Please help!

lalosglalosg
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    lalosg
    hi, i usually come to the board to read and learn the most i can, but now i have a problem with my amp, i have a 6505+, today when i was about to start practice with my friends, i turned on the power switch, everything was ok, but when i turned on the stand by switch, i smelled something burning i took a look at the tubes and they looked like the normal orange but around them was a blue color, i got scared i thought the amp was on fire, well maybe it was :p i didnt turned the amp on again at my friends house, i brought it to my house and try it again and the same thing happened. just want to know if this had ever happened to one of you guys, i appreciate any thoughts. Saludos desde Monterrey Mexico :D
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    Yo Daddy
    Yo Daddy wrote

    Hey man! Welcome!

    Swap them tubes out. This hasn't happened to me before but if I saw my tubes fryin' like that, I'd have to buy new ones anyways.

    Sorry it's not much help but good luck in finding out what happened.

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      lalosg
      lalosg wrote

      thanks, ill try that, ill buy new tubes as soon as i get a chance to go to texas, any suggestion about what tubes to buy? or should i use the same brand, i love the sound of my amp, its nothing like ive ever heard around here, but i know it could get better, thanks again.

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        gorsch
        gorsch wrote

        My singer owns a powerball thats not working so well right now. I get it working, then I get to use it. It powers up, tubes seem to look like they're fine, both pre and power. He says it gets a clean signal but not much gain on the dirty channels. Which is why I know somethings wrong. I still have to mess with it to try and pinpoint what the issue is. I'm thinking pre amp tubes because it powers on fine and he gets a clean channel but no distortion. None of the power tube "monitor lights" come on though, which would tell me it could be power tubes but they're glowing a nice Blue/orange color. The normal color. Like I said I still have to check it out for myself. I've been using tube amps forever now so I know the basics on changing tubes, replacing low gain with high gain or vise-versa and so on.............
        One question is can anyone recommend some good pre-amp and power tubes for it? I'm not going to pay more for "Engl" labeled tubes because thats dumb. The pre's are ECC83's right? Could I still use Tung Sol 12ax7's and a couple of other 12ax7's. I usually use a mix of 12ax7's for most my amps.
        I just know an ecc83 is slightly different, but would 12ax7 harm it or make it sound bad?
        Also, does anyone have an Idea based on the little info I gave as to whats causing this problem?

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          Yo Daddy
          Yo Daddy wrote

          If you like what you got, why change?

          There are several fellas around here that are real tube geeks and know wtf they're talking about. Hopefully one of 'em could pipe in? I'll have to check what Jaffis put in the 5150 II that he sold me. Chevy knows his shit too so maybe he can help.

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            guitarsatbmusic
            guitarsatbmusic wrote

            You may want to get a tech to check it out first before blowing coin on new tubes to fry them too. Screen grid resistors take the load when a tube fails but can also fail themselves whilst doing so. Replacing the tube will just result in another fried tube and no protection from the failed screen grid resistor. Having a failed SGR is like having no tune in the socket at all basically.

            P.S. Disclaimer: Amplifiers carry lethal votages (that means they can kill), plugged in or not. If you are not proficient in electronics servicing and safety do NOT attempt to poke around inside your amp.

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