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Meter lights How do I replace the meter lights on my power amplifier

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  • Graeme Ross
    Graeme Ross May 11, 2010

    depends on what type of meters are used. What sort of amp is it?

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There are lots of ways to light up a meter. Sometimes the lamp in accessible from the front of the meter, sometimes the back. Sometimes you have to remove the face off the meter itself. You can get most any replacement lamps to replace the blown one, Some solder in place, some screw in, some just clip in. If you can give me the make and model, I can give you more accurate advice.

regards
Graeme

Posted on Apr 01, 2008

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Old type amps or meters uses sort of back lighting only. it's either peanut type bulb or fuse like bulb. dpending on the voltagew requirement too, you may check one of the meters still lites working and see the specs of the bulb. it should no te hard to replace. it also runs on AC supply so no worry of wrong connection.

redrivera

Posted on Mar 25, 2008

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Apart from that other things to check are the power switch, to see if it works and the transformer.
It might be worth buying a cheap Ohm meter, if you haven't got one. You can check most of the parts in the power supply with it. By the way if the fuse has blown, buy a few as you might find it could blow again when you try it again. If it does you are looking at a device (such as a transistor) that as shorted and acting like it was a piece of wire. Which is easily found with an Ohm Meter!

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Don't forget to check for burnt or damaged parts too.

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Suspect an overload in either the power supply section or the devices on the main heat sink. In the power supply you are either looking at a transformer problem or semi-conductors associated with it. However since the clip and signal lights are on, I would go to the amp devices on the heat sink. If they are transistors test them with a Ohm Meter on the 1K setting in circuit even! You will soon notice which ones are gone! The meter will show like you had touch the test probes together!

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HI...
Are you talking about meter lamps?

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www.vintage-electronics.cc

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Steve,
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If you don't know what those components are, or how to use a volt/ohm meter, you should take it to a technician.

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In my experience fuses rarely blow due to age! I suspect that whatever the guy said the problem was it was really a faulty transistors or IC in the power amp board.
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Hi and welcome to FixYa,

I have to agree with you that that component is a thermal fuse. In my country, they are readily available in most electronics/hobbyist parts store. These components are also used for small motors and therefore would also be available in some (but not all) kitchen appliances parts stores. A temporary workaround is to install an ordinary fast blow fuse.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

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80% of the time output transistor burn and blow the fuse.
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