I wish modern SMPS units were shielded like that, interference is still a big problem if you're a fan of analogue radio.

@12voltvids

2 ай бұрын

These days interference is out the the window. Led inverters cause lots. Those fancy rope lights that everyone has as decorations create tons of interference. I'm talking the ones where you can have chasing lights that are all connected by a bus and controller that fires the leds. Thats a constant high speed data stream that controls the leds. You thought plaama tv was bad, well the new oled is almost. Sure they don't radiate as much as old plasma but they spill make a racket that interfere with radio. Am and shortwave radio is pretty much on the way out so protecting from interference is not a priority. I remember back when if you owned a shortwave radio people branded you a communist. That was the paranoia of the 60s.

Thanks for another interesting vid. Enjoy seeing the ins and outs of these older devices.

I had the 550, this receiver’s mostly identical but less powerful little brother. In some ways I still consider it the best receiver I ever owned. Sounded great for a mass market unit, looked beautiful and the ergonomics were fantastic. Best remote I’ve ever used. I miss it all the time.

@12voltvids

2 ай бұрын

The 550 was a conventional transformer wasn't it?

@sunspot42

2 ай бұрын

@@12voltvids Might have been. I don’t remember what it looked like inside much anymore. I don’t think I ever took the case off, just peered thru the vents. My first one died during a blackout. Voltage spike I assume. The repair did not go well. Returned it to the store and they gave me a new one. Yea!

You can't believe the damage that circuit glue can do. It's like an acid.

@12voltvids

2 ай бұрын

Yip

Why on earth did the FCC think these power supplies were going to... Oh right they're the same agency that thought cell phones would cause planes to crash for 30 years.

@12voltvids

2 ай бұрын

Led inverter cause plenty if noise.

@MikeDS49

Ай бұрын

@@12voltvids Is there any truth that flying over many cellular towers quickly during take of and landing would have burdened the network with way too many handoffs?

Fortunately there are a few of us alive that understand these. I had one of these on my bench back when it was fairly new. I am retired but I still keep my hands-on because no one seems to do any kind of component level repair anymore.

@12voltvids

Ай бұрын

Component repair js all i did. Never changed a board.

I had a Very similar Sony out in the shop. I hated the tuning of it, it was very fumbly to do sometimes. Gave it away and went with a more Conventional Marantz Receiver. Thanks Dave....

Brilliant! Nice work as always!

I'm a DOCTOR Jim, NOT an electronics technician!-LOL!!!!!

Generally I don't comment until the end of the video but I know exactly the resistor you're talking about. The thing gets so hot that it will blow its own thermal fuse. Although I have a tendency to just to bypass the thermal fuse with a standard fuse, end up the water of the resistor so far, my unit has not blown that resistor

@12voltvids

2 ай бұрын

It already has a standard fuse. I have seen many where it is just bypassed.The idea behind the thermal fuse is if someone is driving the crap out of it the resistor will heat up and the thermal fuse will open and kill the power. By pass it and it will just keep going until the the power supply dynamites itself and then you have blown transistors, burnt up transformers and a bunch of carnage. The power supply looks simple but those little transformers that i took the glue off are critical, If not wound exactly correct the new transistors will blow as soon as it is powered up. By blow I mean blow. The plastic is separated from the base. There is malice in that palace.

I have one of these a later av matrix model I love mine

Awesome video!!

I have an integrated amplifier from this lineup. A ta-ax6. I think it's a great sounding amplifier. Great phono pre, I use it to rip records to my pc. A very very uncommon unit.

Yes, a friend of mine got a hit from a sony amplifier capacitor a 220v 22,000uF, he now has a pacemaker, it damaged his heart bigtime, hes only 35 years old.

@12voltvids

2 ай бұрын

I was belted with about 2100 volts. Threw me across the shop. For years I had flashbacks.

I had one of these receivers and I i got with it's matching components. The amp would power on but no sound from the speakers and the tuner acted crazy when trying to tune in a station.

I have a couple nice looking Sony receivers with that pulse power supply and I never got them going. I could never figure out what the power transistors were.

I had the Ramsey 5 watt FM exciter & also Panaxis FME-500 with 10 watt amp & they were good with a proper duel bay antenna. FCC here in the US not even bother anymore as they allow power usually up tp 1 watt pep on AM & FM. Soon if it goes through the FM band will go down to 82.1 MHz allowing more low power broadcasts as well as AM translator stations but no dates set yet.

@12voltvids

2 ай бұрын

What good will that be if radios don't go that low? I know someone that did it for 20+ years and never got caught and he ran 24/7. I still wouldn't take the chance myself as I am licensed for ham radio so getting popped for piracy would say goodbye to my ham license. My low poser stuff is strictly for testing equipment.

I see that there was space for fins in that aluminum plate were the transistors and diodes are mounted. Maybe they missed that!

BobsDecline called and said that putting a cutout under an amp is not something a lineman can support in any way. I think his idea of a cutout was a little different, however. heh

@12voltvids

2 ай бұрын

And he uses a load buster to open it.

Technics SE-C01 (amplifier, no receiver) also uses an switched mode power supply wich was in a serperate unit (SH-C01).

@12voltvids

2 ай бұрын

High end brands like linn also used switch mode.

I feel much better about my bench now that someone else has one that looks like mine .

@12voltvids

2 ай бұрын

Mine looks like 95% of real repair benches. The only ones I saw that were clean were shops that were not busy hence plenty of time to clean up every day. The last year I was at the shop I was at for 20 years started to look pretty clean in the last year I was there because most days I was done by 3PM but couldn't leave till 6PM even though I wasn't being paid by the hour. The asshole owner made me sweep all the floors as soon as the work was done for the day. Why couldn't I just leave, good question, tried that one day. Told him since I was on comission I was leaving as soon as I was done and he said fine then you won't get paid for the repairs that get picked up when I was not there as it had become my job to write up the order and cash it out.

@jerrypeal653

2 ай бұрын

@@12voltvids lol , I hear ya !

So what do you recommend on using for replacing the old conductive glue?

@RobsonWilliam82

2 ай бұрын

He mentioned silicone. Some people use hot glue, but I don't recommend it, as it softens with heat. Silicone is non absorbent and is heat resistant. Every time I apply some kind of glue to the components, I avoid putting it to the leads. Hope that helps you.

@12voltvids

2 ай бұрын

Silicone is what is used these days.

@chickenfoundation9323

2 ай бұрын

@@RobsonWilliam82 thanks, what kind of silicone? Like do you have a link for what you use or name

@12voltvids

2 ай бұрын

@@chickenfoundation9323 No links because I just buy it at the hardware store. Just regular down silicone. Not bathtub caulk, that generally has anti bacterial additives that could become conductive. Just regular silicone rubber like you would use on an aquarium.

I like to soften old glue up with isopropyl.

Hey I have a unrelated question: Why do the tape guides on VHS machines go out of alignment so often? I am currently learning about the adjustment procedure and I dont get why they are out of alignment in the first place! Edit: They still care about RF emission today, they just do it in a different way. They mostly do it with circuit design, for example by limiting the voltage risetimes and jittering the switching frequency. Its cheaper than shielding since its all on some IC. Its still a big deal for legit products, I dont think they loosened any rules about EMI. Exept for imported trash from china, its complete anachy for this stuff.

@12voltvids

2 ай бұрын

Vhs goes out of alignment because it's a shit design. Back when all the manufacturers were trying to decide on a single standard, Sony, toshiba, sanyo and NEC all decided that the scaled down version of the 3/4 umatic system was best. It used fixed guides to hold the tape at critical angles. Even panasonic and their sister company jvc was on board. That system was called betamax. Sony was chief developer on the project. There were 5 different systems proposed and everyone agreed that the beta system should be the standard. The problem was Sony wanted too much control and Sony wanted royalties for every beta maximum made regardless of who made it. After Sony made the announcement JBC went back and took one of the discarded systems and released it calling VHSAnd gave anybody who wanted to make it a license to make their own machines without having to pay them a royalty for every machine that was sold. Beta start up pretty good for the first several years however once video stores like blockbuster decided they were only going to stock one format and that was VHS that kind of sealed beta's fate as far as home format went. VHS was a half-baked format from the day it was designed and the m loading arrangement was Criticized from the get go as having too many moving parts. In my opening logo I show all the different mechanisms. You will notice the first 3, 3/4" umatic, beta and 8mm all look pretty much the same. They all use the u loading. 8mm initially did it as well but switched to m loading because it was considerably cheaper to produce dispite being less reliable.

@WolfmanDude

2 ай бұрын

@@12voltvids Thanks for all that info, its really hard to find concrete info about these devices in the internet! I have to agree that the u-loading mechanisms seem more reliable. I got into VHS simply because everything is easy and cheap to get. Where I live I would be lucky to find a single betamax player on ebay. With VHS I can choose the best model from thousands and the casettes are for free. So far I really liked Panasonics VCRs with the die cast chassis. I will disassemble one of those tape guide posts to see why they always go out of alignment over time. Maybe I can improve the design. I have a machine shop so I will figure something out. Cheers from Germany :)

@mrnmrn1

2 ай бұрын

Most late '90s - '00s VCRs have plastic base for the tape guides. I wasn't too worried about this, because I was sure they've put a brass insert in the plastic for the adjustment thread. Spoiler alert: they didn't! At least not in Panasonic Z mechanisms. That super fine thread is in the plastic, if you adjust it a few times, it will become loose. Some earlier and higher-end Panasonics from when they first released the Z mechanism use aluminium base for the guides, I was trying to source those guides to replace my plastic ones, but I couldn't. I have a Metz VF61 SVHS, it's my only VCR which does SVHS-ET, it's a rebadged Panasonic NV-HS860, great machine, but comes with those bloody plasic bases for the guides, I had to transplant them from a 2 head mono Panasonic because the threads were completely missing from them. But I was lucky it has those plastic guide bases, because that was its only fault, so I could buy it for less than 20 Euros with the original remote, while a working example with original remote usually costs between 100-200 Euros. I just checked, there's one up on ebay for 599 Euros right now, I don't think they will ever find a fool who buys it for even half that price...

@mrnmrn1

2 ай бұрын

​@@WolfmanDudeOh, I just saw the end of your second comment. So you're from Germany. Let me share with you my latest discovery of a hidden gem: Lifetec LT9025 chassis code:A. That is a rebadged Japanese ORION from '99-'01, comes with a nice mechanism with metal guide bases, 105°C Rubycon capacitors, and it has an alumina head cleaning roller which can be left in place because it actually works unlike the desintegrating foam rollers. I haven't used it much yet, but to me it seemingly beats Panasonics of the same period. The machanism certainly looks a lot more robust than the Panasonic Z mechanism. I bought it for about 5 Euros untested, and it turned out to be fully working and actually brand new! No tape mark on the pinch roller, and the head cleaning roller is snow white. I just have to find an original remote for it.

The infamouse Sony take on a switching power supply was not the best of ideas. Added to that the glue that goes conductive as it ages and caused a lot of strange faults. I have only had a few of these models on my bench but they all had the same issues as well as the thermal fuse. All the Japanese makers used that dreaded glue, i always remove it when i see it, before i start looking for other faults.

@12voltvids

2 ай бұрын

Just remember the Japanese made the best most reliable products. NOT!

@Barbarapape

2 ай бұрын

@@12voltvids I can still remember the first Sony TV i had to try and repair with only a circuit diagram (Schematic) it was like a rats nest of components jammed into to way to little space, no way could you see which number it was. All the brands were the same, if you saw a capacitor made by Panasonic chances are it was faulty. Today they make very little in Japan and outsource production to other makers who use the cheapest parts possible. I have just replaced the backlights in my neighbours Panasonic TV, made by Vestel in Turkey Despite the badge it was no better than the junk sold in the supermarkets.

Another piss-poor design from Sony...

@12voltvids

2 ай бұрын

Sony had plenty of shit designs but they also had brilliant designs.

@AstrosElectronicsLab

2 ай бұрын

@@12voltvids yes, I know. However, having said that; there have been some bad receiver power amplifier designs, where they use a large driver IC (which get pretty hot) to drive the "booster" (as they call it) output transistors. Part of the AC negative feedback system, mainly the 100uF or so capacitor to ground, they put right near the hot metal part of the IC! What happens? It dries the capacitor out over time, and then the channel no longer outputs sound (or very little). Good on ya, Sony!

Well you bought a nother unit back to life some one is going to be very proud 🦚