0x001C - Pioneer Stereo Receiver Restoration
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- čas přidán 9. 02. 2018
- I got this Pioneer receiver for next to nothing. All it needed was a little help to get back to into good shape.
The SX-424 isn't a show stopper, but it has some charm. 12Wpc is definitely nothing to brag about, but with some reasonably sized speakers it does a good job. It's not replacing my Yamaha RX-V365 anytime soon though. - Věda a technologie
Wire wrap is a thing. Yes, there's a machine. The corners of the posts bite into the metal of the wire (if it's done with the proper amount of tension), which provides a very good, crimp-like electrical connection, as well as physical sturdiness.
Bought one of these in '79 - '80 at a flea market. Someone had tried to repair the amplifier section and screwed up burning a huge hole in the PCB. My neighbor and I were able to properly repair and I used it til the early '90s. I gave it away but always loved it. Before my son went to college I found another for him, we went through it and paired it with a set of B&W speakers. Sounded amazing. He still has it. I currently have a Pioneer SX-980 that I will be recapping soon.
I am trying to learn electronics I have a 424 that I have had for years I got it back in the early 80s at a pawn shop after I had my house broke into and lost my stereo system I had a ken wood amp with Kliphs Hersey speakers sorry spelled that wrong anyway I want to recap the whole receiver to learn but I see the main board you cannot get out with out taking the string off. Any ideas ? I never restring and it looks awful to do any advice they are not worth much so not worried about screwing it up.
Those wires wrapped around posts ARE done with a wire wrapping tool or machine. I have hand wire-wrapped thousands of those on backplanes. The posts and wire were much smaller, but the concept is the same. A large machine is used to install the wires on a large, complex backplane, but I have made many, many hand modifications after the manufacturing process and I have also hand wrapped complete smaller backplanes for engineering models (perhaps 800 to 1000 wires). The hand wrapping tools were mostly battery operated and made by Gardner-Denver, but I have also hand wrapped using completely manual tools on smaller jobs.
Those wrapped wires are something that was quite popular back in the day, especially for prototyping. Look up Wire Wrapping on Wikipedia.
I'm familiar with it as a prototyping technique but I had never looked into it other than that. I'm surprised that they would use it in a product, but if it was good enough for space travel then it's good enough for a radio I guess.
AkBKukU check out the Macintosh Prototypes article on folklore.org for a fun read on wire wrapped madness. Check out the other articles while you're there too, it's good stuff.
There is a little hand tool that looks a lot like one of those jeweler's screwdrivers which lets you tightly wrap wire around the posts. It makes a surprisingly secure connection.
If you ever get the opportunity to open an old Pioneer RT-909 Reel-to-Reel player, nearly every wire is routed and wrapped on posts between boards.
Wire wrapping was important for a proper connection as opposed to just soldering on as it provided a gas tight connection for better signal transmission. The Audio engineers knew their stuff don't worry.
My first receiver back when they were brand new. Only had it a couple years.
My first receiver was an SX-434 in 1974. With a BIC 920 turntable and KLH model 31 speakers, all for under $240.
I can’t be the only one posting on year old videos...
I knew that was a variable capacitor from watching Mr Carlson’s Lab. I know vacuum tubes aren’t interesting to everyone, some argue anyone, but my Grandpa fixed radios in the Philippines during WW2 and I was curious... I still watch his channel.
I did wirewound prototyping in EE school circa 2000 on perfboard... maybe my professors were old school but when you only need 10 and pcbs were $35 each. We built the circuitry for the automatic apiary feeders on top of the biology building. They do/did make a tool for it, looks like a nut driver with a slit on the side of the socket.
Those speaker terminals are very typical on those very early 70s Pioneer SX receivers.
My SX1000TW also has the socket type arrangement too. They usually come with the plugs, but sometimes people lose them and you either have to make your own or just buy replacements.
Yours is also an export model with the multi tap voltage selector.. Nice !
The four tape connections are what allowed tape decks to play through the receiver and record from the receiver. Wow, definitely old school.
this was so painful. thank you for letting us enjoy this AkB. that was a modern Perseus. Who knew radio tech was so complicated??
I have had one of these receivers for years I need a volume switch it has been and excellent unit good job
The face plate and knobs can be soaked in warm dish water and then use an old tooth brush to agitate the crud out of the grooves. The face plate can then be followed up with some metal polish. The silk screen is safe, it won't rub off.
Then it will look amazing !
i seem to remember that my parents had this exact model of stereo in their living room in the 80s, until it didn't have enough inputs.
Replaced a bunch of blown light bulbs in the front panel of my SX-535 receiver, and no, there were no proprietary connectors on that model (230V, Europe)
It sounds very nice !
To get one of these to do 4 channel, you would need two of the same model, and a separate 4 channel decoder. Pioneer also sold all in one 4 channel models.
You can get the service manual for this and other like it from HiFi engine.
It's free to sign up and then access all the models you desire.
Very cool man !
Tanks you so much for your video, my sx-424 is now OK ! I just have to change some lamp and it will be perfect :)
Carry on my wayward son... there will be peace when you are done.. lay your weary head to rest.. dont you cry no more....
that deoxite is like porn for electronics
love the channel. i subbed. I have a Sansui unit like this where I didn't want to touch the tuning thread just like you did. I'll have to give it another look and see if I can reach the pots in the same manner. I did have it serviced but the pots are either damaged or need further de-oxit.
My dad has one. I like the sound!
You like the weight of the tuning know then try an SX-1050, 1250 or 1280.
Very satisfying indeed. My 6 year old always plays with it and has no idea what it is or does lol !!
I got one of these for free. Nice little unit.
Only $6?? I want to find something that good for that cheap
THE ROAD SO FAR
This is my everyday companion! Too bad I hoped you would have changed one of the lights behind the panel, I just can find any tutorial on the internet to disassemble it. Thx from France for this intersesting video anyway! Ps : Nice final fantasy theme in the end!
Dude, I have been watching your videos and I love your side comments, like your comment at 10:37 is a gem!
A question: Where do you find Deoxit in a drip container? In a quick Google search, I only found spray cans.
I have this same receiver. Going from mono to stereo, whichever speaker I put on the same channel goes extremely quiet. Would this process help me out?
Yup, speaker connection on the Pioneer SX 20 series was a dumb idea. Otherwise this is a great den or small room receiver. Lotsa good features; center channel tune meter, mic input and tape loop, four speaker (4 ohm capable), stereo/mono and loudness control. I use an SX-434 in my kitchen system and it powers a Nakamichi BX-1 cassette deck and Boston Acoustics A-40 speakers. Ain't gotta spend a bunch of dough for good sound. Nice video, very interesting.
So you have a receiver in every room of your house?
Whatchu rock in the bathroom? haha
@@VidweII- almost. I set up the kitchen hifi so as not to interfere with my wife working from home during Covid. She took over the dinning room as her office so I couldn't play the "big stereo". I can get pretty loud in the kitchen and it don't bug her. Have a Sanyo C-4 boombox up stairs in the den, a Highwave six band radio in the cellar, a portable Grundig YB-400PE table radio in the kitchen and a Panasonic boombox for the yard or front porch. Still have a Sony Walkman WM-4 packed away. And I have a waterproof (Pollenex Splash Dance AM/FM) portable radio in the bathroom so I can shower with Zappa.
There was a wire wrapping tool and wire wrapping was used on space capsules way back then cause the lead in soldering created to much weight in the space capsule and a good wire wrap was supposedly as good as soldering !
got the same amp and mines a rotel, how strange is that inside. But it does happen on few occasions.
Final Fantasy's Prelude theme??? Huh pleasantly surprised.
I opened it one time and gave up because of a lack of knowledge. And no I see that and... Maybe it'll be a lack of motivation next time (tomorrow?)! You're funny tho! Great video, thank you!
What was the music at the end?
it has a concentric balance control, not weird to people that are familiar with 70's / 80's stereos
I have the 424 , thank you for Video
In the back you could put some resin in the samaged part and put some weight against it, to sort of glue it together. And the resine/glue would occupy the empty spaces.
Btw, i didnt know that still there were fm radio stations in the usa.
We in the US still have radio stations. I myself listen to the radio when I feel like it.
Mr.smash 69 Wow.. I really dont know who told me that, but i had the information that in the Us, am radios were dead long ago (as it is here too), but fm died too. And the radio stations were 100% online using internet. Same for analog tvs, that died recently here in Brazil.
Ryan Stenz Officially? Or homemade radios? Here in Brazil we dont have big am radios anymore (i think), is been a long time since i saw a am-fm radio. There are only fm radios here now being manufactured and selled
Nope, official radios. Even brand new cars have stereos with built-in AM tuners. There's only a handful of AM stations left, but those that are around remain mostly because of the FCC's arguably backwards regulations on transmit power. The FCC allows an AM station that's had a license for 50+ years to transmit at high enough power to just about cover the continental US. FM regulation usually limits their transmit power to a 100-200Km radius, again depending on the age of the station's license.
11:20 -- it's wire wrapping. Just how you think it is. en.wikipedia.org/wiki/Wire_wrap
I have one, its great but when i turn on, in speakers always listen one short sound like power and after that its normal....is it normal?sorry for bad english
They sure don't make it easy to clean the pots, I'm just leaving my sx-424 the way it is, I just flipped it up and sprayed deoxit right down in the tape monitor button and the other two, didn't have any problems with rest of the pots not scratchy and the deoxit seemed to work on the tape monitor switch,sprayed above and below the switch after pulling the knobs.
Oh man, what a truly beautiful final fantasy nostalgia trip at the end. Thank you so much for that akbkuku. Made my morning ☺️
I can call the model lx 626 my own and its like this one, just a bit more technical xD
very nice
I hated working on old stereos because of the string related to tuning and the tuning indicator.
This is the link to the manual
www.manualslib.com/manual/888645/Pioneer-Sx-424.html
5:19 - that's a variable capacitor :)
Discharge the capacitors or you’ll smell burning skin! After you wake up. Lol
Casualmente tengo ese mismo modelo de Pioneer pero tiene un problema que tiene un ruido fuerte en las salidas de audio y no he tenido dinero para enviarlo a reparar con un tecnico,
czcams.com/video/ST86JM1RPl0/video.html
The song for testing broken amp, always.
alexv182 I thought you where going to rick roll
I had one like that but with an 8 track player, IDK what happened to it...
was it a monteverdi?
found the Manuals yet b.c. i have them i believe
Sir the four tape connectors, as printed above one set is "rec" these go to the tape input to record the receiver output. The other two are tape in to "play/listen" to the tape output.
Does anybody know the name of the song that's playing at the start? I've never had the chance to Shazam it [my phone's mic is broken] 😣
Everybody wants to rule the world - tears for fears
@@TheyreStillOutThere OOOOOOOOOOOO BOIIIII THANK YOU EVER SO MUCH I've been trying to find it for more than 20 years now 🤯 damn
Red deoxit degrades carbon potentiometers. Use green fader deoxit instead.
lol 7:43 that oh yay were in then oh shit theres more
11:22 en.wikipedia.org/wiki/Wire_wrap
Awesome forgotten techniques for creating prototypes
and yes, btw there is a wire wrapping gun!
Why not building in those red/black standard connectors? Then you'll never have issues with any type of wiring. & while @ it; replace old lamps with led's? That big metal piece is not ugly; it is a big vari-cap indeed for tuning. Superglue the fan back & it will do great again. Brasso is perfect 4 knobs & connector contacts. Namasté
I literally saw this in the trash but I now can’t get it because The trash is removed
ayyyyy
I'd rather get a Heathkit receiver. Id be happy to pay over 100$ to get it as well...just because they are so easy to maintain, as well as being very well documented.
7:45 lol
Will ferrell guest appearance at 14:10
7:30 GOT EEM
I can't believe you can get stuff that cheap at thrift shops. God they're so dumb selling stuff like that for a measly 6 bucks !!
If they had 100 vintage receivers for 6 bucks each I'd take them all hahaha !!!
all the ones near me started going on ebay for prices and overpricing everything that looks remotely interesting
Um yeah, it's called wire wrapping. It's a much better way to attach wire to the post. Very common.
sounds good but your speakers sound boomy
this guy needs to stay out of these old stereos he will just damage them further.