Tube amp with no sound coming out :(

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Symphosomatic, Jun 5, 2006.


  1. Symphosomatic

    Symphosomatic Member

    Messages:
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    May 13, 2006
    Location:
    Toronto, ON
    Hello all,

    Anyone have any ideas on the following:

    I had a tube amp shipped and when it arrived it doesn't produce any sound. It turns on and the tubes glow but there's no sound. It doesn't look damaged in any way.

    Any thoughts?

    Thanks!

    Adam
     
  2. donnyjaguar

    donnyjaguar Member

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    Location:
    Canada
    Not trying to be funny but have you checked the following:

    - speaker attached properly in "main speaker" socket?
    - tone controls not all on zero
    - not switched to standby
    - wire hasn't fallen off speaker lug during transit

    Let's rule those out first and then go from there.
     
  3. Symphosomatic

    Symphosomatic Member

    Messages:
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    Joined:
    May 13, 2006
    Location:
    Toronto, ON
    Everything seems to be in order.

    I may have to take it in to the shop. :eek:

    Cheers,

    Adam
     
  4. mavrick10_2000

    mavrick10_2000 Member

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    Location:
    Oklahoma
    What brand of Amp? Also does it have an effects loop? Were the tubes shipped, packed separately?
     
  5. K-man

    K-man Member

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    I would check the tubes first. Replace them with some known good ones.
     
  6. trdlasvegas

    trdlasvegas Member

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    Location:
    Las Vegas
    The tubes glowing ONLY means the 6.3VAC heater voltage is on. Depending on the amp their may be another fuse for the High Voltage (HT).
    You may want to check ALL the fuses first.

    -Tony
     
  7. Reeek

    Reeek Member

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    Location:
    Reno, NV
    As stated already:

    Assuming the speaker connections are good . . .

    Fuses - Ther may be multiple fuses including some inside the chassis
    Preamp tubes next - They need to pre-amplify
    Power tubes

    What amp is it and why was it "shipped"?
     
  8. Symphosomatic

    Symphosomatic Member

    Messages:
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    May 13, 2006
    Location:
    Toronto, ON
    Thanks for the advice guys!

    I'll check the fuses and then change the tubes if need be.

    It's a Bad Cat and was shipped because I just purchased it from a distance. The tubes were in place during shipping. It was packed well though.

    Cheers,

    Adam
     
  9. sysexguy

    sysexguy Member

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    Location:
    St-Sauveur, QC Canada
    If it has an effect loop, the switching jack that bypasses the loop may simply have to be cleaned. Simply test, plug a cable from send to return. If that works, you've found the problem. You can also try plugging the guitar right into "return" but you'll likely need another cable to plug into the send just to activate the return. If that works, you know your power section is ok and it's most likely a preamp tube. If you don't have an effect loop, you could try taking the reverb (assuming you got one) pan return plug and tapping it with your finger....(with reverb "on" and turned up")...if you hear that, you have an OK power section. That's about all I can think of without breaking out the tool box.

    Andy
     

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