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My laney aor series amp has completely stoped working, the valves are still glowing but no sound is coming out

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  • Anonymous Apr 08, 2009

    hi...same prob i have tt50 combo 1x12.
    no sound...all tubes light up...and i had a repairman look at it.
    he couldnt find anything wrong ...except...lol...no sound...the fuses are good ...and were even replaced...cant find prob..any known issues? or something else to check?

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  • Master
  • 1,512 Answers

Hi.

Have you checked the HT fuse. the amp has 2 power supplies, one for the tube heaters, and another for the actual operation of the amp. Check that fuse, and replace with exactly the same type if blown. If it keeps blowing fuses, then you may well need to change your output tubes. They don't last forever, and you will get about 6 months out of them in normal gigging/rehearsal use, longer if you don't use the rig at high levels. Be sure also to use a proper speaker lead, not just an instrument patch lead, poor connectivity from anything that is not heavy duty can cause your amp to blow fuses, AND pop valves. I am happy to talk more to you about it, I have had a long love affair with valve amplifiers, both building and repairing them.

regards
robotek

Posted on Nov 09, 2008

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that means that your amp is taking its sweet time going completely down the tubes(so to speak)...had it for a while?

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It seams like the amplifer is not working and you are right but it certanly needs to be measured first.

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I have a Pioneer vsx-5600 and it worked awsomely, then one day i turned it on and it stoped putting out sound, every thing still came on just no sound...checked the fuses an their still good...dont know...


Try getting into the test tones routine and see if that verifies the hardware works. If so you have a switch out of position (mute, tape, multichannel analog...).

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

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I have a denon avr 2308. The sound stoped working


when using an hdmi input, make sure the "input mode" is in 'hdmi' or 'auto'. i am sure you can remedy your issues with a trip through the setup menu. it very extensive. good luck

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Hi there, My 50 watt MG series marshall amp keeps making a loud rattling sound when its turned up loud. Any ideas why this is and how i could fix it? Ashley Fields e-mail: ashley_ibanez@yahoo.co.uk


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I am working on a Peavey Classic 30 amplifier. It is completely dead, no sound. All the tubes light up. The 12ax7 tubes don't seem to glow as bright as the L84 power tubes.


Hi directmusic

You can get a circuit diagram from here.

The 12ax7's will not glow as bright as the EL34's . Is just the nature of the tubes. The latter being higher powered and the 12ax7 low power. The EL84's as output tubes will always glow brighter, and often even with a dull blue glow about the plates from the higher voltages made available to them. If the plates them selves are glowing red(inside the EL34's). then you have a bias problem. Be careful running the amp in this condition. Do some static checks with the amp off looking for failed components about the bias and screen control stages. .

Start by checking all the DC voltages first. The circuit diagram i supplied the link for has voltages marked for you to check. A common problem with this amp is the 390 ohm 5 watt resistor going open. A faulty output tube(s) may also have caused this. I would replace the output tubes anyways for a good repair.

I am more than happy to answer any other questions you may have about it, just give me a hoy :) Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek





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Use this with music, and use the 5.1 with movies to get a better experience from your amp.
The sub will work in 5.1 but doesn't show up in the display. Try movies with loud sounds.
Most of the pre-set sound fields are of no use to me. I only use normal surround, and AFD and love it. I hope this works for you!
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