Oscilloscope Restoration

[@MrCarlsonsLab]

Interested in learning more about electronics, and viewing more of my video's? Check out my Patreon site, and join the crowd. Click here: www.patreon.com/MrCarlsonsLab

[@tankloverrc1344]

Mr Carlson's Lab i’m not really into restoring vintage stuff but I like restoring retro things like 8-track/cassette players” Also I am going to tell you that when fixing a retro camera...BE CAREFUL and where gloves because you do not want to touch the flash capacitors leads if you do happen to touch them which has happened to me a couple times trust me it hurts like hell because those capacitors can store up to 300 volts.

[@Coalrollinfurry]

Mr Carlson's lab: interested? Your walk thru of your lab, damn near made me hard. Sorry for being brutally honest.

[@Chrissy4605]

I was struck by something you said, Mr. Carlson, 'Today's engineers would be much better engineers if they knew about yesterday's technology'...

[@tommyn.j3628]

You Will never get a Better oscilloskop en this you restore

[@ajimenez00]

Can the 0.1uf 1600v wax capacitors be replaced with a polypropylene cap like an orange drop?

[@robertplays9062]

I am now in my 70s watching this project brought back some long forgotton memories. at the age of forteen i had just started work having been interested in radio comunications since the age of 8 i came across an article in practical electronics offering a new way to learn electronics and new trouble shooting tecniques by building your own occilscope the course ran for 12 and all it would cost me £2.17'6d per month so i sighned up and it was one of the best moves i ever made I learnt a lot from that course and ended it with my very own occliscope and mutimeter both built during course. De Bob G7DME UK

[@georgegherghinescu]

Hi. Regarding the flat head screwdriver slipping and marking a nice face. From experience (watchmaker) I have found that it often happens because the tip of the screwdriver blade is too thin. The blade tip rests against the bottom of the screw slot and it is basically similar to resting on any flat surface. To avoid slipping, the screwdriver blade should be thick enough so the contact points with the screw head are along the edges of the slot. It should not touch the bottom of the slot. That way when you press on the screw, the blade jams in the edges and it stays fixed. Also it leaves the screw head in better condition than a thin blade. In watchmaking we use many screwdrivers with different blade profiles. Sorry for the length of the comment :-) Merry Christmas!

[@maxs.3238]

When working with screws that have very big slots or are worn out a bit a small piece of electrical tape over the blade of the screwdriver helps a ton sometimes. 4 years later but maybe this saves someone's paint😅

[@Magisktification]

@@maxs.3238 Good tip actually!

[@trainliker100]

Most regular screwdrivers aren't really ground properly. The tips are wedge shaped. Screwdrivers used by gunsmiths are MUCH better as they have good concave grinds to help keep the part of the screwdriver in the slot vertical to the edges of the slot. This helps prevent slipping. And, of course, slipping screwdrivers is very undesirable in gunsmithing. A couple of brands are Brownells and Wheeler, but there are others.

[@mikekrieger8171]

Very nice video. I worked at Heath Co. from 1963 through the last day before closing. Worked as a service technician and worked on many O-11 scopes. Also worked on most other products in the Heath line. Nice to see this test epuipment get such TLC

[@BruceNitroxpro]

Mike Krieger , What are the designations of the FIRST (oldest) Heath oscilloscopes? Please leave the list here as a "reply." Thank you so much! [e-mail]

[@kevinalm6686]

This video just saved me a lot of time and trouble. Got a Heathkit IO-4205 dual trace 5 MHz scope real cheap and started to restore. I got to the point of calibration and adjustment. I got to the triggering adjustments and realized something was very wrong. About half the trigger mode setting combinations didn't work! I was about to go hunting through the trigger circuits when I remembered what you said about the builders being in a hurry and making mistakes on point to point wiring. Ten minutes later checking the wiring to the trigger mode switches and comparing to the schematic and I had the answer. The builder remembered to solder all connections, unfortunately one wire was soldered to the wrong switch. He/she was in a hurry, got confused, and messed up the wiring job. A quick rewiring and I was back in business. Thankyou very much Paul.

[@MrCarlsonsLab]

You're welcome Kevin

[@galacticedge1583]

I know everything takes a lot longer when you have to shoot the video too, but we all appreciate it. I always learn something new. Keep up the good work.

[@MrCarlsonsLab]

+Galactic Edge Thanks!

[@uscaremealotyt]

You seem to be a very kind man and eager to share your knowledge with the world, so thank you because that is rare.

[@lionelguy]

Thank you Mr. Carlson, for the step by step process of restoring these classic electronic instruments !! You are keeping the hobby very much alive and well !!

[@MrCarlsonsLab]

+lionelguy Your welcome!

[@JerryDodge]

Before you even explained why you're making this video, I said to myself, "Yes, I do want to watch this. Using tools to repair tools. And not just any tools. Very sophisticated ones.

[@donmoore7785]

My dad used an 0-11 at home for many years. He was a Bell Labs man. I sold it on Ebay a year ago, to someone who was planning to restore it. Maybe he had seen this excellent video. I bought a digital scope to do work on digital clocks and electronics... and I am not sorry I sold the 0-11 - but this does bring back memories.

[@zbyszekpodchmielony2642]

This is another movie that I watched with real pleasure, Mr Carlson !, and I am still learning despite my retired age and almost 60 years of my own experience in this field :-) Thank you! and Best Regards Vy73!

[@roberthorwat6747]

Being the clueless bodger that I am I was expecting my brain to melt early in on this job, your skill in preventing that from happening is amazing! I loved the neatness of the work, the cable management, the complete absence of hot snot, the aesthetics in retaining the original cans and the overall level of care and attention made this a pleasure to watch. Great job!

[@MrCarlsonsLab]

Thanks Robert!

[@Twin_Flyer]

Wish I had found this channel earlier, love older test equipment and bringing them back to life and usable again!

[@glenmartin2437]

Thank you. I was able to build a number of laboratory instruments as a PhD research scientist. I enjoyed your video.

[@JennyEverywhere]

Wonderful! Excellent job, and fascinating work! I had an old Eico at one time, my first o-scope, that I picked up at a garage sale for around $5.00. It worked pretty well, though at 13 I had little idea how to use it properly and no one to teach me. I managed to make it do all sorts of stuff before a lack of knowledge...and a lack of anything to use it on...got it relegated to my closet. I'd also picked up what had to be someone's educational kit, a very small, open-chassis o-scope with a very small CRT, no more than 2" in diameter. The CRT mount was at an angle, the front faceplate of the unit bent at an obtuse angle back towards the rear of the scope near the top to accommodate it. I managed to get that one working as well, but it made me nervous as it had NO chassis cover on the back portion, and high voltage was not my idea of a good time. I'd tried when still younger to re-string a vernier in an old shortwave by leaving it on and using the panel lights to see by. I should have found a flashlight or moved a lamp so I could see, in hindsight, as I must have bridged something VERY hot. I got my tush shocked across the room, and my arm tingled and wouldn't work properly for a few minutes afterward. It was a great teacher in any case, and I had a far healthier respect of high voltage after that!

[@TKomoski]

Good on you

[@BruceNitroxpro]

@@TKomoski , try a 2000 vdc suppy for my kilowatt linear (GG 213s) hooked to Giesler tubes, which leaked electrically through the cracked basement floor. Yikes. Mom didn't LIKE seeing my eyes rolled up at all. I'm 78 years old now and remember it SHOCKINGLY vividly. de KQ2E

[@minkorrh]

You should be a professor/teacher/instructor. Very well explained and detailed. I wish I had half the knowledge!

[@3v249]

I have an older Sony 308 analyzer I've been playing around with. I'm hooked again once more. Thank you sir

[@andrewchurchley5705]

Love old Heathkit gear, love to see it restored and enjoying the feeling that it now has built-in reliability.

[@michaelchambers7691]

I really started to appreciate these vintage vacuum tube test equipment in my 40's. People have gave me vacuum tube equipment when I was a teenager, I was an idiot for not hanging on to those previous equipment and I didn't know how to use them either. Now, I have 5 vacuum tube test equipment that I successfully restored.

[@Willam_J]

I supported my ham radio hobby, while I was in college, by going to hamfests and buying, restoring, repairing and re-selling Heathkit equipment. Most of the time, it was just a matter of repairing solder joints, placing transistors into the correct orientation and other building mistakes. I could buy the equipment very cheap, sell it for a fair price and still make a good amount of money.

[@warplanner8852]

Paul, good job. A tip for those who do this restoration: level the CRT trace by marking a line on the horizontal trace with a ruler and a felt marker then power the unit off, discharge the caps, etc. Then twist the CRT until the line is perfectly horizontal. Tighten up the clamp and wipe the marker line off with alcohol.

[@MrCarlsonsLab]

+William Phinizy Great tip William!

[@tonit9978]

Wow! So many professional electronics around you! Congratulations!

[@michaelchambers7691]

I restored a Heathkit Model IO-18. I cleaned the case and spray lined it with flat black Rustolium. I placed brand new capacitors in my oscilloscope, replaced the light bulb with a super bright LED and 1K resistor. Cleaned and lubed the switches with CRC QD contact cleaner. Careful to not remove the paint from the tubes. My Heathkit IO-18 works perfectly. I recommend to obtain the assembly instructions, go about restoring the oscilloscope as like building the kit. That's the best way to learn.

[@toddanonymous5295]

Mr Carlson, The can cap mod solved something I have pondered for some time. Excellent advice. I started a binder labeled Carlson's hints to keep track all of the good examples your videos provide. Thanks again for sharing your skills with us.

[@MrCarlsonsLab]

+Todd Anonymous Glad your finding the series useful Todd!

[@waynethompson8416]

+Todd Anonymous That is an excellent idea...a binder of hints and how to's! Thanks for sharing!

[@DeeegerD]

Love the attention to detail - great job! Thanks!

[@richardnday]

That was great. I own one of these model Heathkit Oscilloscopes. I will follow your video as I go through the restoration of mine. You are so thorough in your explanations, I am confident I can accomplish the task. Thanks again.

[@MrCarlsonsLab]

You're Welcome Richard!

[@jggmobile]

Great video Paul. I just ran across a Heathkit OM-3 that I'll be restoring soon. Thanks for the preview.

[@thomascowan1825]

Really enjoyed your presentation on this Heathkit oscilloscope. You explain it very well. Thank you Mr. Carlson.

[@travisalan]

Used to watch these vids while bored in my math/reading help class in freshman year. Just graduated and came back to watch some more. Crazy.

[@BruceNitroxpro]

Travis Alan , Unbelievable... but crazy GOOD, I'd dare say. Math is the basis for almost all electronics. The higher the math level, the higher the understanding of the theory. Stick with it! After about 75 years, you'll see what I mean.

[@MrNonDescript01]

"Let's see how it does at 2MHz.. now at 3MHz..." "...at 3GHz." Awesome video - reminds me of my old EICO I had many moons ago. That thing was a tank of a scope!

[@ronb6182]

Sometimes resistor values change to compensate for higher input voltages. When working on tube circuits you must not let the voltage exceed the rating of the tubes. Remember line voltages were lower when tubes were used in electronics. Most line voltages were 110 to 115 volts AC. Now voltages are 125 to 128 Volts AC. I always use a voltage reducer when I plug in my tube electronics. I saved even my string of lights by using a voltage reducer. Thanks for this Video I am glad tube electronics is still alive to this day.

[@johncunningham5435]

Very well done; it is nice to see these old scopes come back to life and still be usable in majority of repairs where most people would landfill them. Like you I prefer the analog type and still use one to this day in my shop, thank you Paul for the follow up restoration in demonstrating the revival of the Heathkit O-11 Oscilloscope.

[@MrCarlsonsLab]

+John Cunningham Your welcome John!

[@charlesbickenheuser8281]

Impressive, You attention to details is what makes the difference. I always learn something new from You. Thank You.

[@MrCarlsonsLab]

+Charles Bickenheuser Your welcome Charles!

[@TonyButchT]

I bet it's the best that scope ever ran! Thank you for the lesson/video!

[@MrCarlsonsLab]

+Tony T. Your welcome Tony!

[@jrdubois112277]

I bought this exact scope on ebay a while back, because of the cool, old timey round screen, with the aim of fixing it up to use in a "Frankenstein's Lab" Halloween display. I plan on building a little circuit which produces a heartbeat trace and a new enclosure with large vacuum tubes glowing at the top. Of course, the other 364 days of the year I get to use it as a normal scope. Another great video, sir!

[@MrCarlsonsLab]

+jrdubois112277 Thanks!

[@JerryDodge]

Can you imagine, some old retired technician, watching these videos, and suddenly realizing "Well, I'll be damned! That's the exact same damn device that drove me nuts back in 1984!"

[@jjhack3r]

You are always extremely informative. it's good to know that there are still people who can teach me things.

[@raymondheath7668]

I have a few kit scopes on the shelf 30-40 years old. My current project is restoring a Bell & Howell 100-4540. I think it's only 1-2 mhz, but it will be good as a starter for my grandson. Always enjoy the detail explanations you give, very helpful

[@carldavis2881]

I was correct. You always suprise with new knowledge nuggets. Kudos to one of your best yet. You prove beyond a doubt that presetation of your work is just as important as quality, but I especially enjoyed the reasoning behind your repair decisions and methods. Keep up these great presentations.

[@MrCarlsonsLab]

+carl davis Thanks Carl!

[@TheRadioShop]

Very nice restoration Paul. Excellent job! I liked the way you mounted those capacitors, very clever. Much easier than restuffing them. This was a very nice video to wake up too. Thanks for sharing.

[@MrCarlsonsLab]

+The Radio Shop Thanks Buddy! It's been a long couple of days.

[@TheRadioShop]

+Mr Carlson's Lab I bet, love seeing all the tools, solder, parts laying in a pile on a bench. That tells me a lot of work was going on and shows the effort that is being put into the repair. Good job as always Paul.

[@MrCarlsonsLab]

Thanks again Buddy! I see you have a new video up as well..... I'm off to watch it now :^)

[@TheRadioShop]

+Mr Carlson's Lab Great!.. Uploading 2 more at the moment. So much to do so little time. You are mentioned in one also :-)

[@yannkitson116]

Thank you for taking time to make this video. You can resoften old hard rubber if you leave it in break fluid for a day or so until it get soft. It will never be as new, but it will be close.

[@MrCarlsonsLab]

+Yann Kitson Thanks for the tip Yann!

[@rleeAZ]

Nice demonstration of making an old workhorse earn it's keep. I learn something new every time I watch one of your videos. thanks and look forward to more!

[@MrCarlsonsLab]

+Richie Allen Thanks Richie!

[@kenzingzong6704]

My Eico 460 can't even push 2 MHz half the time w/o issue. Guess it's time to go through the guts and see what needs replacement. This was an incredibly informative video and even as much as I thought I knew about electronics and scopes this gave me a few "huh" moments. Thanks a ton!

[@corneleousworthington4566]

Thanks for showing this!!! Really cool to see what these old units can do!

[@MrCarlsonsLab]

Your welcome!

[@infinitecanadian]

I think my dad has one of those! He inherited it from Grandpa, and I remember playing with it in his shop.

[@BillyLapTop]

Great job! It is great to see your respect for vintage gear and to keep it relative to today's needs. Watching your restoration made me feel like it was 1961 again when I built my first Heathkit. As for electric shocks, I got zapped plenty of times playing around with old TV sets picked up off the curbs in my home town on junk day and building bootleg CW transmitters out of those parts. Gee, a thirteen year old had to have some kind of hobby back then, Hi Hi!

[@MrCarlsonsLab]

+BillyLapTop Thanks Billy! Don't zap yourself too much! :^)

[@Rod_Knee]

Excellent. This kind of repair/ rebuild is just what I like. Please keep up the good work!

[@vihuelamig]

I had a 70's/80's Hitachi dual scope but that Heathkit is a much more attractive looking scope. I love it! Wish we got more of them this side of the pond.

[@davidlegault9745]

Nicely done Mr. C - you are a class act.

[@MrCarlsonsLab]

+David Legault Thanks David!

[@billmoran3812]

Learning restoration on older test equipment would be good knowledge. The cost of old equipment is low enough for most of us to acquire. For the cost of a few parts it's well worth it.

[@michaelchambers7691]

I really love these Heathkit vacuum tube test equipments. Discharge the caps and use the assembly instructions. The nicest thing about obtaining the assembly instructions is to understand the equipment.

[@UOttawaScotty]

Oh my god, I have the EXACT same oscilloscope at home and I was just about to tear it apart the other day to use the parts, I'm so glad I didn't. I'm going to see if I can get her going now. Everybody that I talked to said it was useless, but I had a feeling I would use it for something, I'm old school so I like the older stuff. Thanks so much for the video !

[@MrCarlsonsLab]

+UOttawaScotty Your welcome. Glad you are keeping it!

[@RadioUXO]

I just logged in to request this after watching the preceding video, and here it is! Thanks!

[@geoffmulberry]

More awesome stuff Mr. Carlson! I'm still looking forward to the Panadaptor restoration. Keep up the good work! 73

[@ianbutler1983]

I would watch a video of Paul making a ham sandwich...and enjoy it.

[@vintagesound5847]

"HAM"

[@Redh0und]

@Po Lu who doesn't?

[@estpst]

with cheese

[@BruceNitroxpro]

@Po Lu , Duh... because he IS a ham! (amateur radio operator)

[@BruceNitroxpro]

@@estpst , A cheesy reply, for sure... LOL

[@michaelchambers7691]

I really enjoy how small modern capacitors are. I replaced those 2 high voltage .1uF 1600V capacitors with film capacitors on my Heathkit IO-18.

[@tedvanmatje]

After all this time, it still facinates me how clean and precise your work is, Mr C. As they used to say in the Army "...lead by example", which you most definitely do well. Looking at the insides of this Heathkit, it surprises me how low the component count is, I thought there would be more (expectations ruined by modern technology, lol). thanks for posting this and for 'mentoring' me for the last year and a bit - cannot wait to see what 2017 brings ;)

[@mikehauk6079]

@ Mr Carlson's Lab.... Beautiful . I've the same make and model. It literally fell off a truck. I did some work and it lives. Has actually been my #1 mamajama for quite sometime. After seeing your video, I will be doing a complete overhaul of it in the following week.

[@MrCarlsonsLab]

Great!

[@ezl7052]

LOLs, I caught that unsoldered wire connection before it was mentioned by you. I've put a lot of HeathKit equipment together and have bought a lot of it off of Hamfest and that's one thing I look for and many times chassis screws aren't tightened down ect. I bought a HeathKit SB-221 linear amplifier from a dealer and I ended up going over almost every screw on the chassis because they weren't tightened down. I can imagine the RF floating around when it was keyed up at full drive! The old PC boards on the older equipment weren't as good as the glass-epoxy boards of later date, either. The old boards were terrible around components that ran hot on tube equipment since the foil would lift from the heat after time. Your restoration on this project was outstanding and thanks for the video.

[@MrCarlsonsLab]

+Dennis Petersen Thanks for the kind words Dennis! The boards in this scope were marked "Formica" and they are very sensitive, as you mentioned.

[@shanookflc]

Excellent job Paul couldn't have done better my self. A top class restoration loved it.

[@MrCarlsonsLab]

+Paul Craddock Thanks Paul!

[@TRXLab]

I love it, very well done Paul! Like how you fixed the caps. Great old stuff glad that you have done this restoration and the excellent demonstration. See you 73

[@MrCarlsonsLab]

+TRXBench Thanks Peter! 73!

[@jerrykovacs3782]

Great series and so well done. I appreciate the detailed explanations and especially the side hints on what to watch out for concerning components (old rounded molded resistor trouble, shielded end of caps for example). I have been restoring receivers for years but with your videos I am learning a lot. I really liked your approach replacing gang can caps using the existing tie posts and the ceramic stand-offs. Thank you so much. Looking forward to more!

[@MrCarlsonsLab]

+jerry Kovacs Glad your enjoying Jerry! Thanks for the kind words.

[@Me11oIngenuity]

Fantastic job! Loved every minute of it.

[@MrCarlsonsLab]

+YankeeIngenuity Thanks!

[@MrJohn1966elliott]

Awesome !!! Old Oscilloscope is brand new. It will be another 50 years life.

[@MrCarlsonsLab]

+John Elliott I hope so :^) Thanks John!

[@buskman3286]

Great Video, as usual. I restored a Heathkit 09 (1950) last week based on this video and the original manual that came with it. Works great! Only issue is the focus can't get to a sharp line in both axis. I can get a sharp vertical line OR a sharp horizontal line but not both at the same time. Obviously some issue with focus circuitry that I haven't figured out. But I'll keep trying! Great Job Mr C!

[@buskman3286]

Turns out it was an open resistor on the focus circuit. :)

[@djfrank59]

Good restoration on this scope. I'm actually impressed that the signal was view-able past 5 mHz! I still use my old Eico 460. I have a few 2200 and 2400 series Tek scopes, but still favor the old Eico for most of my work. Keep 'em coming! :)

[@MrCarlsonsLab]

+Frank Ferraro Thanks Frank!

[@N1RKW]

Great video! Thanks for taking us along for the ride. I now have a much clearer idea of how to re-cap and troubleshoot my functional but finicky HP 120B scope. Thanks!

[@MrCarlsonsLab]

+N1RKW Your welcome Adam!

[@cptspinach]

Great video! I'm in the works of restoring and replacing all the old caps on my O-9 Heathkit from 1953.

[@MrCarlsonsLab]

Great! let us know how the resto goes.

[@supertravdoggy]

I love your channel. I appreciate your no nonsense approach to troubleshooting and the way you never half-ass your work. I am a second year electronics student and i was wondering if you have thought about doing a video on UHF/Microwave communication equipment or high frequency theory and special problems associated with tiny wavelengths. Also TV broadcast and test equipment could make a good episode. really anything you do is great,thank you and keep them coming.

[@MrCarlsonsLab]

Thanks for your input Travis!

[@fnordhorn]

Still got my Tektronix Type 422 Portable Oscilloscope from 1985 when i was a field Eng. for DEC ' Still works good could use a good calibration - last one 1982

[@BruceNitroxpro]

Fred Nordhorn, AND a recapping, for sure!

[@VintageProjectDE]

Really nice video, again. Thank you for sharing not only the video, but also quite a bit of your knowledge and experience. I found your videos an invaluable resource to come back to while troubleshooting vintage gear.

[@MrCarlsonsLab]

+Thilo Niewoehner Thanks Thilo! Glad you enjoyed.

[@materialsguy2002]

Great video, Paul. I picked up a few more tips and tricks from watching you work. Thanks!

[@MrCarlsonsLab]

+Shaun Merrigan Always a pleasure Shaun!

[@mikesradiorepair]

Nice restoration. Will make a nice addition to the bench. Like your way of gluing the capacitors together for a neat installation. If you ever want direct replacements and are not afraid to pay for them you can get custom can caps made by Hayseed Hamfest. I have purchased custom can caps from them several times and was happy with their products. Mike

[@MrCarlsonsLab]

+MikesRadioRepair Thanks Mike!

[@EdWatts]

Lately, with the advances made in capacitor technology, I find that gutting and restuffing the aluminum cans with modern devices is much more aesthetically pleasing.

[@djhaloeight]

Fascinating stuff! Love your videos...you have a great teaching/explaining style.

[@TheFieryWrath]

I always see videos with high voltage capacitors mentioning the importance of discharging them beforehand, but not many where people actually go about making a board safe to work on. Would you be willing to do a video on capacitor safety, and any tools/equipment that can be used to help? If it's in the Patreon course already a link in the descriptions would be great.

[@arty2981]

You sir, have got some incredible talent and knowledge! Thank you for sharing it with us and please don't stop!

[@towerman75]

Great video. I too tried to restore an HO-11 scope, but not as lucky. It works, but the trace is hard to control, and doesn't resemble the signal going into it. So I just shelved it.

[@Wenlocktvdx]

Interesting how this Heathkit scope front panel closely resembles the British Cossor scope I had in the 80s. I did replace a couple of weak tubes but it needed recapping and I sold it at a garage sale. Tandy/Radio Shack still had tube testers in their stores and I was able to buy any tubes I needed from the store. I made sure I read the instructions before I tested any tube and checked that I had the right settings for the tube so I didn't get any bad results. The Cossor had more tubes and was dual trace, there was also a voltage reference tube.

[@theonewease]

Thanks Paul! Really looking forward to the rest of this series!

[@MrCarlsonsLab]

+G Morgan Thanks!

[@1pilotsteve]

Awsome job......I am sure my dad had one of these scopes.... I love how all the old Heathkit stuff had huge pilot lights letting you know they were "on" and ready to use...

[@MichaelLloyd]

Nice restoration Paul. I really enjoyed the video.

[@MrCarlsonsLab]

+Michael Lloyd Thanks Mike!

[@juanabreu5127]

Extraordinary good job. People like deserves to live for ever. Thanks.

[@claytonkeltto3239]

Thanks - another great video and great information! I'm about to refurbish my Heathkit IO-21 and I'm sure many of the tips for the IO-11 will apply. If you ever have time, I'm still really interested in seeing more about your modified EICO 430/Curve Tracer. Thanks again for all of your efforts to instruct and entertain us...very well done! Take care!

[@waynethompson8416]

+Clayton Keltto I too, am interested in seeing more about his modified EICO 430/Curve Tracer. If they were available, I could easily watch Paul's video's 24X7 because you always learn so much...even on the videos in which I feel I already "knew" most of it, the parts that I didn't are simply amazing! The little details that mean so very much...and can save you so much. Would love to meet him in person some day.

[@jeanderamee488]

This is a keeper as all of your videos, thanks for taking time to explain this electronic stuff. Very well done.

[@MrCarlsonsLab]

+Jean Deramee Thanks Jean!

[@earlrichardet2102]

Thanks Paul, once again, a beautiful restoration job!! Cheers, Earl

[@pmaher3211]

I have an Heathkit om-3, with the help of this video I think I can get working again! I restore tube radios and amps and would very much like to see how you use your 0-11 when trouble shooting. Thanks!

[@saturn5tony]

Awesome restore Paul...wow! Thanks 4 sharing!

[@MrCarlsonsLab]

+saturn5tony Your welcome Tony!

[@rickgoebel6724]

Very good demonstration of your methods of work and the reasoning behind them. I would like to know how you go about discharging the capacitors. Also, the use of protective gloves when handling the CRT is a good thing to do. An imploding cracked tube is dangerous.

[@zaum2002]

I just bought the same scope for 20 bux . Looking forward to the rebuild. Thanks for the video.

[@MrCarlsonsLab]

Glad you saved that scope!

[@stephencorfield7720]

Used to use an oscilloscope to keep a 7 colour photogravure printing machine in register. There was a scanner on each printing head which read a printed bar which came up as a blip on the oscilloscope . Once the machine was set up properly and the oscilloscope recieves blips from each scanner the machine would automatically keep register .

[@MrCarlsonsLab]

Interesting!

[@richardcunningham5764]

Great video Mr Carlson. I've got a KG 635 that needs going through. It was meticulously built many years ago at a vocational school. So I want to bring it back to life. Lost the high voltage to the crt when I briefly looked at it. Going to check it out very carefully before powering it up again. It worked amazingly well for many years. Have some more modern scopes but enjoy the older stuff still. Your lab is a very cool time warp! Thanks

[@mrjohhhnnnyyy5797]

Your videos are pure gold. I'm looking forward to the trick about bandwidth. I have a 10MHz CRO, and it displays 10.7MHz just fine and even higher. The problem is when the frequency is above its bandwidth, the thing may not trigger properly and read the amplitude wrong. This Heathkit also shows the same - higher the frequency, lower the amplitude gets (that, of course, if your RF gen keeps the output voltage constant).

[@MrCarlsonsLab]

+MrJohhhnnnyyy HI. The front end, (vertical section and sync section in general) of the scope is "running out." this is the reason the amplitude drops. In the near future, I will do some video's with this old scope, showing some of the tricks. Thanks for your kind comment John!

[@mikejohnson9257]

Hi Mr Carlson! I really enjoyed this video as someone sold me an old Heathkit 0-12 oscilloscope. I have a limited knowledge of electronics but watch tons of electronics engineering videos from you, Dave from eevblog, shango066, bigclivedotcom, and etc... I was going to resell this scope but I'm so glad I watched your video as now I feel confident in restoring this old scope. thank you for this information. I find all of your videos very fascinating and useful!

[@MrCarlsonsLab]

Thanks Mike! Glad you found this helpful.

[@abeleballestri612]

Very beautiful and didactic description how an old oscilloscope can be renewed as a brand new one up to 8mhz it was really fantastic. Thanks very much for your very useful technical information . Abele Ballestri Switzerland. I liked it very much indeed especially for the didactical information.

[@MrCarlsonsLab]

Your welcome Abele!

[@robertcalkjr.8325]

Nice job, Paul. It was a pleasure to watch. Thanks.

[@MrCarlsonsLab]

+Robert Calk Jr. Your welcome Robert!

[@Darryl603]

Awesome Thanks for sharing. I'm interested to see the different ways to use the oscilloscope to troubleshoot a stereo receiver. In particular, I have a Sansui 661 with a right channel that sounds really flat ( no highs ) Even the bass doesn't sound very good. The right channel sounds normal, so I'm at a loss as to what might be causing the problem. Thanks again, it's a pleasure to watch you work. We are all very fortunate that you are willing to take the time to share your knowledge with us.

[@MrCarlsonsLab]

+Darryl 603 Your welcome Darryl!

[@bekka1591]

Darryl 603

[@halstowers3261]

Mr Carlson is one sharp fellow

[@jmtrepanier3575]

He is a great guy ! I use to build a scope like this as a kit back in 1967. To all of those that put a thumb down ,i put my middle finger up ! 😱😄😄😄

[@electroboy7422]

this oscilloscope will stay for ever 👍

[@johncliff5417]

Hi Paul, I wish that I could have seen this after picking up the Heathkit scope that I got for £5.0. a long while back. I cannot remember getting such a clean trace has you finished up with on that one. Well done restoration. 73 de John - G0WXU.

[@dmwtech4495]

Thanks, that took me down memory lane. My very first scope was indeed a heathkit, though not a tube one, but with a very similar crt tube. dual trace, discrete components. thanks bunches. :)

[@MrCarlsonsLab]

+dmwtech Your welcome!