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- เผยแพร่เมื่อ 17 ก.ย. 2024
- Short tips. Pioneer SX-636 Stereo repair.
Buddy's Work Shop
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I love hi fi gear from this era. Sounds great, serviceable. Thanks for taking the time to make a video of this Buddy.
Thanks for watching Richie.
Thanks for explaining the reasons and ranges of DC voltage getting to the speaker terminals. I restored my dad's SX-450 a couple years ago by shotgunning anything obviously bad. I was getting 35 volts to the terminals because the power transistors were all blown. In the end I replaced the power transistors, all the electrolytic capacitors, and a few other transistors that were acting weird and sending odd noises through the phono preamp. Zero of my factory Elna brand capacitors tested bad. They were probably all just fine. I actually own an original SX-838 which is a great receiver and it's completely original and hasn't shown any issues yet. I know that the amps have a reference voltage DC out to the speaker terminals around 1mv after everything has been biased and set by the book. I barely know what I'm doing, but little videos like this help shed light into the darkness over time.
Thanks for sharing your repair story. You do not have to be an expert to repair, just know what to replace and why. Hope these typs of videos do help in some way. thanks for watching.
The tips were great. That receiver brought back good memories from the past.
Thanks Buddy.
Good to hear Mr B. Thanks for watching.
No finding these for under $140 for parts even. They are plenty loud for an average house. Great audio quality, thanks for taking the time to show this gem of a receiver.
At one time I would be glad to repair any old thing but certainly the ever increasing cost of components makes be think long on hard now before taking on a project. Thanks for all the videos over the last year and wish you every success for 2022.
I do agreee with that comment Chris. Some things are not really cost worthy of a repait. Like the heathkit DX-20 I featured a few years ago, just too many problems to restore. Thanks for stopping in and good luck with 2022
I have an SX 525 bought new around 1972. Been in storage a long time, new condition. Fired it up to use in garage sounds good. Possible channel imbalance on low power FM, noisy switch. Good enough to work on my 1970 Cadillac. Also low hours. Using my old Advent speakers from the late 70s.
Audio equipment from the 70's... I love it. Very nice video, Buddy! Thanks for sharing, and happy new year!
Thanks! You too!
This is a great service. If I ever find a sx 636 I will know what some of the common problems they have. This will help in knowing what kind of expenses to expect/repairs.
I owned a SX636 served me well into the late 1980s.
They were good old units
Sounds like the perfect project with the 8582D soldering station I ordered!!!
I have an SX-737 that I purchased new back in the '70s when I was a much younger man. Like me, it has a few issues due to its age, but in general is still working well. Thanks for these tips - they'll probably take care of its issues. I wish my age issues were so easy to correct!
I know what you mean Rick. We are getting old. Thanks for the comment.
Buddy is spot on! I have redone about 10 70's vintage receivers. I have probably changed too many electrolytic caps. Change the electrolytics in the power supply, the protect circuits and the power amp.
Buddy is right about the big caps in the power supply. I change them but probably did not need to.
I just fixed a SX-1050 for a friend. (1 small power supply cap was bad) I got to about 60% of the e caps in the entire unit. The rest I left because it would have involved more disassembly than I wanted to do. (dial cord)
My pal is more than happy because the unit had started to hum. It rocks now.
Thanks for sharing.
I just subscribed to your channel after watching this #269. I've watched a ton of electronics repair videos, but none as well done as this. The level of detail and explanation of the how's and why's gives a total novice like me a much better understanding of the workings of vintage electronics.
Thank you for this channel and outstanding series of repair classes.
Awesome, thank you! I appreciate comments like this. it is my goal to make electronic repair simple and easy to understand.
Thanks Buddy for the tips. I always learn some good troubleshooting skills.
Glad to help my friend
Thanks for the good tips, Buddy! 73, N9WHH
Thanks for watching
Great tips Buddy, thanks for the video
Thanks for watching Bill
I like this idea. I always enjoy your videos. THANKS!!!
Glad you like them!
That's a nice stereo. Good that it uses standard speaker terminals too.
Why I liked these units. Easy to use and repair!
These short tips videos are great! Keep em coming for all us fans cheers
Love this short video, especially about vintage pioneer equipment.
I’ve repaired many cracked solder joints on the power supply transistors. Heating and cooling gets them. Thanks
Heat gets them every time. Thanks for watching.
Seeing this stereo brings back some great memories. I miss it.
Ok Buddy, now you've gone and done it...you're making me pull my 1977 Kenwood receiver and cassette deck, Pioneer turntable and Advent speakers over to the workbench and get them up and running again...heck, they've only been out of service now for maybe 30 years! ;-) Another project, sure am glad I'm retired or I'd never get anything done! 73 - Dino KLØS
LOL, Time to get it done Dino. Should be a fun project. Working on them is relaxing. Thanks for stopping by
The Advents will need to be reconed. Still considered one of the best speakers made especially for the money.
@@rogersmith7396 Thanks, they actually were reconed but it may be that they've deteriorated again and need to be redone. Thanks for the tip!
@@PapasDino One of my large Advents was lost/stollen in shipping and I had to build a new one. Got the schematic for the cross over and built one. They say the tweeter is the most critical part of the design. I used a hemispherical one like the original. 1 inch I think. The box is stuffed with foam. I have small advents on my boat. Have started to use my SX 525 from the early 70s while I work on my car. New condition. I have various things that need to be recapped but frankly I don't have the patience including a Revox A 77. Parts used to be cheap.
Yup, DeoxIT Fader F5 is the way to go!
Here is a weird story on one of these receivers I was working on. The unit was unplugged, I was testing the ESR on the 3.3 uF Sanyo capacitor, which I did make sure was discharged, and the alligator clip of the ESR meter popped off of the negative lead and hit the case of that metal bodied transistor that is right next to it, shorting out the case to the base. There was a pop when the stored charge of the 220 uF power caps caused the current to surge to the downstream driver transistor and short it out collector to base. Didn't see that coming.
Excellent tip info. Keep'em coming, Best wishes for you and your family in the new year.
Thanks and same to you
Hi Buddy, 4:30
It looked like you had the negative test lead connected to the positive speaker terminal and the positive lead to the negative terminal.
I checked ebay and the average asking price for a 636 was $175.
I'd like to find one for $60! lol I still use my Technics SA-1010 in the living room and a Sansui 8900Z in the back room paired with some Pioneer HPM-900's
Thanks for sharing. I hope to see more stereo stuff in the future.
Hi Darryl. Yes they are connected backwards, in this case using a DMM really does not matter, what is important is the voltage reading. That was probably the guy I mentioned. A few weeks ago there was one on there for $45. Should had bought it. Thanks for the comment.
Love the short video theme. Always learn something new. Thanks Buddy
Go check those eBay prices again 😂, lucky to find one for under $300 or so, as-is with nothing done to it. Great video btw, very nice of you to give your experience on these old machines. Especially helpful when you pointed out which caps were likely to go bad as opposed to just replacing all of them. I have a 636 myself that I'll be restoring soon. I've got your video saved :).
Good tips Buddy. Thanks for sharing them with us. 73 de K7RMJ Frank
Thanks Frank
Picked up 1 for 25$ Canadian on Facebook market place. Saw an ad for a turn table seniors downsizing paid 50 $ for it. While I was waking out lady asked me if I wanted a receiver by any chance I said maybe depends on what it is. On the floor cover up was a SX 636 would I give them 25 $ for it as they were worried my be to loud for their next place. Told them it was worth more but they were happy someone would actually use it.
Great stuff!
👍👊😎
Thanks 👍
I am studying electronics and have a lot to learn yet, but I want to learn how to work on vintage gear . I have a SX 450 that I have had for a long time I want to tear it down and put it back together to learn on. They don't bring much money about $200.00 I am not worried about destroying it. I bought two cans of detox for the job. I do want to replace all the caps on the unit and clean all the pots. I wish you would make a video on testing caps and replacing them when you get the caps for the unit. My unit was rock solid and never let me down and it would thump the Marantz speakers I hooked up to them. I bought refoam kits for the speakers that's another job I have never done I want to replace the caps for the cross over also . I so want to see an update on this unit
Thanks Rodger. There are already a ton of videos on cap replacement. When doing so pick one board at a time. Take plenty of pictures and not which side ground goes to. After replacing caps on one board and double checking you work, power the unit up and test that it is working correctly and no issues. This way if you have a problem you nknow it is in the board you just worked on. Once you are satified that everything is correct and working move on to the next board and repeat the process. When I get the caps in stock I will do a follow up tech tip explaining all this.
@@TheRadioShop When you get it recapped can you do a power out put test with your meter before and after so we can see what the proper voltages are? And yes please show step by step removing control boards and replacing caps. I bought an NOS Radio Shack electronic kit to show you how electronics work and build on the bread board . I did one circuit with a flashing LED when you push the button on the board, I still don't know how all caps resistors work etc but hopefully I will learn. The kit was from 2000 and it was all NOS . Thanks for the advice and reply
Thanks for the tips, I have a pioneer qx8000 sooner or later I gotta see if I can get into that was running great and then lost some speaker outputs
Thanks for watching Tony. Let us know what you find.
Thanks Buddy 👍🏻🇬🇧
Hey Buddy, happy 2022 nice unit. I have a Pioneer 838, they sell on ebay at rite around $ 600.00 rated at 50 watts per ch. [ Keeping mine ] - with a right channel issue, which as I was telling 12volt videos, it was my faul, did a no no with a speaker connection. I like Pioneer older units, many around built well discrete pieces, nice heatsinks in them ,temp cutouts ect.
Thanks for sharing that. hope you can get it sorted out. Shorted output transistor?
I shorted speaker leads once, blew the outputs. Replaced them, no problems.
I like the new short format, It'll keep me going while you make the longer videos. What's the potentiometer cleaner you mentioned? I'm looking for a good safe cleaner that's available in the UK and doesn't eat components or delicate plastic. I've already got some got Isopropyl Alcohol, both liquid and spray, is there need for anything else?
That would be caig deoxit fader f5. It is really safe for linear audio taper pots. Not sure if you are able to get it in the UK. Careful with IPA unless it is 99% as anything lower has a water content and leaves a residue. Thanks for watching.
So far it seams that my Marantz 1060 amp still is working. Still makes my B&O 2600’s sound pretty good as well. Thanks for the post
I wish I could get my Pioneer cd changer player working again!
I fixed a CD by adjusting the laser power up. Easy peasy.
I love your videos. I collect Pioneer and other vintage stereo receivers. And also have, yes, a little Hallicrafters collection, the complete 1946 line up. The SX42 is my pride and joy. Did your customer that you helped with his SX42 ever decide to have the cosmetics done?
Sounds like a nice line of Hallicrafters you have. He decided to keep the old look to the unit. Thanks for stopping in.
@@TheRadioShop I went all out on my SX-42, as it was purchased brand new by my late father. Also have his matching R42. And his S38 and S40, all recapped and restored. So proud of the collection. Keep the great content coming!
Hello,
1st time viewer and I subscribed as I'm very much hoping to see and learn more about service / repair of vintage audio gear.
Thank you for your work and effort's and I look forward to more extensive coverage in this area.
Regards,
Jack
🎉Thank you!
I always prefer a before and after. Love to see how stuff is acting, the repair, and the finish...
25 bucks at the salvation army 30 years ago ... had it gone through sounds great
Introduced in 1974. Not '76. I bought a brand new SX-737 in '75 and lost it in a house fire in '95 so I bought another one.
Good tips! Most of us know that bad electrolytics are very commonly found in old equipment. But one thing that I've always wondered is are they bad/leaky solely due to old age? Or do they become bad only because they have been POWERED for a long time?
Good question. Capacitors do dry up with age, even unused. I have some NOS caps that check good but would not trust them under load. Powering them up and down over long periods will eventually get them.
@@TheRadioShop I would assume we are talking about dielectric breakdown. Lightning is the dielectric breakdown of the air gap.
Yesterday I saw an ad that advertised radio for sale one dollar volume stuck on high. Thought I can't turn that down
Drives me nuts seeing guys on other channels just dragging a vintage piece across a dirty cluttered bench.
Hello and thank you for this very informative video. I just got a 636 from a family member and realized that the "Function" potentiometer is crooked. Do you know where I could source a replacement for this?
Thanks. About the only replacement I know of is from a donor unit.
Were you able to get enough slack on those wire wrapped leads running to the power supply board without having to remove any? The board with those 220 uF caps x 3.
Alot of the same things apply to the SX626 model? Ive been having issues with mine where almost all of the output is completely missing on the left channel. Ive tried cleaning everything a few times. Havent overlooked the solder. Probably caps but alot of these cap kits for these units now are 80-100 at the minimum. Im debating on fixing and keeping it or putting it on the side as a parts chassis and gambling with another. What are your thoughts?
Love your channel by the way been subscribed for many years.
I have an IC745 trransceiver that needs a complete recapping. Do you know somebody that can do this for me?
At the moment no. The problem is finding the 12 pf trimmer caps that will fit in the VCO can. The original style has been discontinued. I am searching for an alternative.
Tengo uno cuanto valen entero el modular
Those gray electrolytic capacitors need to go.
Yes, they all need really go.
My SX -636 all the sudden don't have any sound coming out of the speakers, can anybody help me fix it?
where are you located and how can I get ahold of you
$40-$60.................More like $125 - $175
Yes for a working unit, I agree. Keep an eye for tech specials.
@@TheRadioShop The ebay magic word is Japanese. Worth a lot more than chinese.
Between 40-60 bucks...on what planet