NAD 3020 Switch On Power Thud Sound Issue Repair

NAD 3020 Switch On Power Thud Sound Issue Repair - Retfurb Retro Audio

Рет қаралды 1,765

17 күн бұрын

In this video we have a NAD 3020 Stereo amplifier, Which has an issue when powering up the unit.
The system has a loud long thud / bang sound, As soon as the power is put through the device.
It is only when turning on the unit and does not happen when powering down.
The system does contain a muting circuit on power up, So hopefully this is all that needs repairing at......
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The NAD 3020 line of amplifiers, Is widely regarded as one of the all time greats. It was a giant killer in the day and still holds its own today.
It is a great sounding amplifier and for the original retail price it is hard to beat.
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Links to our other NAD videos:
NAD 3020A Facia panel refurb - • NAD 3020 A Amplifier F...
NAD 3020A Front control repairs & strip down - • NAD 3020 A Amplifier T...
NAD 3020A Re-Cap • Replacing Old Electrol...
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About Retfurb.
On the channel we will be looking at all things Retro, Vintage & collectable. Along the way we will be carrying out various tasks including; refurbishments, repair, servicing, strip downs, restorations and much more. We aim to bring out new videos at least once a week, But will aim to release new videos more regularly.
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Thank you for visiting our channel.
Retfurb
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Warning
All of our videos are intended for entertainment purposes only.
Any tasks we show on our videos, should be carried out by qualified persons only. All of the repairs, refurbs, modifications, etc can be hazardous to health. We ensure all safety precautions are carried out first, Before attempting any repairs.
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Music made using: Bandlab

Пікірлер: 22

@don7680 13 күн бұрын

Thanks! C531, C532 & C533. Replace with 47uF / 63 volt caps.

@retfurb 13 күн бұрын

This is what was recommended on this particular model of the 3020. As said in the video, each amplifier manual needs checking. Just to make sure it is correct for the NAD in question. 👍🏻👍🏻

@humoursque8447 14 күн бұрын

5:46 For those who are not technician changing capacitors and soldering. Get yourself a headphone plug. Plugged it in then switch on. You won't hear any thuds. Complete silence.Leave it in for few seconds then remove same. You can play the amplifier as normal. Ideally if you can change the capacitors by all means.

@retfurb 14 күн бұрын

Yeah, that is a very good tip. Thank you for adding this. It essentially blocks the signal to the speakers, acting as a manual mute. 👍🏻👍🏻

@LaughingDolphin 13 күн бұрын

Got the same problem with my 3040 PE

@TechGorilla1987 14 күн бұрын

I had a nice set of NADs back in the day. I rather like the minimalist look.

@retfurb 14 күн бұрын

100% agree.

@TechGorilla1987 14 күн бұрын

@@retfurb I was also trying to make a cheeky joke :D That said, I did have this model and I believe I had the 1020 preamp which I fed to a big 'ol Hafler amp. Used it to DJ for the Parents Without Partners group here in the states

@retfurb 14 күн бұрын

@@TechGorilla1987 Ha, you never know when NAD is talked about. Although I did have someone on a different video, tell me it’s N.A.D and not NAD. 😃

@TechGorilla1987 14 күн бұрын

@@retfurb Yeah, life is too short to be that uptight. Stay well, my friend!

@retfurb 14 күн бұрын

@@TechGorilla1987 you too 👍🏻

@gillanland 13 күн бұрын

Would've been nice to show the schematic and try to explain what causes such a behavior of amplifier, but thank you anyway !

@retfurb 13 күн бұрын

Yes, I should have at least explained the muting circuit more. I was trying to keep the video shorter, so that was my fault.

@FrankJCarver 14 күн бұрын

Nice repair. Weird noises through the speaker are a pain. I have a Sony CD, cassette recorder, which was dead, but I have got working, but I have this annoying thud that comes when I turn it off and when I press the cassette player button. Do you think it could also be a bad cap?

@retfurb 14 күн бұрын

Thank you, it’s appreciate. Ah, good work. Always nice to get things working again. To be honest, it’s hard to say without looking at it. Could possibly be or something relating to the switched components maybe.

@FrankJCarver 14 күн бұрын

@@retfurb Thank you.

@blipco5 10 күн бұрын

I wouldn’t change that cool startup effect. In fact I’d pay extra for that option.

@blipco5 10 күн бұрын

In fact it sounds like the intro to Butt Hole Surfers "Pepper". 👍

@retfurb 10 күн бұрын

Does sound different, but not normal. I don’t think the speakers would thank me, if left with the issue. 🙂

@blipco5 10 күн бұрын

@@retfurb I make joke. But look up "Pepper" by BH Surfers.

@stevesmith3990 15 күн бұрын

Interesting. I have one exactly the same that has been fully restored and recapped. It has a bit of a thump when switching on but not really a problem. I read somewhere that its because the output should be muted for the first 10 seconds which wasn't included in the circuit on these models? Not sure if that's correct or whether mine still has a problem as you were able to completely silence that one. Thanks for the video.

@retfurb 15 күн бұрын

I think there are some differences. I have fully recapped others and still had a small hum / thud at start up. This is apparently completely normal and happened on some from new. Its always better to power on with volume muted. This was different from any others I listened to, Apart from one other that was similar. This method fixed that one also, That is why I was sure it would be this.