuminated. It doesn't sound like you're very comfortable with this stuff. You might be a lot smarter to take the amp to a good tech, or send it back to the factory. Just putting a new fuse in there isn't likely to solve your problem - whatever caused the first fuse to pop is still waiting there for the next fuse. That needs to be corrected or you're just wasting time and fuses. As I said, it's probably the rectifier, but your output tubes can cause this behavior too. As can a power supply problem, or other causes. If you're not up to troubleshooting this stuff, a tech is the best course of action. There are lethal voltages present inside the amp, so if you decide to pull the chassis, be forwarned that you can kill yourself, quite literally, by poking around in there. Let's be careful out there!
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Post by nitehawk55 on Aug 6, 2007 13:52:56 GMT -7
Try a different known good rectifier tube first . Most likely your problem but if fuse pops again right away seek help .
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