How to repair Heathkit IO-4510 oscilloscope horizontal sweep problem 

I have a very similar scope - a Heathkit IQ-4550 dual trace scope. Only problem I had with it was power transistors that drive the vertical deflection plates go into thermal runaway. Sympton was a trace that slowly went up and off screen as the scope warmed up. Cure was to heavily heatsink these vertical deflection transistors. Heatsink was homemade. Trace still moved vertically very slightly after 30 minute warmup, but vertical position knob easily brought it back on screen.

It has been a great pleasure to meet you on RU-vid. Very good video. You are an electronic repair professional and you are also a professional presenting the videos. I say this, because I am an electronic technician and my mother tongue is not English, I understand you enough, because you speak clearly. Well what interests me. In 1986, I bought and assembled a Heathkit oscilloscope model IO-4210, to complement my study and add as a tool to the workbench. After two years of operation, the oscilloscope began to fail. This burned some transistors in the high-voltage source. I replaced the transistors and it worked for a while and damaged them again. I inspected and detected a fault with the power transformer, in the high voltage secondary coil. I rewind the high voltage coil and put the equipment back into operation. After almost three years, it failed again of the same. I took the oscilloscope out of service, because it was impossible for me to get a new transformer. I replaced it with the Fluke scopemeter 123, which I have out of service for damage on the display. Because of this, I set about reviving the Heathkit oscilloscope. Any question that I have in the repair of the oscilloscope, I will consult. Thank you.

Good to see you keeping these old gems alive Terry. They deserve another chance.

I love this channel! Very informative and entertaining, too. Thanks, Terry!

Love the old equipment and have some here in the shack. Thanks for your great devotion to the boat anchors that we all want to make new again.

Full of detail! You are an electronic genius. Many other people like to cut out steps so that audience will never have a clue how they fix the issues. I hope you will try to repair Tektronix oscilloscopes next time.

I met some very awesome repair guys one being George Runyan W6YEC but you sir not only repair but make it entertaining which opens and inspires the rest of us to pick up that VOM and those “pending” projects and get moving. Your channel should be required watching for all new HAMS and electronic wannabes..;-)

Excellent repair! Love these videos! Heathkits are always a pleasure to use and restore!

Congratulations mr.Terry, one more repair completed successfully!

I've - just - seen the moisture and the damage done... Great video! Thanks Terry! Laurent

Straight scopin' stuff out! Great job Mr. T!

Another fine production, Terry!

You're a great explainer, and fun to watch!

I took your advice Terry and picked up a Heathkit unit, an IG-72 audio generator. I am in the process of cleaning pots and plan to replace the caps and some out of spec resistors this weekend. I tested the tubes on a Superior tube checker I received from a co-worker (replaced caps on it as well). Followed your advice and installed a power line fuse as well on the tube checker. I have a busy winter ahead!

I just bought a kit of this exact model scope on ebay a couple of months ago - Thanks for the video - should be fun to build it!

Great job chasing that down Terry. You've highlighted the importance of studying a schematic a formulating a plan. Well done my friend

Thanks Terry! I have the same scope I built in the 1970's Still work great. I use it in my ham shack Thanks for a great video! N3SWL.

What a great video as usual.

Thanks for the video, very informative.

Thanks a lot ! Very exciting indeed !

My favorite channel.

worth fixing lots of fun heathkit is great and a good scope still

Hang in there buddy,your doin a great job,always funny and informative.👍✌🎸🍺🔌

I found a Heathkit scope at a garage sale years ago but never did anything with it. I actually forgot I had it until I saw this video. Now I'm going to need to dig it out of the attic and see what model it is. LOL

some cross references for heathkit can be found at "www.radiomanual.info/schemi/Surplus_Radioamateur/Heathkit_components_cross_reference_2003.pdf" ...as always, another good video

I just got the same scope, just because is heathkit, local buy and cheap. Mine is a bit better but so far the same transistors are bad. I already watched all the videos. Many other ones, as well.. Thanks

That was awesome Terry, I'd like to find a school of sorts in the NYC area where I can learn the fundamental basics of this electronic work. I'm a Operating Engineer in HVAC over 32 yrs now and most of our work usually winds up being electrical/electronic issues. I've gotten good with it too. Going through the apprenticeship school for a few years really helped, I've built tube guitar amps, tube stereo amps and effects pedals over the years as well. Its the understanding how to use a scope, function generator etc type of stuff I want to nail down

Why..............Thank You Doctor!!! hahaha Great as always man! Shalom from Lakeside MONTANA USA!

Good morning Terry. Long time subscriber and a big fan of D-Lab. What’s your take on older Tektroniks scopes? I picked up five large tube units this past weekend and could use a little insight into troubleshooting/refurbishing at least one working scope out of the five. I’m sorry that I don’t have more identifying info on them as I’m at work (on break of course). They’re all modular with 3 removable sections or maybe 4? Anywho, just wondering if you would ever do a vid on older/vintage Tektroniks O-scopes? Have a great weekend and happy Friday, wahoo, have a glass of vino for me🍷🎛🔌🎚📻

Thanks Terry. That Q513 transistor looks similar to a PNP #151-0622 transistor in my Tek 2465A DV scope's Siemen's Hall-Effect sensor controlled fan motor board. The first time I have seen a transistor with three painted stripes on its back.

So Google figures that I need a 5 second ad for a multi-kilo buck MSO Series 6 prior to viewing your video. Ironic, no? Vintage test equipment, yes. Go Terry, go!

Hi. Thanks for this video and for taking the time to teach to repair equipment instead of throw them out. An older ham Operator just give me this oscilloscope and the problem that I have it's that the horizontal line does not cross below the center mark of the screen. I don't really have any knowledge of this do you know where to adjust this line? thanks you in advance Peter.

Very cool

Great videos! But some minor safety advice fro all who watch. Be careful about touching heat sinks of high voltage transistors. The collector is often tied to the heatsink especially when it's board mounted. There could easily be several hundred volts on those deflection drive transistor heat sinks as demonstrated.

Terry, you should make playlists for Solid State Sinema, Tube Amp Theater, and your own builds (could title those as D-Lab Originals, maybe?). Makes it easier for folks to keep up with their favourite series of videos.

Nice video. I have a 4550 that has some issues. I was going to fix it, but the cost of parts outweighs the cost I paid for the scope. It needs a couple of panel pots and they're hard to find.

Nice!!

Nice old scope. I love heathkit stuff to. built a few of them in my day. Bot not all of thier stuff is as "easy" to get into and fix. in fact im working on an old transistor checker and video will be up very soon.

Picked up the 5Mhz model, the horizontal sweep works but is distorted, more like the time base circuits are wonky. There are a few resistor in the high voltage section that are nice and crisp, hope the ICs are not blown.

It's so rich that someone took the time to log onto RU-vid and give a thumbs down to this video. I guess Dick was here, yeeeaaaahhhh.

For a hobby I’m just getting into tuba amplifiers and simple circuit transistor don’t need no fancy 600 or thousand dollar+ lab scope. I have been picking up old scope signal generator power supply for free or as cheap as $20 for parts doing simple fixes and coming away with great operating gear for my hobby.

what is the difference to the 4510 compaired to the 4530 that im waiting to arrive?any major differences that you know of?

What's your technique for finding replacement transistors? Most of us end up trying NTE's site.

Just a thought, but making a link to your ebay store might be a sump'n to ponder.

Fm transmitter with tubes pleaseeee Terry! :) greetings from Argentina!

Hello, good morning. Sir, I bought a Tektronix 2465 300 MHz oscilloscope. It turns out that when turning on it takes a while for the flash or the image to appear, it is an analog oscilloscope, could you help me to know if the fault is serious or if it is due to lack of maintenance, The equipment turns on but the screen is displayed after a long time, help me to know if it is something serious please

Two hekitscopes,what?!👍🔌🍻

Is This The Scope You Picked Up At The Kalamazoo Ham Fest ?

do you drink while you are doing this?

Drat! Why couldn't that be a Textronix 465B Oscilloscope with Short Traces !?!?

i just bought a heath kit model 10-4225...

Walter white is you?

why are you eating on tv...?