Outstanding. Thank you Tony for all you do here on you tube. I'm that guy your always taking about that is just getting into this hobby and I have began setting up my bench and gathering equip and inventory. Between yourself, Mark at Blueglow, Paul at Mr. Carlson's lab, Dave at EEVblog, and others Uncle Doug, etc . Not only am I learning, but am also enjoying learning about something I have always feared. After a back injury I found myself getting out of auto restoration and trying to find something to replace it with as I draw closer to retirement, I think I have found it. Thanks again a viewer and friend in Colorado FB..
Hi Tony. I’ve received one of these receivers for restoration/repair and your video series has been an absolutely incredible help. The one I have is probably the only one on the island of Madeira, and one of only a handful in the whole of portugal, so i’m really honoured to have it to work on and present on my channel, but your help has been invaluable. I plan to mention your channel and this series on my videos on this project, and just wanted to ask if you’re ok with that. Once again, thank you for this series, and all the other amazing ones you’ve presented and I’ve seen. All the best, and regards from Madeira. Stay safe.
Thank you for explaining about how to obtain the test equipment. I had no idea mpx signal generators can be found on ebay for a reasonable price. Great series, enjoyed it a lot.
SCA stands for Subsidiary Communications Authority. As you said, it is an audio subchannel that lies between 53 and 99 kHz on a multiplex FM signal. It was once very popular for distributing "Muzak" to businesses. It is still used for "Radio Reading Service" programs for the blind that are carried on many non-commercial stations. It is also used with data modulation for the return telemetry for transmitter remote control (a data signal on the link between the studio and transmitter or a dedicated one-way RF transmission is used for the control part of the system). Excellent series of videos!
I've had a SX-1250 since a kid (literally garbage picked, long story). I remember discovering while trying to pick up far away FM stations, if I intentionally let it out of stereo the static would get clearer. Seldom happen though, these things barely even need an antenna to pick up a ton of stations. These stereos have bayfar the best FM receiver I've ever experienced. Everything else sounds like literal garbage to me. I'm a spoiled rotten poor kid, unimpressed by everything else. Thank you for explaining that phenomena.
36:09 Stereo : I think maybe Tony is switching the amp to mono not the tuner ! When you switch the tuner to mono the stereo light goes out and the increase in volume is obvious. Easy mistake on combos, with a camera running and stuff. Great tips great series great apprenticeship if you are learning, Thanks.
Just finishing up Part 5 on your SX-1050; great info! I have a SX-737 with a blown left channel (that i fried in a random Saturday Night haze) that i have been leery on cracking open for over a dozen years now. Your detailed explanations have bolstered my confidence and am considering at least opening her up for a rudimentary inspection. I've known about the issues with caps for a long while now and a few failures/successes with soldering some of my sons cheapo toys just might be enough to get me over the tipping point. This series on your 1050 as well as the 750 have been very illuminating. With few options in my area for repair shops and a lack of confidence in their expertise has always made me feel like i'd rather attempt it myself. ...One day closer, anyways; thanks for the vids.
Thank you! I enjoyed this recap so much especially me owning a SX1050 just now know how lucky I am to own one,I in time just need to find someone I could trust like you that definitely knows what they are doing like you to recap mine, Again thanks Tony👍👍😊
Another great and educational episode. In a next video, would you like to go deeper into measuring the amplifier's output signal, especially the signal generator and its output voltage.
You might want to check out some of my previous videos. Lots of info on the subject. I even did a video on building a dummy load for testing amplifier output power.
Its me again, top effort on this video too. I actually like the way you explain things. Very very helpful, I've always wondered what the Lissajous pattern actually looks like in the real world. .....Thanks again, I'm checking out some of your other videos now...Great stuff!!
In 1976, while in the service, I bought an SX1050 in Europe. ($360.) After 45 years, the AM does not work, the FM sensitivity is poor, the left channel goes in and out, and all the pots are scratchy sounding. I want to refurbish the whole receiver....but it is very pricey. Great videos Tony.
Great this series was great ! I used it to restore an sx5580 (well almost still need to do flat and tone amps) I added some larger heat sinks by attaching so 1.5” x 3.5” alum. To drivers,, and regulator non destructive mod, with just a tapped hole and heatsink grease. Much like your test I’m seeing conservatively 130 wpc before clipping. FYI a pretty good piece of freeware roomeqwizard.com does everything you could want thd, spectrum,sweeps etc..just uses a sound card. Thanks again !
I have a 1050 that is original and the channels drop in and out partially at times. I took sticker of volume control and shot d5 in. Not the way to really get it done but I’m not comfortable taking it apart to clean it and Bal well as I suspect it needs new caps in places. I listen to Bozak concert grands and have 4 sets in diff rooms. Others powered by 1980,1250 which were redone. Would you consider checking out my 1050 which is visually in Ming condition outside and inside with no dust. I did see the tape burned around that start up resister white tape turned black. Not sure where u are located but last one went to Chicago.
I have an old German radio which I was unable to find schematics for, let alone alignment procedures. Hopefully one day I will understand this well enough to not need them!
I would like to know if your 50 hertz capacitor change in the signal path gave you the results you were looking for? I have a sx-1080 I've been looking for a way to gain that bottom end like my marantz receivers.
I just purchased a Sencore 165, it looks like thats all I need to adjust a stereo fm tuner. Why do many people use their HP8657 and then use the sencore 165 signal to plug into the hp to add multiplex?
Hi Sid, great question! The Sencore SG-165 is a very good "all-in-one" signal generator for basic AM/FM/MPX alignment, but it has some limitations. First, the VFO section of the SG165 is not very accurate. It is an analog type oscillator and has an analog frequency dial. I aligned mine with a spectrum analyzer to get it as accurate as possible, but it still is limited by how well you adjust the frequency dial to the pointer. It is good enough for lower-end receivers, but if you are trying to align the higher end equipment (especially receivers with synthesized PLL circuits) it' s not accurate enough. Second, the modulated IF sections of the generator are analog. There is a crystal controlled FM IF 10.7Mhz oscillator, but it's only an unmodulated carrier. This is why you never see me use the RF or IF sections of the SG165. Again, it will work fine on lower end receivers, but not the newer or more high end gear. Last, the MPX section of the SG165 can only generate the MPX signal. If you want to inject the MPX signal into the IF or RF sections of a receiver, you need to use another signal generator with external modulation input. The reason many people use the HP8657 (or similar equipment) is because it is a synthesized VFO and can accept external AM or FM modulation. I also use an external GPSDO 10.7 MHz as an external referance oscillator for the 8657 for even higher accuracy. Hope this helps!
@@xraytonyb Thanks, great info. I am building up my shop. I have an HP frequency counter, Network analyzer and analog HP scope and new Rigol scope. Just curious, if I monitored the freq of the Sencore with these, could I do without the HP signal generator or would it just be too much trouble or just not work as good?
xraytonyb Tony, awesome material... can I use a 10MHz GPSDO instead of 10.7 as a high reference oscillator on the 8687? Why do you use 10.7? Ps what is the name & model of your multimeter please?
I was just wondering if you might be interested in repairing my Elenco SG9500 RF signal generator?, I sure could use some help, I have the manual for this generator and it appears that it actually is a SG-4126 DA or it says that on the inside, however it is a really nice little signal generator with a frequency counter and I sure would like to get it going, it turns on but the frequency counter drifts all over and it appears that there’s no modulation tone output, I bought this as used and appears very clean from the outside in mint condition, however I have not removed the cover from this generator, the previous owner told me what it said on the inside even you know it says SG-9500 on the front, because I was asking him about the manual for this equipment, and he said he didn’t know how that could be but it is what it is. If you think about it let me know if you would, and I hope to hear from you soon, thank you, oh I really like your videos, there awesome, keep up the good work,, take care.
Hi. I'm owner of a Pioneer SX636 that isn´t tunning anything on FM section. Changed the two old fet's 3sk45, two transistors 2sc717 and 2sc461, ic's ha1137, ha1156 and ha1201 all brand new old stock, a few eletrolytic caps , the ceramic ones only in the tunning and mixer stage. Measured the voltages on the decoder and multiplexer ic's, they aren't quite correct, there's one voltage missing on pin 8 from ha1156, change the 2sc945 that is connected in that pin, but nothing. I almost without option now. Would suggest me what could do, what I'm missing.
Tony, I have a question. If I understand you, the L-R, DSB Suppressed Carrier signal has L audio on one side band, and R signal on the other which I assume you know is incorrect. It's the addition/subtraction of the L-R from the original FM signal that creates the L: signal and when both the R and L-R are inverted that generates the R signal. I understand that this would be difficult to make it clear for your intended audience. Your animations which included the math were, of course, correct. Please forgive me if I come across as a jerk, while it may be true, it's not my intention. I love your videos, watch each one, and hope you continue to generate such a valuable resource. In other words, sorry Dude.
I agree. My explanation wasn't so good on that. I'll try to clarify it on the next video (I am working on another tuner). Feedback like yours helps me do a better job on these videos. No hard feelings!
Outstanding. Thank you Tony for all you do here on you tube. I'm that guy your always taking about that is just getting into
this hobby and I have began setting up my bench and gathering equip and inventory. Between yourself, Mark at Blueglow, Paul at Mr. Carlson's lab, Dave at EEVblog, and others Uncle Doug, etc . Not only am I learning, but am also enjoying learning about something I have always feared. After a back injury I found myself getting out of auto restoration and trying to find something to replace it with as I draw closer to retirement, I think I have found it. Thanks again a viewer and friend in Colorado FB..
Thank you for the kind words! I wish you all the best with your new hobby!
Hi Tony. I’ve received one of these receivers for restoration/repair and your video series has been an absolutely incredible help. The one I have is probably the only one on the island of Madeira, and one of only a handful in the whole of portugal, so i’m really honoured to have it to work on and present on my channel, but your help has been invaluable. I plan to mention your channel and this series on my videos on this project, and just wanted to ask if you’re ok with that.
Once again, thank you for this series, and all the other amazing ones you’ve presented and I’ve seen.
All the best, and regards from Madeira.
Stay safe.
I couldn't get enough pioneer repairs !!! Thank you !!!
Thank you for explaining about how to obtain the test equipment. I had no idea mpx signal generators can be found on ebay for a reasonable price. Great series, enjoyed it a lot.
SCA stands for Subsidiary Communications Authority. As you said, it is an audio subchannel that lies between 53 and 99 kHz on a multiplex FM signal. It was once very popular for distributing "Muzak" to businesses. It is still used for "Radio Reading Service" programs for the blind that are carried on many non-commercial stations. It is also used with data modulation for the return telemetry for transmitter remote control (a data signal on the link between the studio and transmitter or a dedicated one-way RF transmission is used for the control part of the system). Excellent series of videos!
Thanks , I really enjoyed the explanation of the various testers and test methods
I've had a SX-1250 since a kid (literally garbage picked, long story). I remember discovering while trying to pick up far away FM stations, if I intentionally let it out of stereo the static would get clearer. Seldom happen though, these things barely even need an antenna to pick up a ton of stations. These stereos have bayfar the best FM receiver I've ever experienced. Everything else sounds like literal garbage to me. I'm a spoiled rotten poor kid, unimpressed by everything else. Thank you for explaining that phenomena.
36:09 Stereo : I think maybe Tony is switching the amp to mono not the tuner ! When you switch the tuner
to mono the stereo light goes out and the increase in volume is obvious.
Easy mistake on combos, with a camera running and stuff. Great tips great series
great apprenticeship if you are learning, Thanks.
Just finishing up Part 5 on your SX-1050; great info! I have a SX-737 with a blown left channel (that i fried in a random Saturday Night haze) that i have been leery on cracking open for over a dozen years now. Your detailed explanations have bolstered my confidence and am considering at least opening her up for a rudimentary inspection. I've known about the issues with caps for a long while now and a few failures/successes with soldering some of my sons cheapo toys just might be enough to get me over the tipping point. This series on your 1050 as well as the 750 have been very illuminating. With few options in my area for repair shops and a lack of confidence in their expertise has always made me feel like i'd rather attempt it myself. ...One day closer, anyways; thanks for the vids.
Thank you! I enjoyed this recap so much especially me owning a SX1050 just now know how lucky I am to own one,I in time just need to find someone I could trust like you that definitely knows what they are doing like you to recap mine, Again thanks Tony👍👍😊
Another great and educational episode. In a next video, would you like to go deeper into measuring the amplifier's output signal, especially the signal generator and its output voltage.
You might want to check out some of my previous videos. Lots of info on the subject. I even did a video on building a dummy load for testing amplifier output power.
Thank you very much to share your amazing knowledge. It helps me a lot to repair receivers and old radios.
Its me again, top effort on this video too. I actually like the way you explain things. Very very helpful, I've always wondered what the Lissajous pattern actually looks like in the real world. .....Thanks again, I'm checking out some of your other videos now...Great stuff!!
In 1976, while in the service, I bought an SX1050 in Europe. ($360.) After 45 years, the AM does not work, the FM sensitivity is poor, the left channel goes in and out, and all the pots are scratchy sounding. I want to refurbish the whole receiver....but it is very pricey. Great videos Tony.
Great series tony, thank you.
So when are you going to open up a trade school? We sure need one. You did a fantastic job here and I actually understood some of it. (Lol)
I don't know where you are located but I could sure use your help from time to time for my classic stereo system!!!!!!
Great this series was great ! I used it to restore an sx5580 (well almost still need to do flat and tone amps)
I added some larger heat sinks by attaching so 1.5” x 3.5” alum. To drivers,, and regulator non destructive mod, with just a tapped hole and heatsink grease.
Much like your test I’m seeing conservatively 130 wpc before clipping.
FYI a pretty good piece of freeware roomeqwizard.com does everything you could want thd, spectrum,sweeps etc..just uses a sound card.
Thanks again !
another top notch video. thank you.
I have a 1050 that is original and the channels drop in and out partially at times. I took sticker of volume control and shot d5 in. Not the way to really get it done but I’m not comfortable taking it apart to clean it and Bal well as I suspect it needs new caps in places. I listen to Bozak concert grands and have 4 sets in diff rooms. Others powered by 1980,1250 which were redone. Would you consider checking out my 1050 which is visually in Ming condition outside and inside with no dust. I did see the tape burned around that start up resister white tape turned black. Not sure where u are located but last one went to Chicago.
I have an old German radio which I was unable to find schematics for, let alone alignment procedures. Hopefully one day I will understand this well enough to not need them!
I really wonder, if the Lissajous pattern is only used to tune the pilot oscillator to exact 19kHz, why not just use a good frequency counter?
Could I emulate that alignment exercise using a Heath 4221 oscilliscope?
I would like to know if your 50 hertz capacitor change in the signal path gave you the results you were looking for?
I have a sx-1080 I've been looking for a way to gain that bottom end like my marantz receivers.
John Marzar is that for sale
I just purchased a Sencore 165, it looks like thats all I need to adjust a stereo fm tuner. Why do many people use their HP8657 and then use the sencore 165 signal to plug into the hp to add multiplex?
Hi Sid, great question! The Sencore SG-165 is a very good "all-in-one" signal generator for basic AM/FM/MPX alignment, but it has some limitations. First, the VFO section of the SG165 is not very accurate. It is an analog type oscillator and has an analog frequency dial. I aligned mine with a spectrum analyzer to get it as accurate as possible, but it still is limited by how well you adjust the frequency dial to the pointer. It is good enough for lower-end receivers, but if you are trying to align the higher end equipment (especially receivers with synthesized PLL circuits) it' s not accurate enough. Second, the modulated IF sections of the generator are analog. There is a crystal controlled FM IF 10.7Mhz oscillator, but it's only an unmodulated carrier. This is why you never see me use the RF or IF sections of the SG165. Again, it will work fine on lower end receivers, but not the newer or more high end gear. Last, the MPX section of the SG165 can only generate the MPX signal. If you want to inject the MPX signal into the IF or RF sections of a receiver, you need to use another signal generator with external modulation input. The reason many people use the HP8657 (or similar equipment) is because it is a synthesized VFO and can accept external AM or FM modulation. I also use an external GPSDO 10.7 MHz as an external referance oscillator for the 8657 for even higher accuracy. Hope this helps!
@@xraytonyb
Thanks, great info. I am building up my shop. I have an HP frequency counter, Network analyzer and analog HP scope and new Rigol scope. Just curious, if I monitored the freq of the Sencore with these, could I do without the HP signal generator or would it just be too much trouble or just not work as good?
xraytonyb Tony, awesome material... can I use a 10MHz GPSDO instead of 10.7 as a high reference oscillator on the 8687? Why do you use 10.7?
Ps what is the name & model of your multimeter please?
I was just wondering if you might be interested in repairing my Elenco SG9500 RF signal generator?, I sure could use some help, I have the manual for this generator and it appears that it actually is a SG-4126 DA or it says that on the inside, however it is a really nice little signal generator with a frequency counter and I sure would like to get it going, it turns on but the frequency counter drifts all over and it appears that there’s no modulation tone output, I bought this as used and appears very clean from the outside in mint condition, however I have not removed the cover from this generator, the previous owner told me what it said on the inside even you know it says SG-9500 on the front, because I was asking him about the manual for this equipment, and he said he didn’t know how that could be but it is what it is. If you think about it let me know if you would, and I hope to hear from you soon, thank you, oh I really like your videos, there awesome, keep up the good work,, take care.
Hi. I'm owner of a Pioneer SX636 that isn´t tunning anything on FM section. Changed the two old fet's 3sk45, two transistors 2sc717 and 2sc461, ic's ha1137, ha1156 and ha1201 all brand new old stock, a few eletrolytic caps , the ceramic ones only in the tunning and mixer stage. Measured the voltages on the decoder and multiplexer ic's, they aren't quite correct, there's one voltage missing on pin 8 from ha1156, change the 2sc945 that is connected in that pin, but nothing. I almost without option now. Would suggest me what could do, what I'm missing.
Left dying in the west Phoenix 🌞 sunshine
X-Y mode (electronic etch-a-sketch)
Tony, I have a question. If I understand you, the L-R, DSB Suppressed Carrier signal has L audio on one side band, and R signal on the other which I assume you know is incorrect. It's the addition/subtraction of the L-R from the original FM signal that creates the L: signal and when both the R and L-R are inverted that generates the R signal. I understand that this would be difficult to make it clear for your intended audience. Your animations which included the math were, of course, correct. Please forgive me if I come across as a jerk, while it may be true, it's not my intention. I love your videos, watch each one, and hope you continue to generate such a valuable resource. In other words, sorry Dude.
I agree. My explanation wasn't so good on that. I'll try to clarify it on the next video (I am working on another tuner). Feedback like yours helps me do a better job on these videos. No hard feelings!
You sir, are a gentleman.