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JCM800 with piercing highs? Tube problem?

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  • #1

    JCM800 with piercing highs? Tube problem?

    My 4010 combo was unreasonably shrill last night for some reason. Can tubes cause this? It didn't sound broken, just ice-pickish no matter how I set the low/mid/high. I ended up using an eq pedal and cutting all the highs.

    Any ideas? It seems like it has been getting that way over the last couple of weeks, the more I play (warms up), the less lows/mids come through. I also played about 4 hours and it seemed to get worse by the end of the night.
    When you take a shower in space, you have to press the water onto your body to clean yourself, and then you gotta vacuum it off. - Ace Frehley
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  • #2
    Re: JCM800 with piercing highs? Tube problem?

    change the v1 preamp tube, maybe it's going bad.
    other than that, the filter caps might be about to die. kinda likely actually...

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    • #3
      Re: JCM800 with piercing highs? Tube problem?

      I never have had piercing highs before from filter caps, from caps, it's been like, a couple guitars playing out of tune sounding.

      The 1st position pre amp tube, could be microphonic, however, it's like, it would do it almost all of the time I would think, since they don't really get hot.

      Your power tubes could be to blame, because you mention lows/mids don't come through. I've had bad power tubes that made the sounds, really tubby and woofy.

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      • #4
        Re: JCM800 with piercing highs? Tube problem?

        I had a '80 JMP master lead mkII (same circuit at jcm800 I'm told), it was so bright, I alwasy ran the high control knob all the way down.
        Was it a strange room w/ a lot of hard walls?, electrical current can affect your tone too. Maybe mine had something wrong w/ it, -same as yours?, I just assumed that's the way it was.

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        • #5
          Re: JCM800 with piercing highs? Tube problem?

          It was a new room to me this last time. I am going to start with the V1 tube, then do the whole thing tube-wise. If that doesn't help, it's off to tech-land.

          It had new LCR filter caps 4-5years ago, but ya never know.....
          When you take a shower in space, you have to press the water onto your body to clean yourself, and then you gotta vacuum it off. - Ace Frehley

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          • #6
            Re: JCM800 with piercing highs? Tube problem?

            "It had new LCR filter caps 4-5years ago, but ya never know....."
            ok, then the filter caps shouldn't be the culprit. i thought you never replaced them, and after all it's a 20yr old amp [img]/images/graemlins/wink.gif[/img]

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