![Matt Dealy](/img/default-banner.jpg)
- 108
- 433 638
Matt Dealy
United States
Registrace 10. 08. 2014
I restore old stereo systems and build some furniture. I offer repair and customization services for amplifiers, receivers, and turntables. I accept repairs that include customizations (new veneer or wood case, crossover upgrades, full amplifier/receiver rebuilds etc). My shop minimum charge is currently $300 + shipping which means I will do a minimum $300 of work to whatever is sent to me. We can discuss what specific repairs that would include. If you've got a project that meets these standards, email me: shuksanaudio@gmail.com
It's so EASY to repair: Yamaha CR 450
eBay sale 👉 www.ebay.com/itm/387155095617
I picked up this Yamaha CR 450 a few months ago and was told the meter lamp was burnt out and the left channel had distortion. The CR-450 was released in 1976 as a replacement for the CR-400 which was having issues powering the lower impedance power hungry speakers that were being released in the US. They doubled the output transistors and power handling while also beefing up the power supply and removing the current limiting circuit. It can produce nearly double the 32 watt per channel output at 8 ohms to a 4 ohm speaker. It sounds very warm compared to the rest of Yamaha’s 70’s lineup and is one of my favorite looking so I was very excited to get it working!
The left channel distortion sounded to me like a power supply issue but I started by troubleshooting it and ended up finding a horrendous previous repair job on the output transistors. After fixing that I moved into recapping most of the receiver and replacing all of the output transistors. I also updated the lamps to LEDs and added a couple of additional LEDs to light the tuning meters.
Parts list 👇 docs.google.com/spreadsheets/d/1nKSGNtAMdVTtCfPJ-QWretgE-pxqfcVjRHVbkpLzipw/edit?usp=sharing
Known bad transistor list 👇docs.google.com/spreadsheets/d/1zE0jlgjpfqeS3fVZ23wvHWG89xoJbi9dETIpIZcztuo/edit?usp=sharing
XraytonyB video on transistor replacement 👉 czcams.com/video/KKXF-onCwbQ/video.html
Chapters:
00:00 Intro and background info
00:29 Parts list
00:41 Electricity warning
01:21 Start the timer & initial diagnosis
01:56 Somebody used sub optimal output transistors
02:09 Testing with speakers for the first time
02:33 Checking the relay
02:53 Reading the schematic + checking rail voltage
04:59 CABLE MANAGEMENT
05:16 Checking the bad transistors
06:31 Replacing the Output Transistors
07:36 Replacing the 3A speaker protection fuse
07:40 Washing Mica Insulators & Installing new output transistors
11:20 Did we fix the issue?!?
12:20 Removing & cleaning the knobs & faceplate
13:34 Replacing the center meter lamp
14:57 Filter capacitors
17:19 Finishing the Meter LEDs
18:41 Dial Pointer LED swap
19:45 Cleaning & Lubricating the Controls
23:36 Testing the capacitors
24:21 Known Bad Transistor Replacement
25:30 Adjusting Bias (Idling Current)
27:21 Reassembling the faceplate and knobs
27:59 Outro and listening sesh
••••••••••••••••••••••••••••••••••••••••••••••••••••••••
My name is Matt. I live in Washington State and create content around vintage stereos and other audio equipment. I approach the hobby from a technical standpoint and am learning about circuit design and reparing and calibrating amps, turntables, speakers, etc. I really appreciate a good aesthetic and the vintage stuff fits my taste.
Instagram: @Shuksanaudio
Tik Tok: @Thedealydeal
I picked up this Yamaha CR 450 a few months ago and was told the meter lamp was burnt out and the left channel had distortion. The CR-450 was released in 1976 as a replacement for the CR-400 which was having issues powering the lower impedance power hungry speakers that were being released in the US. They doubled the output transistors and power handling while also beefing up the power supply and removing the current limiting circuit. It can produce nearly double the 32 watt per channel output at 8 ohms to a 4 ohm speaker. It sounds very warm compared to the rest of Yamaha’s 70’s lineup and is one of my favorite looking so I was very excited to get it working!
The left channel distortion sounded to me like a power supply issue but I started by troubleshooting it and ended up finding a horrendous previous repair job on the output transistors. After fixing that I moved into recapping most of the receiver and replacing all of the output transistors. I also updated the lamps to LEDs and added a couple of additional LEDs to light the tuning meters.
Parts list 👇 docs.google.com/spreadsheets/d/1nKSGNtAMdVTtCfPJ-QWretgE-pxqfcVjRHVbkpLzipw/edit?usp=sharing
Known bad transistor list 👇docs.google.com/spreadsheets/d/1zE0jlgjpfqeS3fVZ23wvHWG89xoJbi9dETIpIZcztuo/edit?usp=sharing
XraytonyB video on transistor replacement 👉 czcams.com/video/KKXF-onCwbQ/video.html
Chapters:
00:00 Intro and background info
00:29 Parts list
00:41 Electricity warning
01:21 Start the timer & initial diagnosis
01:56 Somebody used sub optimal output transistors
02:09 Testing with speakers for the first time
02:33 Checking the relay
02:53 Reading the schematic + checking rail voltage
04:59 CABLE MANAGEMENT
05:16 Checking the bad transistors
06:31 Replacing the Output Transistors
07:36 Replacing the 3A speaker protection fuse
07:40 Washing Mica Insulators & Installing new output transistors
11:20 Did we fix the issue?!?
12:20 Removing & cleaning the knobs & faceplate
13:34 Replacing the center meter lamp
14:57 Filter capacitors
17:19 Finishing the Meter LEDs
18:41 Dial Pointer LED swap
19:45 Cleaning & Lubricating the Controls
23:36 Testing the capacitors
24:21 Known Bad Transistor Replacement
25:30 Adjusting Bias (Idling Current)
27:21 Reassembling the faceplate and knobs
27:59 Outro and listening sesh
••••••••••••••••••••••••••••••••••••••••••••••••••••••••
My name is Matt. I live in Washington State and create content around vintage stereos and other audio equipment. I approach the hobby from a technical standpoint and am learning about circuit design and reparing and calibrating amps, turntables, speakers, etc. I really appreciate a good aesthetic and the vintage stuff fits my taste.
Instagram: @Shuksanaudio
Tik Tok: @Thedealydeal
zhlédnutí: 880
Video
Restoring A Mid Century Classic: The Advent 5012
zhlédnutí 1,6KPřed měsícem
The large Advent loudspeaker was released in 1968, designed by legendary sound engineer Henry Kloss. His goal was to create a budget friendly speaker that could compete with models that were far more expensive. The original Large Advent (OLA) went on to develop a cult following and garnered attention for it's incredible sound when stacked two pairs high. In the 70's the speaker was updated to t...
MY Hifi Holy Grail: Yamaha CR-3020
zhlédnutí 19KPřed 2 měsíci
When I was 16 I found out about the Yamaha CR-3020, an absolutely massive, $1500, 160W per channel, 78lb, ebony veneered, 25 inch wide beast of a stereo receiver that was released in 1978. And at 28 years old, I've finally managed to buy one. Not only is that incredibly exciting in and of itself, but I also have the skills to service it and this one was having some issues with the sound cutting...
The BEST Pioneer Speakers? CS-63DX Restoration
zhlédnutí 2,5KPřed 2 měsíci
The BEST Pioneer Speakers? CS-63DX Restoration
Trash to Treasure: Marantz SR-1000 Restoration
zhlédnutí 2,7KPřed 3 měsíci
Trash to Treasure: Marantz SR-1000 Restoration
I Almost Lost $1000 (Marantz 2325 + Klipsch Forte)
zhlédnutí 18KPřed 3 měsíci
I Almost Lost $1000 (Marantz 2325 Klipsch Forte)
Restoring a '70s Pioneer SX-636 RECEIVER!
zhlédnutí 1,2KPřed 4 měsíci
Restoring a '70s Pioneer SX-636 RECEIVER!
Can you fix a Pioneer PT-103F tweeter?
zhlédnutí 728Před 5 měsíci
Can you fix a Pioneer PT-103F tweeter?
Restoring a Pioneer SX 424 (Lamps, Caps, Transistors)
zhlédnutí 1,1KPřed 5 měsíci
Restoring a Pioneer SX 424 (Lamps, Caps, Transistors)
Upgrade Your Realistic Minimus 7 Speakers (PZ Mod)
zhlédnutí 6KPřed 7 měsíci
Upgrade Your Realistic Minimus 7 Speakers (PZ Mod)
These Klipsch KG 4.2 speakers need some love (Crossover and rubber surround)
zhlédnutí 3,5KPřed 11 měsíci
These Klipsch KG 4.2 speakers need some love (Crossover and rubber surround)
Restoring a set of Advent Baby II Speakers with new Foam Surrounds
zhlédnutí 2KPřed rokem
Restoring a set of Advent Baby II Speakers with new Foam Surrounds
How to fix dents in wood or wood veneer on stereo equipment
zhlédnutí 1,4KPřed rokem
How to fix dents in wood or wood veneer on stereo equipment
How to clean Acoustic Research brass speaker badges
zhlédnutí 171Před rokem
How to clean Acoustic Research brass speaker badges
How to Solder the ends of your speaker wire
zhlédnutí 6KPřed rokem
How to Solder the ends of your speaker wire
This is where it bugs me about people selling vintage equipment for big money. Just to fix a simple problem took 4 hours, and you still have to do the recap. Imagine what a person would pay if they didn't have the knowledge, skill, and tools to do it themselves. Now, that $200 vintage receiver just cost you $600 to $800 more to restore; and that's on the cheap. I'd charge at least $100 per hour, plus parts to do this work. If it takes 10 hours, there's a $1000 on a unit that's not worth more than $300.
It’s not replacing isn’t good it’s the cost. The work done plus parts on the Yamaha in video is not even worth it
I swear on removing the blue filters and putting in the original light bulbs, looks real good and much brighter
A. The B one has a not-so-nice sounding peak in the upper mids.
Could it be that the recapper replaced the feedback compensation cap with a 10x value cap? On the tube amp that is.
Nice video. Do yourself a favor and try running these after removing the back, pulling the insulation and removing the chamber off the back of the sealed midrange. IMHO, this made my CS-63DX's come alive. Of course, you'll lose some bass, but if you have a sub I think they sound great. I generally can't stand box speakers and listen to Open Baffles, preferably. So, I'm biased. But you should try it. Also, it's worth pointing out the incredible materials that Pioneer used at the time: 100% void free Mahogany plywood. I've never seen anything like it before.
Nice work man, keep up the great work and content!
Thank you! I really appreciate that! Love your content as well.
and also to be sure and replace them with same value and same type for best sound.
I just found three pair in a storage unit. I have a real problem. i bought those 2 other pair and Sansui 5000X
@@Red-yx5yo wooow that’s so cool! I’d be freaking out with a find like that haha
Dude -- I've been looking for a shirt just like that. Where from??
Ayye thanks for noticing! I hunted this one down until I found one I was happy with. It's from a company called "Pact". Unfortunately, they no longer have this color but this is the one: wearpact.com/men/apparel/all%20tops/clearance%20thermal%20waffle%20henley/wb1-mwh-cml?glCountry=US&glCurrency=USD
Just picked up an aluminum pair in Goodwill for $4. I was surprised they sounded pretty good on the STA-112 that I got with them for $20.
I used to sell those back when I was a hi-fi salesman (1976-1983). My only complaint about Yamaha was the price. I just thought they were way over priced. Personally I ended up with a HItachi HMA 8300 and HMA 7500, bi-amped into ESS AMT 1B monitors. I liked the sound and the price. But the ONLY bad thing I'll say about the Yamaha stuff is I think it was overpriced. It was solid stuff. Heck, I think BMW's are overpriced, but it doesn't mean I think they are bad cars. Well, not the older ones.🤣
You’ve done well. All Yamaha CR’s deserve this kind of love.🌹
Good job!❤
For the first time I'm not in line with your opinion.😮 Owner should bring their Amp to you @MattDealy and let you decide for the right type of Cap in the right price range. And for all the other TLC you would give a piece of history like that. 👍😃 Again, great Channel Mate. Thank you.
Haha fair enough! It's not easy to find the right types of caps and put together a list of parts. Thank you for your confidence and positive words! You are most welcome :)
I did this project three years ago. I ended up cutting a piece of hardboard the size of the bottom of the cabinet. Built the crossover on that and hot glued it inside.
Amazing! Hardboard works really well.
I miss Radio Shack.😢
Me too 😢 I've been building up a parts collection so I have most of what I need and it gives me throwbacks to all of the drawers in RS. Parts digging is so fun.
That green jumper wire being installed to replace the pad that got torched because of operator inexperience tells you all you need to know about this "expert".
If you care to expound the "expert" is here to learn. Or are you saying that I installed the jumper wire because I torched the pad? If you watch the full length video, you'd know that the wire is there because someone else butchered a soldering job and ruined the pad...
B is louder.
It's not. They levels were matched.
Good quality capacitors won't need replacing.
Really depends where that stereo was sitting for the last 54 years… how many times it’s been moved (or dropped in a storage box). Or if that things been playing constantly for 40 of the 54 now doesn’t it.
The manufacturer sof the capacitors disagrees with you. Most caps are rated for 2000-3000 hours at rated voltage and temperature. The UPW series from nichicon is rated to be stored at 105°C for 1000 hours max to be able to reform back to spec. Obviously you wouldn't be storing them at 105 but they still have a shelf life. Electrolytics will dry out over time where other types of capacitors like ceramic, will not. That is why I recommend to replace electrolytics, not all capacitors otherwise you would need to replace hundreds of components. There are so many opinions around capacitors and I understand that people want to keep a piece of gear in original condition. The truth is, electrolytics don't age well. They tend of develop high ESR for higher frequencies as they dry which can be part of the reason for a certain sound. Often times we find a component (Whether it's a telefunken microphone from the 50's or a certain type of capacitor) has a unique sound to it because it is out of spec. Nothing wrong with that.
Upspeak - never once
Bro, thats a nice sterio!
Thank you haha
Anyone who thinks failing caps are somehow "the sound" must also think power supplies aren't really working until they smoke.
I'm not sure that I agree with the comparison but yes, it is strange how people want to keep failing capacitors in their amp.
I think you’re both not understanding why “audiophiles” claim that changing caps changes the sound. They feel that way because they claim that the older style caps sound better than the newer “better” caps. They don’t think caps that are out of spec sound better. They aren’t completely wrong. The older receivers were designed and voiced with electrolytic caps from that era that did in fact have different esr and ripple measurements than newer equivalents.
Unfortunately many older receivers do need at least some of their caps replaced. By old I mean more than 15 years. Under 15 years I have rarely detected out of spec caps.
@@Kevin19700 yep! Depends on the component and build quality but most capacitors are only rated for 2000-3000 hours at rated temperature and voltage
Guess you learn something every day
@@Car-Guy_ak that’s what I’m trying to do haha thanks for watching!
Oh dear. You're really sticking your neck out there. Cue all the cap replacement haters.
ALL old electrolytics should be replaced. Those caps age. And age badly. Polys should stay.
Haha yea I am lol. You should see all of the people commenting why you shouldn’t replace 50 year old out of spec electrolytics as though the originals were made of some magic substance haha thanks for watching!
5:46 Vintage audio tech with 47 years experience here. I saw this video months ago, but just now noticed that you "don't use solder with flux in it." How do you get it to stick? And why would you do such a thing? What's wrong with rosin-core solder? (Remember, you're arguing with literally EVERYONE who has ever soldered an electrical connection.)
I use flux free solder because it helps keep the phase alignment of my prognosticator and transmogrifier at a perfect 180°...Just kidding, I have no idea why I said that in the video haha. I must have been very tired that day. I will add a card to that time stamp to clarify. I use Kester 60/40 rosin core solder. You're always finding my mistakes and helping to educate the people and me, Scott. I appreciate it!
@@MattDealy People have been finding my mistakes for 60 years, my friend! But that's how we learn. Thanks!
the blue led's change the color they dont look as good as white bulbs!
Personal preference I suppose. I like the warmer tone as well. Thanks for watching!
Nice find man I’ve found some really nice audio equipment as well 🤙🏻🦾
Thanks!
A is the tubes, but either the EQ is not right or there’s a bad tube, but something ain’t right. Tube amps sound glorious, but I do like some vintage integrateds. .
You're not the first to say this. I'll get a tube tester to confirm it one of these days.
@@MattDealy FWIW, I certainly don’t mean that as an insult. Not that this necessarily matters, but I work at a shop doing guitar and tube amp repairs. It sounds more like an EQ thing on the amp. Were both amps it set flat? A quick way to “test” the tubes is to put the balance knob all the way to the R and L and listen. If only one side is doing it, you’ll hear it, and know it’s a tube. Try switching the tubes to the other side to see if the issue follows the tube. If it doesn’t, it’s most likely an EQ issue. Tube testers can be very expensive, but you can also check tubes with a multimeter. There’s plenty of vids on how to it. Good luck, man! ✌️🎶😊
@@NickP333 Thanks for the tips! The tubes are good from what I've tested them. No difference in R or L sound. The amp was recapped a few years before I got it and they may have messed something up but I've checked over it and it looks fine. Both EQs were set to flat :)
Can I plug 4 Ohm speakers into my vintage 8 ohm receiver?
Yes, as long as the receiver says that it can power 4 ohm speakers on the back. Depending on what amp it is, you also might not want to turn it up very loud as the lower impedance speakers will draw more power and make the amp run hotter. Thanks for watching!
Two or a pair 8 ohm speakers creates a 4 0hm load on the amplifier. 2 4 ohm speakers amp will see a 2 0hm load. Check and see 🙈 f your amp is rated for 2 ohm. If the amp says 1 pair speaker A can handle 4-16 ohm speakers it should be ok as last ng as you do not connect more low impedance speakers to speaker B section. I would try check user manual to be safe
@@johncribbs8382 These are great tips!
Recently got a 450 for $85 and just needed its controls cleaned. Sounds fantastic with my kef q150s!
Ohh that's a steal! I bet it powers them nicely! Thanks for watching :)
Excellent work Matt. Just picked up a Yamaha CR-820! Super excited to work on it.
Thank you! That's super exciting! The CR-820 is a great unit. I hope it goes well!
the service manual does call for 50 mV of DC...
Yes, that is what I said in the video, did I not?
@@MattDealy at 25:41 I thought I hear you say AC, twice?
@@marcvdfv8431 Ahh yes! That is my bad, I sometimes say the wrong thing in the video haha. Hard to keep what's in my head and what's coming out of it in line sometimes. Thanks for pointing it out!
in the less powerfull units I found a lot of times that petroleum jelly was used as heat compound (or something that looked like it)
Hmm that is odd. It seems to have worked for a long time, whatever it is. Thanks for watching!
@@MattDealy well, it doesn't dry out and does the job, and is a lot less messy! And thanks for the video!
Just don't use Colgate old style white toothpaste like the manufacturers.they should have a thin plastic gasket as well as paste.
@@johncribbs8382 The insulator should not be plastic as that can still conduct. The insulator should be Mica. They are 2 cents a piece on mouser. Came from the factory with insulators.
Awesome analytical approach to the restoration. Hope you'll make a video when you sort out my Yamaha CA-800!
Thanks, Edley! I will make a video about it. Might be a shorter one as I'm a bit swamped with work and these longer videos take a long time to put together. I'm looking forward to getting to yours though!
Another great video, Matt. I’ll be sending you an email soon.
Why thank you! I look forward to hearing from you :)
I hope you enjoyed listening to Merle Haggard...and all kinds of other music...on this machine before you let it go. Me? I'd have a hard time letting this beauty go! Mahalo for a very clear and educational video. Much aloha to you!
I have been jamming it a lot! Really love the way it sounds. I've been listening to a lot of Merle Haggard and other Bakersfield artists lately. Really enjoy it! Yes this is a hard one to let go of. Moving through gear quickly has it's fun sides though. A new amp in the living room every week is fun haha. Looking forward to getting to more of my personal projects later this year that I won't be listing for sale! Mahalo, Jim!
@@MattDealy Ah! The "Bakersfield Sound" is awesome. I went a bit too far with it a couple of times: I listened to that achingly soulful music...on my car stereo...during road trips in and around Bakersfield. I tried to drown myself in it.🤣🤣 Aloha!
This CR-450 is now for sale on my eBay www.ebay.com/itm/387155095617 I will be starting a series of deep dives on certain aspects of repairing vintage gear, what would you like to hear about? Thanks so much for watching!
Meow. My cats also love vintage hifi.
Nice! Haha yea I think they like how much warmth it all puts off 😂 Thanks for watching!
Wow! That’s a fantastic deal! Too bad it was fake:( And way to go mentioning Venmo and normal paypal with purchase protection because I remember my first time trying to sell just a set a spare tires on Craigslist and I almost sold it to a guy who “would have a friend that would pick them up and pass me a cashiers check”. I told him to let me think about it and then googled the exact words he told me and found many people who were scammed.. then I read about the whole don’t do western unions, PayPal friends and family, and Zelle.. people need to know this.. it’s either cash up front or Venmo/normal PayPal business transfers where you are protected from scams. No checks.. someone had their $50k bmw stolen after selling it to someone they met in person who passed them a fake cashiers check.. so watch out!
where did you purchase your new surrounds (foam rings) ?
eBay! I think I got them from Simply Speakers. Thanks for watching!
Working on Min 7's is like therapy for non-bench guys. I did the Zilch and used zip ties and wire connectors. Maybe some black tape. Not good at soldering..but I'm going to try to clean up my next crossover. I just lined it with Dynamat too. Sound is a bit more solid. Every little thing you can do to these helps. You did a wonderful job on the board from start to finish. I also hope to make over my Min 77's and 3.5's.
HAha yes! They're so fun to tinker with and very low pressure. I read about someone making a small line array out of 24 of them and I kinda want to try that eventually haha. The Dynamat is a good idea! I'm glad you liked the board! I'm working on a new iteration that's even cleaner to sell as a drop in replacement for the old Xover. Pretty stoked about it. Thanks for watching!
keep doing these!
Thanks for the request! I love thrifting for gear but have slowed down because I was finding gear faster than I could fix it haha. I am working through my hoard and once it's smaller I will start going to garage sales and thrift stores more! Tl;dr More coming, just need to fix stuff first.
Very cool
wha.?.?.? IT DOES EXIST!!!!
I am restoring a pair of 4002s, great speakers
Nice! Those are sweet! What all are you doing to them?
@@MattDealy refoam and recap, they’re unfortunately vinyl wrap instead of veneer so theres not much I can do to the exterior. I was super confused with the 7 and 7.5uf capacitor and their decision to change it when Jensen bought the company, but I stuck with the 7uf.
@@SmithFitzgerald-uz8fy Nice! Unfortunate that they're vinyl. You can buy new vinyl wrap for them but it likely won't match what's on there already so you'd have to completely re wrap both speakers but it's fairly easy to apply. My guess is that the 7.5uf may have been cheaper somehow or maybe it was a slight change in the crossover point to adapt to the round magnet woofer and tweeter that they started using.
Nice work!
Thanks so much, Tennyson!
You really earned it to enjoy your music now. Have fun with it pal, you made a great job!
Thank you! I've been really enjoying listening to these for the last couple of weeks. I appreciate you!
One of my favorite CZcams channel.
Aww thank you! I'm glad you like it :)