Back to Basics Service - Pioneer SX 3600 Part 3

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Күн бұрын

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@xraytonyb 3 жыл бұрын

0:16 Testing the amp with some music; Making sure the controls are not noisy 3:55 Review of the alignment instructions 9:57 Checking and adjusting bias current on the output of the power amp 19:52 Comments after making the bias adjustments 20:37 Calibrating the power output meters 22:29 Notes on audio signal sources for the adjustment (Audio Signal Generators) 26:36 Choosing a "Speaker Dummy Load Resistor" 33:39 Calculating Watts using your multimeter 37:08 Tools required for basic amplifier service

@robertfitzgerald3432 3 жыл бұрын

Fantastic basic tools-instructional learning presentation, Tony! Thank You.

@2tallB 8 ай бұрын

This was very enjoyable, thanks for doing these! I’m only mid-level with this stuff but, boy, do I ever wish I had seen this when I was trying to figure this stuff out by taking notes from vids, forums, books, etc. You covered a lot here and you’re an excellent teacher! 👏🏼👏🏼

@philipbrown7196 18 күн бұрын

Thanks Tony, great video, just the basics and uncomplicated. Also, it's so nice not to have the adverts all the time. I really appreciate your time in making this video.

@jeremiahchamberlin4499 10 ай бұрын

Great series, tightly focused on getting started in electronics.

@alexw890 Жыл бұрын

This has been a really helpful series. Thanks Tony!

@TheTrueVoiceOfReason 3 жыл бұрын

Thanks Tony. Great series that really looks like it can get newbies to the hobby excited enough to not be afraid to try their hand at repair. I also want to extend a virtual handshake and congratulations on continuing what your cousin did for you all those years ago to get you into electronics. Kudos to you and him, by proxy. Keep on being you. 👍

@poormanselectronicsbench2021 Жыл бұрын

A usable " in a pinch", or starter audio signal generator can be a smartphone or tablet with an app (there are many out there) that can either be direct connected to an earphone output and adapter cord, or, by using a bluetooth adapter. I have 2 receivers that I normally BT connect to my phone for music, and I run a ASG app now and then if I feel I need to listen to something that needs adjusting or checking for signal quality with a tone instead of music. Informative content, thank you for sharing!

@fredfabris7187 Жыл бұрын

Can use a KZbin video of 1k sine wave

@1982travm 2 жыл бұрын

You have given me the confidence I need to get started. I gave up a few years ago because I got overwhelmed. I'll start simple and build on this. Thanks again Tony!

@Theoobovril 3 жыл бұрын

Top dog, Tony, a great series of videos on the SX 3600 repair and servicing.

@jimbo141 3 жыл бұрын

This is by far the best “receiver maintenance 101” series I’ve come across. Thank you for sharing your knowledge Sir. Off to check some popping transistors. Cheers.

@mattking4267 Жыл бұрын

Thank you! This series was very helpful! I’m just getting into vintage audio restoration.

@schorse1000 3 жыл бұрын

Again, this series was super helpful, since I have an SX-3800 that needs to be restored one day.

@teresitamontebon5342 2 жыл бұрын

I’m enjoyed your videos my hobby electronics thanks have a great day

@carlveilleux5744 3 жыл бұрын

Thanks Tony for the SX3600 videos. I know you wanted to only do basic tests on it using basic equipment (and I appreciate that) but would you be interested in making a short 4th video showing more advanced tests like distortion and power measurements, as a SX3600 owner I'd really like to see this. My speakers are 4ohms, I'd like to see what power the 3600 can actually put out in 4ohms, as this is not disclosed in the specs.

@TheTrueVoiceOfReason 3 жыл бұрын

Carl, you can get a rough measurement by using your speakers, turning it up until you hear distortion and then backing it off just to where it clears up. Then measure as in the video, square the RMS and divide by 4 for the wattage. Like I said, it's only rough, because you are using the reactive load of the speakers and their own inherent distortion as well as the amp's distortion in addition to your own ear's distortion curve. But if you're very deliberate about it, you can get pretty close. If you want to really know, you'll need an o'scope and nonreactive load bank to get it accurate. Tony has some vids that show how, and JohnAudioTech shows how quite often.

@carlveilleux5744 3 жыл бұрын

@@TheTrueVoiceOfReason Thanks for your answer, interesting! Yes I've seen Tony do it with a scope on other units. The only test I found which the SX3600 could probably be compared to is a SA6500II restoration thread on AK. The 6500II is an integrated amp of the same era with very similar design & specs as the 3600 (at least by the look of the internals) and has the same 30W/c rating. Under test it was measured (just under clipping) at 35W/c in 8 ohms and 43W/c into 4 ohms, so it looks like the 30W/c rating is conservative. Not that this really matters much to me, I was just curious about it, this thing plays plenty loud with the volume at 4 and I like the clean warm sound of it. Thx again!

@davidstart1748 3 жыл бұрын

Well done and to the point,keep it simple!!! Thank You

@jharp53 8 ай бұрын

Hi Tony. First, thank you for all your great videos. Repairing audio equipment is my new hobby since I retired, and your videos are really helping me figuring this all out. I am going through my Marantz 2252 right now, and I was looking for info on those orange Elna cap replacements, which you gave us in this video. Now my question is what do you feel is a great replacement for the light gray Elna caps. Also, what is a good method on figuring out which caps in a circut are for power and which ones are in the signal path. Thanks again for all your help and keep the great videos coming.

@curtismuma1931 3 жыл бұрын

Great work !

@martyh9309 Жыл бұрын

I really enjoy your content and I am catching up on your older content. However, I do have a comment on bias. In a push pull amplifier or one that runs in class a b, the higher the bias current the more power the amplifier will deliver without having crossover distortion. The higher the bias current, the more the pair are turned on so they will be supplying power up to the point they are turned on and basically pushing against each other at that point. Once they supply power beyond that which they are turned on with bias, then they truly will be switching between each other and that's where you will see crossover distortion. So basically when an amplifier is running within the point where both transistors are conducting due to the bias, the amplifier is running more like a class a amplifier that will never show crossover distortion. Once a class a b amplifier moves into class b function where each half of the amplifier is then producing pure power beyond that which it is biased to, then it will be actually showing crossover distortion. So basically an amplifier with a lot of bias will sound better at low volumes than an amplifier that has very little bias at those same low volumes because the amplifier with a high bias won't be producing crossover distortion until it starts going into class b operation which will be at a higher output than an amplifier running with a low bias.

@scottjarvis5485 3 жыл бұрын

love watching your videos, I don't do much servicing work I mainly build guitar effects pedals but I find your channel very informative and well explained I love the long format and schematic explanations also I thought you were great in the film jaws 🤣🤣

@bellittimo 3 жыл бұрын

Good 3 lessons Tony!! Grazie!! I look forward to the next step 😍

@sandraledger2612 3 жыл бұрын

Cool Sounds!

@garygranato9164 3 жыл бұрын

thank you for this great video

@keybutnolock 3 жыл бұрын

Great stuff, thanks for your work. Solder wick : - the screening from coax with some flux will work, while you're waiting for Mr postman. Signal generator : - most music editing programs will give you single frequency tones, so maybe you could use the output from that with a test meter to check levels.....

@tubeDude48 3 жыл бұрын

Tony. I would have removed the dim-light before adjustments.

@markanderson350 3 жыл бұрын

Agreed on most all your points. The power meter is just a toy really but it does give you an idea if you are about to clip. The bias is quite important, yes the distortion can be heard at quiet levels, too high, it can go into runaway but that's way high. the front end on many of these are out throwing off the dial calibration. I do agree, better not to touch it.

@mr.salisbury2435 3 жыл бұрын

Great stuff. I realize this unit has a transformer but wondered if an isolation transformer should be on the list or at least mentioned for beginners in case they try to extend this to hot chassis devices like old radios etc. It was one of the first things I got when starting the hobby

@mr.salisbury2435 3 жыл бұрын

I sometimes just use one of those plug in gfci protectors when poking around in stuff around the house

@xraytonyb 3 жыл бұрын

Most of the receivers that use a power transformer already have isolation through that transformer. This is why it is safe for them to reference the ground or common point directly to the chassis and allow the chassis to be exposed. Hot chassis sets, however, have one lead of the AC mains cord directly connected to the common point of the unit. This is why they are usually physically isolated by either putting the chassis inside a non-conductive cabinet or by keeping the common point up on terminal strips. This way, you can't come in contact with the power supply unless you open the unit and touch inside where the chassis is.

@mr.salisbury2435 3 жыл бұрын

@@xraytonyb Thanks. Since this video was targeted at beginners/minimal equipment I just thought it might be worth mentioning. I actually started with hot chassis radios so the first thing I bought was a small isolation transformer since you do have situations where you do have to test with the chassis exposed. Both you and Mr Carlson have done great videos on this , as well as repeated reminders. Again no fancy set up needed, my dim bulb unit looks like the one you made. I don’t get enough bench time sadly to make a more convenient unit worth it

@mcsniper77 3 жыл бұрын

The UT211B is a little more but does more. I use mine daily and can't imagine not having it. Thank you for all your great videos Tony. I do have a request, do you think it's possible to do an FM alignment with ADF4351 Signal Generator Module 35M-4.4GHz RF Signal Source?

@rogerknapman1260 3 жыл бұрын

Tony, the pushbutton switches on these units are a common failure point. The physical detent breaks, and they will not stay in the depressed position. These seem like a common 4pdt switch, albeit with very long pins. Where to souce or how to adapt?

@carlveilleux5744 3 жыл бұрын

Look up AudioKarma, there is a thread on this subject where "extensions" where soldered to the pins.

@johnnytoobad7785 3 жыл бұрын

These last three vids are proof you DON'T need a lot of fancy test equipment to perform basic test and repair. However I still like old school CRT based scopes for audio work.

@greengrayradio1394 3 жыл бұрын

Nice again, Tony! I would comment one one thing: Some of the cheaper multimeters have a limited frequency response on the AC ranges (mostly suited for "power line frequencies") I have seen they can be far out of spec especially over 10kHz. But 1 kHz is probably ok. Btw, I also have the exact same UNI-T meter as you, but haven't tested its freq response. I will try that :)

@xraytonyb 3 жыл бұрын

I believe that clamp meter is accurate to about 60kHz.

@greengrayradio1394 3 жыл бұрын

@@xraytonyb Tested just now my UT210E with an AC mV meter as reference. The -3dB cutoff point was at 3 kHz

@xraytonyb 3 жыл бұрын

That's good to know. They don't give a lot of info, but I read somewhere that the upper limit was 60kHz. I think selecting VFC mode makes it more accurate, but only at lower frequencies (below 600 Hz). I'm not really sure, as they don't have much documentation on this model. Thanks for sharing!

@greengrayradio1394 3 жыл бұрын

@@xraytonyb Many Fluke DMMs among others are good well above the audio range. I would check each one first, however..

@jackgabbert3233 3 жыл бұрын

Hi Tony, Ok, OK like a lot of others - Thank you!!! This series has been very helpful !! and since I'm at that just starting out phase, couldn't have been better timed. So new viewer and subscribed. Now please help me to understand the different sections of the receiver and relating the schematic to the actual unit. Best Regards, Jack P.S. The little tips on component ID and known problems - pure Gold!! Please include more and where to find suitable replacements.

@michaelscottcutler3627 3 жыл бұрын

As I've written in your first video in this series, I have an SX 3700. What differences should I be looking for in this model, compared with the SX 3600?

@xraytonyb 3 жыл бұрын

The 3700 has a better tuner and outputs 45 WPC instead of 30 WPC. The input of the power amp uses a current mirror at the diff input stage, but the rest of the amp is similar. Really nice unit.

@michaelscottcutler3627 3 жыл бұрын

@@xraytonyb Thanks, Tony. Glad I found you. Enjoy your vids.

@gymee425 2 жыл бұрын

i have one of these receivers and would like it inspected and repaired if needed, do you know who, where , can this happen? thnx

@carlveilleux5744 3 жыл бұрын

I understand the power meters are calibrated to display the approximate power output under an 8 ohms load. What about when 4 ohms speakers are used? Would the output power be twice what the meters are showing? (I know speaker impedance is not constant and varies with frequency).

@Chuck-U-Farlie 2 жыл бұрын

Im wondering if those two bias jumpers could be replaced with trimmer resistors in order to make the bias adjustable.

@mangist 2 жыл бұрын

Yup!

@questionmark9684 3 жыл бұрын

Hi Tony, I have two questions about resistors: The ceramic one states that it's non inductive, but what about the 300W golden one? I have a similar pair of 200W resistors and they measure 4.6ohm on the DE-5000. Second, why do resistors have a rating that they can only be used at that power setting for such a short period? Thank you. Cheers Mark