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Thread: Vox AC30CC2 mutes on low signal (especially AC30CC2X with blue speaker) problem

  1. #1
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    Vox AC30CC2 mutes on low signal (especially AC30CC2X with blue speaker) problem

    Hello,

    I've bought a nearly new AC30CC2X with stock tubes. There is a problem that when the input signal gets lower (e.g. playing soft notes) the amp mutes completly after few seconds. If I hit the guitar hard again hard (large signal input) the amp plays again.

    I found out that the send channel with a second amp is ok, so the problem must be after the receive input (e.g. power section) and not in the preamp section.

    It is equipped with the following tubes:
    1x: 5AR4 SOVTEK (R) MADE IN RUSSIA 0803
    3x: 12AX7WC Sovtek (R) Made in Russia 07 09
    4x: EL84EH electro harmonix Made in Russia 08 05

    Any ideas?

    Thnx.

    Wiesl

  2. #2
    Supporting Member Chuck H's Avatar
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    It doesn't sound like anything a tube would do. There may be some sort of noise gate built into the circuit? Maybe the bias is hinky on one of the opamps? A lot of silicootie tech is beyond me though. Here's a link to the schematic to make it easier for others that might take a look.

    http://bmamps.com/Schematics/vox/Vox...2005)%20SM.pdf
    "I've heard magic defined as "a technology you don't understand". By that aphorism, the folks in this forum are practicing wizards, able to summon AND control the lightning demon, and make charms to allow others to use the demon in certain ways." R.G.

    "...less ear-friendly but handy for jazz." Leo_Gnardo

  3. #3
    Senior Member Regis's Avatar
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    Theres a switch on the back to deactivate the effects loop. Try switching it back and forth a couple of times, then put it in bypass mode, and check the amp again. Also check the speaker leads and make sure everything is tight. Maybe try another speaker lead temporarily to see if anything is screwy with the original.

  4. #4
    Supporting Member Jazz P Bass's Avatar
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    Holy Moly!
    How's it been Regis?

    Have not heard from you in a coons age.
    pdf64, Justin Thomas and g1 like this.

  5. #5
    g1
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    don't forget the joker g1's Avatar
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    I was thinking the same, good to see you back!
    Justin Thomas likes this.
    Quote Originally Posted by Justin Thomas View Post
    In my ideal world, I'm not too loud - your room is too small!

  6. #6
    Senior Member Regis's Avatar
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    Hi guys,
    Thanks for your kindness. I had a pretty busy year in 2016. I rekindled a relationship with a lady I was with back in the early ninties and we're doing well, gonna get married sometime this year.

    I haven't been playing much or doing any amp stuff though. She fully supports both for me, she's a great lady.

    My workshop was in such disarray I started a remodel, and when finished I'll heat up the soldering iron again.

    Thanks

    Regis

  7. #7
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    Quote Originally Posted by Regis View Post
    I haven't been playing much or doing any amp stuff though.
    Wimmin will do that Congratulations
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  8. #8
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    That's great news, I was concerned that the long silence following your health issues wasn't a good omen

  9. #9
    Supporting Member Chuck H's Avatar
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    I bet he bought new pants.

    I say that because back in my band days I came to practice in new pants once. My vocalist asked me if I'd met someone. I had. He said that new pants were a dead giveaway
    pdf64, Justin Thomas, g1 and 1 others like this.
    "I've heard magic defined as "a technology you don't understand". By that aphorism, the folks in this forum are practicing wizards, able to summon AND control the lightning demon, and make charms to allow others to use the demon in certain ways." R.G.

    "...less ear-friendly but handy for jazz." Leo_Gnardo

  10. #10
    Supporting Member The Dude's Avatar
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    Only a vocalist would notice new pants.
    “Yeah, well, you know, that’s just, like, your opinion, man.”

  11. #11
    Senior Member Regis's Avatar
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    Quote Originally Posted by Chuck H View Post
    I bet he bought new pants.

    I say that because back in my band days I came to practice in new pants once. My vocalist asked me if I'd met someone. I had. He said that new pants were a dead giveaway
    No, she bought me new pants. And shirts. And socks. And art for the walls, rugs for the floor, and lamps for the end tables she brought over.

    Also I can't walk around in my underwear, leave my socks on the floor, or look at naked women on the internet anymore.

  12. #12
    Supporting Member Chuck H's Avatar
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    Fair trade
    pdf64 likes this.
    "I've heard magic defined as "a technology you don't understand". By that aphorism, the folks in this forum are practicing wizards, able to summon AND control the lightning demon, and make charms to allow others to use the demon in certain ways." R.G.

    "...less ear-friendly but handy for jazz." Leo_Gnardo

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