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This amp has always hummed, from day one. But now after it has warmed up the hum goes up and down which is annoying,is it worth keeping cost wise or shall I scrap it.This amp is ten years old but has'nt been used all the time,as I have other nad intergrated amps kind.
kind regards
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The hum of course is the 60 cycle line AC voltage. Make sure that the routing of the AC power plug is as distant as possible from the stereo RCA cables.
The most likely problem is the connection of the phono cartridge to the wires in the arm. These connections usually are silver plated and become oxidized creating a bad connection. Remove the cartridge and using a fine eraser polish the connections. There is a ground connection that makes the five wire connection. Be super carfull these terminals are very easy to break
The phono connections to the stereo is very low voltage subject to interference. The connection to the magnetic pickup at the tone arm is low impedance and is inductive. Any poor connection between the cartridge up to the AV316 will produce this hum. Continue to check connections and swap cables with a known good to resolve.
I have switched the left and right cables to ensure that the cable is not the problem.
Ref NAD C272 Power Amp
how do I connect a ground Wire to this Amp this amp has only got a 230 Bolt 2 Prong Plug. There is no 3 Rd Earth Prong .and when my amp is on get high pitch Noise on my speakers. I need to ground this amp how do I do this. Please Confirm
You have either got a bad earth connection, or possibily there's a capacitor failed.
If you can't find a dodgy conection, I would replace the large Electrolytic Capacitors in the power section, they are used to take out 50hz hum in the mains electric, when they go you get that hum coming into your system.
The AH may denote "slo-blo" style as opposed to Fast-acting A fast-acting fuse will look like a single strand of wire ( maybe wiggly looking) ..A Slo-blo will have an element in it and a spring
Please do not use a heavier fuse. The fuse is there to protect the unit from damage when there is a problem. Using a heavier fuse will most likely cause further damage. Since the problem seems to be intermittant, it can be a component that is beginning to break down or something as simple as a bad connection internally. If you have no experience working with electronics, I would not recommend you start here.
Something that would help a bit is to see if there is a pattern to when this problem occurs. For instance, does it seem to happen more when the unit is cold or warm? Does it happen more often after being run for a while? These are the subtle clues that will help to narrow down the source of the problem.
Please update this with any additional clues and I'll try to suggest possible fixes.
The buzzing is coming from the transformer. It is almost expected of an amplifier of this size, that the transformer (a large one) will excite the resonance of the casework and make some noise.
First,
Disconnect any input cables from the amp. Turn down the volume controls and disconnect the speakers. Power back on. If you still blow fuses with nothing hooked up, have the amp fixed.
If the fuse holds, shut down and connect the speakers, leaving the volume controls down. Power up and see if your fuse holds. If you have hum, an output transistor is most likely shorted. If you have no noise, SLOWLY turn up the volume controls and listen for the hum. If all is quiet, turn down the volume controls and connect your input cables and turn the volume back up. Noise? check your cables!
Mister Phil
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