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Re: AMP FREAKS OUT [message #9534 is a reply to message #9529] |
Thu, 09 February 2006 12:18 |
Aki
Messages: 36 Registered: May 2009
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Baron |
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Well, since my alter ego is a wailing blues guitar player, let me see if I can jump in and help on this one. It's difficult to tell remotely, but it does sounds like you ran into a bad tube. But since the tube worked for some time, it's somewhat possible that somehow your replacement tube didn't make good contact in the socket or some other odd thing went wrong. As for output tube re-bias, you don't need to do it unless you change the output tubes so you are OK there. You should be able to get a replacement 12AX7 at the store where you got it from. Typical guitar stores wouldn't have the equipment to test tubes (a number of them orders from people like me), and big franchises, as you know, couldn't care less. But if it's a friendly shop, you might be able to get them to try the replacement tube in their house amp for a while. At least that'll give you some level of comfort. If this problem does happen again with another replacement, I'd take the amp into a tech though. Aki
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Re: AMP FREAKS OUT [message #9536 is a reply to message #9535] |
Thu, 09 February 2006 23:46 |
blades976
Messages: 20 Registered: May 2009
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Chancellor |
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It's no big deal as long as the amp didn't fry. $20 is a cheap lesson to learn all things considered. I'll be ordering a tube from Aki on payday and hope to have better results from somebody who specializes in tubes. It’s amazing the difference the tubes make though. When the amp freaked out I plugged in the bass via the effect peddle to the board. Nice and clean but no balls. I'm starting to see why tube heads are so obsessed with the sound of tube amps. John
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Re: AMP FREAKS OUT [message #9537 is a reply to message #9529] |
Thu, 09 February 2006 12:18 |
Aki
Messages: 36 Registered: May 2009
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Baron |
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Well, since my alter ego is a wailing blues guitar player, let me see if I can jump in and help on this one. It's difficult to tell remotely, but it does sounds like you ran into a bad tube. But since the tube worked for some time, it's somewhat possible that somehow your replacement tube didn't make good contact in the socket or some other odd thing went wrong. As for output tube re-bias, you don't need to do it unless you change the output tubes so you are OK there. You should be able to get a replacement 12AX7 at the store where you got it from. Typical guitar stores wouldn't have the equipment to test tubes (a number of them orders from people like me), and big franchises, as you know, couldn't care less. But if it's a friendly shop, you might be able to get them to try the replacement tube in their house amp for a while. At least that'll give you some level of comfort. If this problem does happen again with another replacement, I'd take the amp into a tech though. Aki
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Re: AMP FREAKS OUT [message #9538 is a reply to message #9534] |
Fri, 10 February 2006 00:02 |
blades976
Messages: 20 Registered: May 2009
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Chancellor |
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I think the tube had good contact. When I replaced the tube I also had to undo and re-attach an "arm" that put downward pressure on the top of the tube effectively holding it in place. The amp is solid state; the only tube in it is the one pre amp tube, hence my assumption to re-bias it. I'm a bit sketchy on the idea of going back to the shop. Its one of those guitar shops with used gear that’s WAY too old and beat up. I'm willing to cut my losses at $20 for the tube and be grateful the amp didn't permanently roast. I'll try order another replacement from a specialist (I’ve heard of this company named BOI AudioWorks…) and not chance smoking a bass amp in order to save $2-3. I have my eye on the 12AX7EH-GOLD you stock. I'm hoping it will fill the bill. Clean is what I am looking for. John
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Re: 12AX7EH-GOLD [message #9558 is a reply to message #9549] |
Thu, 16 February 2006 13:48 |
blades976
Messages: 20 Registered: May 2009
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Chancellor |
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The new tube is in and everything is working out great so far. The hiss is reduced although not gone (to be expected from tubes anyway) and the amp hasn't pitched a fit. No critical listening done yet though to compare the new tube to the old as last night's practice was kind of nuts with an extra guitarist, a drum machine, and a keyboard along with the regular band. Translation, it was loud as hell. Hopefully next practice will be a bit more subdued and I can get some critical listening done with the new tube sound. John
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