To learn about electronics in a different and very effective way, check out my Patreon page. Many of my designs are released there as well. Click this Link: www.patreon.com/MrCarlsonsLab

This guy is the Bob Ross of the electronic world... "Let's put a happy little TRIAC right here."

As an industrial electrician, that spent literally weeks fault finding and eventually repairing a marantz vintage amplifier, as a hobby at home, this was very humbling to watch and follow. Thankyou sir !

A super probe on a super channel.........Beautiful explained and implemented, simply the best tech/designer/teacher on KZfaq .

Wow, I have the same ADC Equalizer that I bought in the mid 80's. still works great. Thanks for the video.

I am completely naive to the world of electronics but you present in such a way that makes it easy to understand.

ADC one of the best sounding EQ ever made !

Wow, freakin' awesome video. My first equalizer was an ADC Sound Shaper Two (with the VU meter) in 1978. Worked great but with three tape decks I eventually wanted a dubbing feature on the EQ. So in 1982 I purchased this model ($213). With bidirectional dubbing, large LED meters, a good subsonic filter (18dB/oct@15hz), THD and IM of 0.02% and great layout of controls I was pleased. My original EQ was given to my brother-in-law and he still uses it today. That's over forty years. My SS2 IC still functions perfectly and is used every time the hifi is on. Not bad for thirty six years old. Some folks just don't understand how useful an equalizer can be. This video is very interesting and a definite keeper. The SS2 IC is an excellent EQ, functional and pleasing to the eye with that "industrial" look. Remember their first EQ?? The ADC 500??? Well worth an hour of my time to view this. Nicely done, sir.

Love your channel! You are an incredible tech. I used to calibrate analog aircraft instruments mostly rate of climbs and altimeters and we used to call it technician proximity syndrome. I haven't commented yet but have been binge watching your channel. I am also a ham. 67 yrs old and been a ham for 35 yrs. You have more knowledge about things than most people have forgotten. You and Nicola Tesla would have been the team to change the world. 73 de KB7ICI.

Amen brother. Don't know how many times someone sent in a radio saying xxx was wrong with it and the instant it got set on my bench it started to work again. Having been a heavy truck mechanic also many years ago I speak from experience when I say they suffer from the same problem to.

We used to sell and service SoundShaper equaliser back i n The early 70' and this one you repaired is so simpler than the first ones they designed! The had the power supply completely shielded from the rest of the circuitry and used at the first models germanium transistors, but I see their basic or original design hasn't changed to much. Keep videos like these coming , they are a pleasure to watch for a retired old engineer like me! :)

Thanks for sharing another electronic tutorial Paul. That was fun to watch.

Respected sir, I have seen lots of audio repairs uploads on KZfaq. BUT your upload is top of all those .In my opinion you well described, relaxed,well speech,through, well repaired videos.

The modest demeanor is incredible. Awesome work!

So cool to watch you diagnose and repair this graphic equalizer ! You are quite the expert and I thank you for sharing your outstanding skills for others to learn from and enjoy on KZfaq.

What an excellent example and tutorial on the most useful devices for quick repairs! Many thanks Paul, for taking the time going along the schematics with us step by step. You're an awesome teacher!

Great job Mr. Carlson. Old school gear lives on. I've had a smaller version ADC EQ forever and it still works.

Very methodical and reassuring how Mr. Carlson approaches troubleshooting!

Paul - You did it again. The equalizer has come back to life! I appreciate the enlarged schematic. Many times they are too small to read. This time it was much better. Thanks

I had the same EQ back in the day. I miss those component systems.

Your channel is a great gift to the restoration and understanding of vintage electronics.

I have what is probably a previous version of that very EQ. It is simply called Sound Shaper Two and it has analog/mech level indicators. Aside from some of the switches needing cleaning, I use it to this day and and after around 40 years, I still like it! Glad to see with very little effort, they can be repaired! Thanks!

Hi Paul, I am very excited to see your first repair video of the New Year. Nice to see you use the SuperProbe and the 224. I love both very much I have a Mod 222 which I think is very useful, yet not as useful as the SuperProbe I built using your brilliant design. Thanks again for all that you do and sharing your bottomless knowledge, along with your ingenious electronic inventions with us! Take care my friend and please never stop sharing your vast and practical knowledge with the electronics repair community. "Why be a rockstar when you can be a god?" applies to Mr. Carlson's Lab. It's funny, you have the youthful appearance of someone in their late 30's or early 40's and yet you posses 125 years worth of electronics knowledge and experience.

Awesome video Mr. Carlson! Really appreciate the time you take to spread your knowledge. Watched the entire video with immense interest. Learn a lot. Looking forward to taking your course very soon. Cheers!

I appreciate you making these videos with a high megapixel camera. That way we can really see what's going on with the circuitry and individual components.

You are truly gifted in electronics. I'm envious. Thank you for all of your videos.

Great job! Once again, making it look all too easy! And once again thinking I need to build that Super Probe. I built a probe(with an actual germanium diode) and it works well, but the idea of a non-contact probe where one can just wave it close to the board and not having to locate and contact an emitter at some absurd angle is blissful. Curve tracer first, though. Op Amps are coming in from Digi-key as we speak. Your Patreon page has been the single best tool on my bench. I have been using your transistor tester, matching, biasing circuit for a while now and it never fails. I just let your videos play while I work and always learn something new, even if I have heard the video a couple of times.

this is amazing. World Radio Repair Championships are needed

Thank you for uploading extremely informative videos that inspire, help, motivate, and bring pleasure to people all over, and in a professional, calmly hypnotic manner. You deserve a lot more subs!

A pleasure to see a master at work.

So many of your fans have old scopes. One of the most common scopes over the decades was the Tektronix 465B. I think this would be a worthy work horse to go over as a general "what to look out for" and common problems specifically pertaining to this aging scope. I built mine from scraps of others that were beyond ECONOMICAL repair. Nothing is irreparable with your keen skill!

Wow, what a treat! There's always something cooking at Mr Carlson's Lab, but today you coincidentally covered the same model of equalizer my dad gave me which has a similar problem! I can't wait to work on it after seeing this video. I like the curve tracer you were using and the Super Probe was pretty cool. Your channel is an inspiration to me, the way you explain things make electronics fun and less daunting to learn. As always, keep posting awesome repair videos :)

Exemplary details, focus, patience, organization… I admire the thoroughness of this video. Thank you! P.S. I usually trace signal path on schematic with color marker to make it easier to follow as I go back and forth between the unit and the schematic.

Love this video Paul just the way you pursue a problem and solve it is just incredible I have to say this but you are so young but you have acquired so much knowledge and the equipment you have is just wonderful It's always a pleasure to watch you solve a problem and in such detail repair it

Love to see these two tools used in ham radio repair, perhaps in circuits other than audio chains. Thanks again for another great video Paul.

Thanks again Paul for another great video and for your Patreon course. I have learned a great deal and have been able to understand how different parts work together.

One of the best channels on KZfaq! Thanks for a great video!

Superbly efficient troubleshooting, very informative narration, and excellent video/audio clarity -- IOW, A+++! Thanks very much.

I'm not an electronics tech by any stretch of the imagination, but you explain things so well that I was able to follow along without any problems whatsoever. Great presentation and quality I might add.

Outstanding video....dozens of tips, techniques, and bits of information in a single video....bravo.

Great video, man I have to build the super probe and curve tracer asap. Thanks Mr Carlson. Love your channel and being a patreon is a must! Best money I spend every month

Mr. Carlson, the audio on your channel is outstanding, damn near the best on you tube.

I would have to agree,you are the man when it comes to the tiny cities of electronics, I like listening to your comical jokes that sometimes not every body get's,cheers to you Mr Carlson's Lab..

At min 24: HP taught that was the "half/split method." I was a technician for 38 years at Raytheon and then an engineer for up to year 50 and it worked for me

Wow - I had that model in 1983. I loved the way the slider LED's looked with the room lights turned off. Fun to see this.

Wait, I have this exact EQ in my basement right now... I’m definitely glad I saw this video, thank you for posting it!

Absolutely amazing stuff as always, Paul! I've been a patron for a while but haven't gotten around to building the Carlson Super Probe. Having watched this, I just HAVE to build it. Obviously, the time it will save me is a multiple of the time it takes to build it. Thanks so much!

I know nothing about electronics, half the stuff you talk about totally confuses me, but it is fascinating watching how you troubleshoot this sort of thing :)

I appreciate you showing us how we can fix ourselves these otherwise difficult equipment we thought could not be fix by us. Thank You very mucho!!!!!!

man im so keen on making a carelson super probe now. and a curve tracer. ive been obsessed with clipping & saturation shapes recently and i cant believe i didnt know what a curve tracer was. its such a straight forward bit of gear too, but it tells you so much. and the super probe is genius. non-coupled signal sniffing. what a ripper idea. thanks mate you do an amazing job.

I had an Apple tech brake tabs off and leave pry bar marks on an Apple IIc computer because he did not know the proper way to open the case. It really got my goat. I love the channel. Keep up the great work. Wish I knew one tenth as much as you about electronics. I learned just enough to get a ham licence. Love the old equipment (boat anchors).

Thanks!! I've learned soo much from watching your videos!! The lil workflow tricks you do are freakin rad!!! nobody gets that in school!

Paul, I really appreciate your discussion on J-fets and how to test them. Back when I was in electronics school they hadn’t been invented yet, so I had only a rudimentary idea of how they worked. Your clear explanation answered many questions I had. I joined Patreon a few months ago after finding your channel and I have rediscovered my love of electronics again.

You are a great instructor and do an excellent job producing your videos, keep up the great work.

I feel as if I've learned more watching your videos than I did during the handful of mandatory EE courses I had to take at uni (I studied SE). Wonderful content.

We can se that you are a great engineer. Congratulations for that wonderful scenario. People like you make the world a better place. Wish I had 1% of your capabilities. Thank you for your videos.

Loved playing with my equalizer when I was young . Usually when tuning it to a song I was playing to make it sound good the song was almost over . Then played the song again at just the right tone . Half the fun was playing with it !

Another wonderful video. Almost root against you solving the problem because that's where it concludes. All of what was presented was fantastic but how much fun and learning it would have been had we made it into the equalizer sections? I don't think anyone could explain it better! Thanks for taking the time to make it I enjoyed every second.

You make, troubleshooting and finding the issue look like Pre-K stuff. I'm so glad I found your channel!!!

Thanks Paul! Nice work! That opening shot never gets boring! I am almost ready to start making boards. If I can't find a scope this month for my curve tracer, I will start on a more simple device that I already have most of the components for. Or I might just start making boards and set them aside until later.

Mr Catlson's , what a great electrónic technicion,with increadable tools...

Absolutely amazing troubleshooting Mr Paul. This is the first I saw testing jfets, how great the curve tracer see inside the device. Wow, I really enjoyed. Best of the best video only in this channel👈👏👏👏👍👍

Thanks Paul. More invaluable coaching and instruction. I also agree with others in that you should bring the SuperProbe to market either in DIY kit form or finished product.

I don't really understand a lot of what he talks about, but I still very much enjoy watching this channel because even if I don't understand most of the things he is doing, I do slowly pick up on things that make sense to me, so I still gain knowledge about how these things work that I didn't have before.

The Super Probe is incredible. Thanks for making this video.

Great video! You make a seemingly insurmountable task look easy!

Very watchable, educational and inspiring vid - as usual. Thanks.

Repairman's syndrome is REAL! My grandfather worked for Dictaphone way back in the day. He had been called to a particular piece of equipment 8 times but had never found a problem when testing it. After the ninth call he did something odd...he taped a picture of himself on the underside of the cover. He retired 14 years later...having NEVER been recalled to work on that piece of equipment in all that time.

Mr Csrlson, great job! I enjoy your verbose explanations. Test equipment is very much useful. Cheers

You can determine R and L channel on the schematics starting from the S.L.M. Jack. Tip is the left channel, so the right channel is the lower one in the schematics.

With these kind of devices repairs are piece of cake i love your videos so clearly explained everything thank you for sharing this video

love that huge mid scoop they have going on on this unit. i have a late 80s 100 band eq/amp thats needing some repairs. each band has leds on the sliders, some have died , and hard to find 12v square type leds, without paying an arm and a leg. it also needs a re-cap which isnt to difficult once you dig into the unit. Thanks for sharing this beast!

In the 80s, I had *Mr. Wizard's World.* Today, I have *Mr Carlson's Lab.* Life is good! 🤗🎙️📻

I don't understand any of this, but dang, I love this channel!

I used to do with cameras what you do with electronics, but had what we called "Japanese Magic" -- if it was going to malfunction, it would do so for me! A very handy talent when you back your work with your word.

You have the coolest test equipment.

Great video, excited to start my classwork on filters after watching this.

Just in time for me! I'm about to dig into a similar unit for a friend, so again a big thumb up Paul 👍

always a pleasure to see a repair video :) Thanks a lot Paul!

Happy New Year to you Paul! I have been watching and enjoying your video's a lot. Keep 'm coming.

Another happy customer. Thanks for the video.

I worked at a job troubleshooting printer PCBs years ago. I miss the Huntron Tracker (dual trace curve tracer). Great tool. Very necessary as the manufacters would not release schematics to our company. Info on a lot of the printers was still confidential.

Wow! Talk about deja vu, I had the exact EQ. Brings back memories! After this EQ I bought a parabolic EQ , much better!

Great instruction, TS technique, and channel. Thoroughly enjoyed watching.

I “totally resonate” with you. This channel is great.👍

Half-split troubleshooting. I love it!

I love the old HiFi equipment. Great channel!! Really enjoying it!!

this reminds me of when i fixed a DVR that refused to stay turned on - only had to open it up and reseat the front panel connector and it workes again perfectly :D

Merci pour cette belle recherche de panne ! Tout çà très bien expliqué ! . Thank you for this beautiful search failure ! All very well explained !

I’m sure this is going to be another great video and I’m looking forward to enjoying it over the next hour. It looks like nice unit, and these things could be useful in the right hands. Unfortunately, back in the day equalizers seemed to attract those that wanted overly-booming bass and overly-sizzling highs and not those that wanted to subtly correct for a room aberration or poor recording. I wish they had been designed with only +/- 4 dB of gain and not the typical 12. That’s more than enough, really, and would have kept people from destroying the careful sound that engineers take time to mix, while also saving amps, speakers and ears from damage. I can’t tell you how many times I got in a car back in the 80s and 90s, and was tempted to zero-out a friend’s equalizer. Nowadays, I’m still tempted, but the equalizer is buried in ten layers of GUI!

Amazing work again , NYC salutes you electronic wizard

Outstanding material and presentation!

Another excellent troubleshooting video, perfect for the new technicians out there. There is an "official" name for the technique you used to divide the schematic near the beginning of the process - it's called "the half split method" - dividing the block at the middle and checking for signal. It works really well for very complex systems.

Your proximity probe working well and made light work of that diagnostic :)

A practical approach to audio or video equipment troubleshooting/repair: I think the determination of a (the) faulty channel could be done much quicker by a simple "audio in and out" setup. With a cheap mp3/music player, a powered speaker (I have one on my bench always ready to rumble) and a set of RCA cables this would take literally 20 seconds. No need to disassemble anything. From there the search could go on. Or you could determine a properly working EQ, with the only defect a faulty VU meter. It IS "audio" so it can be prechecked audibly :-). I recommend also to changes the state of all of the switches and sliders while testing (aka listening to the test sound/music), so a "rotten" switch or bad contact can be traced immediately. And what I missed in your video was a final check of audio. Only after that step, I would do a thumbs up, not before :-)

Wow…Thanks for this! I love these old equalizers. :)

To say Bravo, great job, is redundant. You know, I know you are brilliant! It's the be brave to open the cover and troubleshoot the problem and don't give up creed! If you follow the signal, you will find where it starts and where it stops you will find the faulty component. Happy 2019, a great video to start the new year. Thanxz

Fantastic. Always learn something new I can apply watching your mastery.

Another great video as usual. Thanks for all your work providing this information.

Mr. carlson's.. the easy way to take us to the trouble shooting with less efforts is amazing..!