Question about Technics SUV500 2-Channel Amplifier

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Hi, My amp is a technics sua900mk2 when i have my volume at around the 10 o clock position, the amp cuts out and I have to turn it off and back on. it seems to be a common fault on this amp looking at the posts. Is there anything that might cause this that I can check myself. thanks

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  • Master
  • 8,546 Answers

Generally speaking, an amp protects 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 'naked'. 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.

This amp isn't a real powerhouse. Perhaps you're overdriving it. Exceeding it

Posted on Apr 06, 2011

Testimonial: "very helpful, as you said, I have since found a loose post at the speaker connection. problem solved, thank you very much"

  • 1 more comment 
  • brassic Apr 06, 2011

    im not sure how it will complete a circuit with no speakers conected,, the amp runs fine to a fairly loud level and will run all day until i just crank it that little bit more and its always the same place on the dial exactly. its not getting hot cos ive got the back off it andf its a fairl bit of power for its age, its 100 din per channel. i have 2 sets of speakers and its the same on each set and i have low loss wire so i know the cables fine. i will try what you say though as anythings worth a try, thanks,,,,Andy

  • brassic Apr 06, 2011

    Ive sorted it,, not quite sure what the problem was but im guesing resistance building up in the wires. All I did was take the speakers out to try what you said then put them back but tidied the wires up. The only difference is that the wires are not intertwined and tangled up now. Thanks again

  • David Dunn
    David Dunn Apr 06, 2011

    It may have been a loose wire, too. Vibration would cause its connection to vary and theapparent load to fluctuate. I think your amp is rated for 4-ohms but I wouldn't force the issue at its power limits.

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