DR #51 - Pure Electronic Troubleshooting with an NAD 3240PE Stereo Amplifier 

Long time audiophile and repair video connoisseur here, only recently ran across your videos. _Really_ enjoy your concise, no fluff, straight to the point approach. Not sure why you don't have a bazillion subs, but it's NOT because of lack of quality of your content. Don't change a thing and just keep cranking them out - you've got a great recipe.

That was the best 7 minutes watching you troubleshoot this amplifier. Amazing. You make it look so easy, when, in fact, it's not.

Okay, I'm IMPRESSED. Way to break it down smartly and in record time.

So easy to follow, and some great fault-finding tips along the way. Also; no messing about; straight through the diag and on to the repair - great job.

One of the best amplifier repair videos i have seen. Thank you.

Another great video. No cereal or filler, all red meat! You've got the best short form videos (which I'm a big believer in) I've ever seen on RU-vid.

Thanks Nick....loved the red "x" through the tested sections.

Nice trouble-shooting steps!

I like your direct style for explaining your method. Goodyear Jobs. Thanks.

This is awesome. Well explained and easy to follow. Can't wait for the next one!

How cool was that? Highly informative and great delivery. Looking forward to the next installment.

Once again a very entertaining and informative amp repair! Thank you

Excellent,thank you for uploading this trouble shooting method.

I love your vids, amazing troubleshooting ! you gain a new subscriber from France.

Great presentation Sir! Thank you for sharing.

Excellent and Concise diagnostic analysis. Thank you . Rawalpindi

Simply great!!! Thank you.

Very clear and helpful instruction, thank you.

Great video, very useful and informative. Thank you !

Great troubleshooting!

Excellent method

Nice Neat and Clean !

Interesting contrasting this NAD with amps of old that could run for decades without problems. Also the interior build quality in evidence with the Sony TA-2050, TA-F3A and Hitachi HA-330. All built in Japan.

Fantastic video! So straightforward and clear! This is the first video of yours I have watched. I will definitely check out others. Can I ask if you test ESR values to find bad caps too?

Nice lesson

Thank you sir!

Gut erklärt, Danke.

These 1980s NADs are excellent amps, but they suffer from the use of cheap components that were used to keep the costs down. A full re-cap is almost always necessary.

Thanks for these great tutorials.

Incidentally i also recently purchased 3240PE amp and your video is the only repair video that i could find!. Mine works, those capacitors haven't failed yet but looks like it needs full sevice( very old capacitors, corrosive glue, dry heatsync compaund and darkened areas on pcb from possibly overheating) . If you deside to make a video on full servicing i'll follow your steps. I have a question as well, there are some sort of breakers BK-1,2 A-40 on the output, i guess they are for DC protection but they are not relays so i don't really understand how they work. Thank you.

Merci for this video.

Noob like me finds your vids essential

Nice one.

Seems like it should have dc output from that opamp.. and yes it would be see as a fault to the comparator that controls the relay. Im confused why i dont see any zeners being used with those dropping resistors and caps.. I would increase the cap values and the resistor wattage. So it wont happen again.

I like the way you go through that process of elimination until you pinpoint what the problem is. Very efficient. I live in North Carolina; I have an NAD receiver 7400. I have not used it for years and recently, I tried to turn it on. Sounds is coming in and out and at times, it sounds like what you hear when you radio is not using the correct frequency. How can I go about having somebody looks at it? Do you know a place in North Carolina I can go to, by any chance?

could you do a video explaining how to inject the sine, and what are those 2 brown things on you wall that its connected to? i want to learn this

❤🎉❤

Where do you repair guys get the schematics from?

Huh, nice deductions. How do you find schematics for old equipment like this? Thanks.

Didn't you rule out the power supply when you demonstrated that the power amplifier worked?

Goof video, shows exzellent how to search for faults

Where are you located?

So again CA is tricky with low quality-short lifetime caps.

Oh my.. when i saw you use solder wick.. i looked at the ground. The caps cant cause the problem..with them off the board you should still get a voltage on both sides of the dropping resistors.. the caps give you stability. All of the solder looks dry..come on if your gonna teach. Stop blaming the caps. You simply do continuity test and youll find no connection between the rear of the resistor and the pin on the ic.. second thought.. the signal ground has bad connection also..thats the only way the voltage could go up on the other rail

That is the worst heatsink i have ever seen on an amplifier..

Moin, der Mann hat absolut keine Ahnung, wie man ein Verstärker vorab prüft. Er hat wieder einen scope noch ein Sinus Generator noch belastungs Widerstände. Somit ist das ganze Video was man hier sieht für die Tonne. Junge Leute, die gerne etwas lernen möchten sollten sich nicht an dieses Video halten ‼️👈 Dieser Text wurde per Ki erstellt und kann Fehler enthalten. Die hauptaussage dass der Mann keine Ahnung hat bleibt aber erhalten!!!!!