Thank you! Glad you brought up the point of re-capping is not repair. I would like to add that recapping does not improve anything except maybe reliability, unless there is a problem. Not a fan either of blanket recap.
@@RectifiedMetals At a certain point recapping makes sense, but too many folks with no repair experience read about recapping and think it will solve their issue. It rarely does. I thought STP was the racer's edge? (if you remember that you're old too!)
Well, there was that oddball cap that peeled back to reveal another cap. This NAD adventure taught me a lot. You have a talent at reading schematics, would love if you could show us how you read schematics because you have such a great approach on tracing back the short. Yeah my NAD 7240PE has a temp sensor on the heatsink. Great video. You have an awesome channel. Just subscribed!!
Great job Ray in your video when you showed all the caps you had replaced I couldn't tell but they looked like the blue Sanyo caps that are noturois for shorting and opening and should be replaced on sight im learning a lot thanks to your help and others like
Bill, I don't recall what they were, but I don't think it was a well known brand. For whatever reason, some NAD stuff just has a boatload of bad caps. Not all of it, but a lot. Some of it appears to be due to location near sources of heat. But mainly it just seems like poor quality components.
Hi Ray, It's been many years since I had a weirdly faulty capacitor that grounded the device 2 times in a row. Fortunately, I was working in R&D labs at the time, so I had access to first-class measurement technology. The capacitor behaved completely normally during the measurement, the capacity corresponded exactly, the ESR and EPR were completely within the table values. Nothing else could have caused this fault but this coupling capacitor, I had absolutely no idea what was going on. So I tried other measurement methods until the error became apparent when measuring the leakage. If the capacitor was exposed to only a certain load it worked fine, but if the charge increased above a certain limit, it broke through for a short time and after discharge it behaved normally again. I don't remember the manufacturer of the condenser, but the device is, it was JVC Nice day 🙂 Tom
Man, that's one for the record books. Kudos for tracing it to the only component that could cause the issue. Because most of us don't have access to the kind of test equipment you mention.
Hi Ray! I used to own an NAD 2200PE. It failed on me three times. The first time was a failed transistor and capacitor. The second time was another capacitor. The third time was yet another capacitor. I decided that I was going to do a total recap as I figured it was too much of a coincidence that at least two caps had failed in the period of only a few months. I've since discovered in my years of repairing audio gear that they are prone to capacitor failure. It also seems that other UA-camrs, including yourself, share that sentiment as well. That last failure scared the heck out of me. I had the stereo playing and was in another room. All of a sudden I heard a really loud gun coming from my HPM-100's. I thought the speakers may have been damaged but I got lucky. My speakers survived a catastrophic cap failure in the power supply. Talk about relieved.
You're not alone. Been my experience that they sound very good, are well designed but utilize cheap electrolytic caps. I have a NAD 1300 preamp and only 4 caps in it tested good. They were the only name brand (Rubycon) caps on the whole board. The others tested high ESR and/or low or no value.
Sorry I am late to the party, great stuff. I have a couple NAD 7155 and a 2200 that I am trying to rehab. Unlike you, I am a complete dumb a$$ on the electrical internals of most anything. Because of people like you I am learning. The last video on the NAD left me hanging, what was the problem? Can it be fixed? With this post you bring it all together, crappy parts, awesome.
What is really interesting here and maybe there is a parallel, recapping is a big thing in the Apple Macintosh vintage computer community. They simply leak or dry out, typically the former and those leaks can damage traces on these lower voltage boards but here is the thing, the iMac G5 was plagued with bad caps and it was, if memory serves, released in 2006. Apparently at the time, there was an electrolytic capacitor shortage and it may be possible that NAD and other manufacturers were simply dealing with market realities - bad caps and caps shortages.
Hi Ray, Hope you are great. Could you please explain how to connect my Onkyo AVR TXNR646 without pre out to My NAD C372. Hope you can help me. Regards,
Ajith, I'm not sure what your goal is, but you can take a fixed line level from Zone 2 on the Onkyo and run it into the Ax in on the AND and control the volume from there. If, however, you wish to just use the output stage on the AND and control volume from the Onkyo you would need a device called a Line Output Converter. They are mostly used in car audio applications but there's no reason you can't use onehere. They cost around US$15-20. Connect the line out from that device into the power amp in after removing the pre/main jumpers. HTH!
NAD- Not Adequately Designed. Nothing personal. I came up with that decades ago when I used to repair. Now due to financial reasons I have to do it again. I hated that NAD mixed Japanese and American transistors so you have to be careful subbing them out. We came up with acronyms for everything in the shop. One guy came up with "Oink N blow" (Onkyo.) I came up with Damn Equipment Never Operated Normally.(Denon). I dont know who made it but Sony- Some Operate Not Yours. Good luck with your move. I may be forced to. I won't be able to afford an apartment in my home state. It's expensive now. If you sell a stereo am fm signal generator with a pilot let me know. I just picked up a boonton 103a. I have to get a shop going in my garage to try to make ends meet unless you think it's a bad idea. I just do audio. Great videos. I just found your channel a few weeks ago. I really like your presentation. If you want a video idea, if you havent made one already, what are the do's and donts of making a shop at home.
I hear you on the audio stuff; each manufacturer has their own Achilles heel. I also hear you on affordability. Whoever said life is cheap never tried to live in the 21st century.
Thank you! Glad you brought up the point of re-capping is not repair. I would like to add that recapping does not improve anything except maybe reliability, unless there is a problem. Not a fan either of blanket recap.
Not saying it’s a bad idea, it’s just a service that seems to be sold, as the old STP can fixing a knocking car engine thing, far too often.
@@RectifiedMetals At a certain point recapping makes sense, but too many folks with no repair experience read about recapping and think it will solve their issue. It rarely does.
I thought STP was the racer's edge? (if you remember that you're old too!)
@@raygianelli3612 too old🙈
Well, there was that oddball cap that peeled back to reveal another cap. This NAD adventure taught me a lot. You have a talent at reading schematics, would love if you could show us how you read schematics because you have such a great approach on tracing back the short. Yeah my NAD 7240PE has a temp sensor on the heatsink. Great video. You have an awesome channel. Just subscribed!!
Great job Ray in your video when you showed all the caps you had replaced I couldn't tell but they looked like the blue Sanyo caps that are noturois for shorting and opening and should be replaced on sight im learning a lot thanks to your help and others like
Bill, I don't recall what they were, but I don't think it was a well known brand. For whatever reason, some NAD stuff just has a boatload of bad caps. Not all of it, but a lot. Some of it appears to be due to location near sources of heat. But mainly it just seems like poor quality components.
Hi Ray, It's been many years since I had a weirdly faulty capacitor that grounded the device 2 times in a row. Fortunately, I was working in R&D labs at the time, so I had access to first-class measurement technology. The capacitor behaved completely normally during the measurement, the capacity corresponded exactly, the ESR and EPR were completely within the table values. Nothing else could have caused this fault but this coupling capacitor, I had absolutely no idea what was going on. So I tried other measurement methods until the error became apparent when measuring the leakage. If the capacitor was exposed to only a certain load it worked fine, but if the charge increased above a certain limit, it broke through for a short time and after discharge it behaved normally again. I don't remember the manufacturer of the condenser, but the device is, it was JVC
Nice day 🙂 Tom
Man, that's one for the record books. Kudos for tracing it to the only component that could cause the issue. Because most of us don't have access to the kind of test equipment you mention.
Hi Ray! I used to own an NAD 2200PE. It failed on me three times. The first time was a failed transistor and capacitor. The second time was another capacitor. The third time was yet another capacitor. I decided that I was going to do a total recap as I figured it was too much of a coincidence that at least two caps had failed in the period of only a few months. I've since discovered in my years of repairing audio gear that they are prone to capacitor failure. It also seems that other UA-camrs, including yourself, share that sentiment as well.
That last failure scared the heck out of me. I had the stereo playing and was in another room. All of a sudden I heard a really loud gun coming from my HPM-100's. I thought the speakers may have been damaged but I got lucky. My speakers survived a catastrophic cap failure in the power supply. Talk about relieved.
You're not alone. Been my experience that they sound very good, are well designed but utilize cheap electrolytic caps. I have a NAD 1300 preamp and only 4 caps in it tested good. They were the only name brand (Rubycon) caps on the whole board. The others tested high ESR and/or low or no value.
Great work Ray...cheers.
Sorry I am late to the party, great stuff. I have a couple NAD 7155 and a 2200 that I am trying to rehab. Unlike you, I am a complete dumb a$$ on the electrical internals of most anything. Because of people like you I am learning. The last video on the NAD left me hanging, what was the problem? Can it be fixed? With this post you bring it all together, crappy parts, awesome.
What is really interesting here and maybe there is a parallel, recapping is a big thing in the Apple Macintosh vintage computer community. They simply leak or dry out, typically the former and those leaks can damage traces on these lower voltage boards but here is the thing, the iMac G5 was plagued with bad caps and it was, if memory serves, released in 2006. Apparently at the time, there was an electrolytic capacitor shortage and it may be possible that NAD and other manufacturers were simply dealing with market realities - bad caps and caps shortages.
Here's your answer:
en.wikipedia.org/wiki/Capacitor_plague
Hi Ray,
Hope you are great.
Could you please explain how to connect my Onkyo AVR TXNR646 without pre out to My NAD C372. Hope you can help me.
Regards,
Ajith, I'm not sure what your goal is, but you can take a fixed line level from Zone 2 on the Onkyo and run it into the Ax in on the AND and control the volume from there. If, however, you wish to just use the output stage on the AND and control volume from the Onkyo you would need a device called a Line Output Converter. They are mostly used in car audio applications but there's no reason you can't use onehere. They cost around US$15-20. Connect the line out from that device into the power amp in after removing the pre/main jumpers. HTH!
Unfortunately predictive text decided I meant AND instead of NAD. Sorry for any confusion.
NAD- Not Adequately Designed. Nothing personal. I came up with that decades ago when I used to repair. Now due to financial reasons I have to do it again. I hated that NAD mixed Japanese and American transistors so you have to be careful subbing them out.
We came up with acronyms for everything in the shop. One guy came up with "Oink N blow" (Onkyo.) I came up with Damn Equipment Never Operated Normally.(Denon). I dont know who made it but Sony- Some Operate Not Yours.
Good luck with your move. I may be forced to. I won't be able to afford an apartment in my home state. It's expensive now. If you sell a stereo am fm signal generator with a pilot let me know. I just picked up a boonton 103a. I have to get a shop going in my garage to try to make ends meet unless you think it's a bad idea. I just do audio.
Great videos. I just found your channel a few weeks ago. I really like your presentation. If you want a video idea, if you havent made one already, what are the do's and donts of making a shop at home.
I hear you on the audio stuff; each manufacturer has their own Achilles heel.
I also hear you on affordability. Whoever said life is cheap never tried to live in the 21st century.