+OkieFats ITCXTC The "little TV" thing happened to me, I scored a Philips 60MHz digital storage scope for 5€ because the guy complained that it was from his father and it was an old TV with a little useless screen that was big and useless and moreover it would only show a straight blue horizontal line and the volume selector had weird numbers (referring to the amplitude knob) and that he didn't find the right plug for the four antennas required (the channel BNC plugs)... When I got on the train carrying the oscilloscope I couldn't think about the scene without bursting laughing out very loud every 5 seconds ... a little TV... :-D
douglas lee Yes it is a true story! A friend of mine told me "look one of my friends is throwing out stuff in his garage, there may something good in there so you should take a look" and I did... ant this is what happened (oscilloscope for 5€) I resisted for the whole scene without laughing at the guy who kept calling it the little TV, but as soon as I got out of his garage I couldn't think of the scene without laughing. People on the train were looking at me because I had such a big smile while staring at my oscilloscope :D
Its because designers knew how to make real tools for engineers back in the day that worked properly for an intended purpose. Today's instruments are all cheap plastic and poor quality components and the buyer is expected to report the software bugs back to the manufacturers because they can't be bothered to get it right before putting products on sale.
Wow! Super nice :) I took electronics in 1985 at a tech school. Love these old oscilloscopes. Wish I could have one and go back into electronics. Thanks for sharing. Your videos are fantastic. Wish I could visit Australia someday before leaving this earth.
Awesome, i've had the HM605 scope in storage for a good ten years and keep meaning to get it out (which I will now). I never understood a lot of the functionallity but thanks to this video I now know how all the features work. Thanks!!!!
I took a dive in a dumpster and pulled out a Hameg 312 that worked well enough to give it a few new pots :) 10MHz, single trace, instructions in German, used a TTL oscillator to calibrate it and it works great now!
+Kevin Zabbo My Hameg 208 arrived this morning. Now have two scopes from the '80s. Both goers and calibrated beautifully. Hitachi V1050F 100MHz Hameg 208 20MHz
Brilliant presentation, Dave. I remember Hameg scopes at college. They were pretty much bomb proof. According one lecturer he said they can bouce without damage. I still have a Hameg 605 60mhz scope and it still works perfectly as does its component tester. Very nice scopes. Thanks for your video. You are a true genius.
Very good advice at 27:30, I recently repaired an hm303-6 with unstable and distorted trace. I tried for several days to figure out what is wrong, then I simply removed the only socketed IC from the TB board and put it back in place and it was like a magic fix!! It was almost stuck and had some rust/dirt on it's legs. Then I cleaned the socket with contact spray and old toothbrush.
I use a 1964 Philips GM5600 electron valve based scope.. got all the service data and schematics recallibrated it and replaced a couple of valves and electrolytics and it works perfect. use it a lot for repairs on SMPS tv and vcr repair.
As far as I'm concerned this was a repair video! As an novice with a descent understanding to electronics jargon goes you've taught me a lot on what to look for and how to make quick fixes and or repair them. BTW: Just keep doing test equipment video's cause I watch them from beginning to end and the length of the video doesn't bother me either.
Nice to see, my first job (while still in school in the 80’s) was repairing those at the Dutch disti, starting with the non-storage models (HM-203 IIRC). Also visited the factory, very impressive. Mr. Hartman believed to have everything in-house even the tools to produce the plastics. Loved the component tester, this video triggered me to hunt for an old Hameg scope to get one :-)
Same here , i need a scope and grew up in the 1990's and have been less than impressed with the latency of digital scopes and their low frame rate. The continuous smooth capability of this analog scope is exactly what i liked about technology and hoped it would take us to futurustic star treck like sci fi, but then came digital and it ruined everything to increase profits.
Oh wow, in secondary school we had one of these as the big posh 'scope for the entire electronics lab. I spent so long learning how to use it and the very similar purely analog versions of them. so many memories!
My best oscilloscope buy ever... I bought a *pallet* of "dead" scopes, including a Tektronix TAS475 and a Tektronix TDS420A... Get this... For FIFTY CENTS!!! XD Opening bid was $1. I waited the auctioneer out and got him to $0.50! It wasn't me being cheap... I was just waiting for an opening bid from ANYONE other than me! It was the PERFECT auction... My old former employer was consolidating two buildings into one, and had an auction to liquidate unnecessary stuff. There were three types of bidders there that day. People who came in looking for a nice workbench or desk or some shelving for their shop, metal scrappers, and _me_. I was the ONLY person there interested in electronic test equipment. I got a nice digital hipot tester for $3, and a load of other equipment... So, the crowning moment of win was a *Tektronix TDS420A*. It had hit the front BNCs. Channels 2-4 worked, and still tested within their calibration, so I simply replaced the BNCs. Channel 1 was dead though. I went online and I found a dead TDS420A that looked like a dead CPU (based on the item description). I got the dead scope, desoldered the ceramic module for channel 1, transplanted it, took the scope into our calibration lab and made sure it was good!!! And I had a working Tektronix TDS420A! I do regret selling it though... I spent 50 cents, plus $270 for the dead scope, Resold the leftover parts for $230... So I had a $40.50 Tektronix TDS420A. That doesn't even mention the other scopes. about half a dozen that I sold for between $20-80 on ebay, one I sold for $180, and one Tektronix TAS475 that I think I got $270 for. The TAS475 had only ONE problem... The plastic in front of the screen had gotten so dusty inside, that it looked like it had suffered CRT burn... but it was fine. Just needed cleaning! I do still wish i'd have kept the TDS420A... It was nice. I needed cash back then, so... bummer... At least I got $500 for it! XD
It is a very good thing to give this away...by this you are maybe giving some very interested (and poor) electronic beginner a good kick start... It is always fun to share and give when possible.
I've just used my Rigol DS2072A-S's signal generator output to recalibrate my HM205. If you ever need to recal the HM205-3, you may find that the calibration instructions for the HM205-2 (which tell you about which pots to tweak) work for the HM205-3. They're almost a perfect match for the original HM205 (only the storage board and built-in signal generator instructions differ as the pots have moved). The HM205-2 manual is the most in-depth of the three.
One of the Best Hameg Videos ever. ! I own a Hameg 207, about 40 Years old and it still works. HAMEGS are "built of catalytic converters" - if they do not make it broken, they do not get it broken. Only the capacitors of High-Voltage System or the ray-tube make limp after really long times. Best Hamegs are from 80ies and 90ies, even when HM 205-X appeared. Best devices for use in educational.Awesome devices!
One extra thing to add. Channel 1 and channel 2 should be copies of each other. What you find on the working channel should be present on the bad channel. Comparing simple voltage measurements should be able to knock it down to a certain area.
Thank you SO much for that tidbit of information - you are, in fact, a savior. Cheers! Now the guy I've been talking to might be less reluctant to give the repairs a stab, with a service manual.
EEVblog Could you do a calibration video for the Hameg? I have the HM205 which is the version previous to the one in this vid, I've looked through the manual and it doesn't give me the calibration info like you had for the Tektronix 2225 teardown and calibration video.
+MechV what kind of manual do you have? Maybe it is a users manual and you propably need a service manual for that? Sometimes they divide it into multiple documents Mine came with a users manual, a programmers manual, a manual for the various expansion modules and a service manual
My hm605 is still using it today from when I purchased it in 1988 and the HN205-3 which I bought 20 years ago is also still working. I love the component tester. I do have a rigol digital
I purchased this exact same unit, from the same very auction I suspect - I think I paid $35, I was also thrilled to find mine worked straight away - totally buzzed
Probably the most enjoyable Oscilliscope video I've seen from you yet. Would have been nice to also show what you were doing with the signal generator, but no big deal there really, and definetly a thumbs up for this one! Great fun seeing what you can produce on the screen, now I want one.
Thanks for the video and the contact cleaning spray tip for fixing the artefacts when turning the volts/division. Fixed channel 1 using this method. BTW, on the 203-6, you have to pop off the orange cap and unscrew the inner knob first. It doesn't just pull out. All the best.
I have exactly that scope!! Love it! Only the time/div fine adjustment has come loose and needs a fix. Storage mode is great too, even if only really useful at AF.
Just got the HM605, similar but 60mhz, and it has exactly the same issue. The button is esp bad on the 1ms and up high it is okay again. It's just a thing with these scopes I guess, I'll have to dick around with that button a bit, should be working after some bumping around on it haha
Hy Dave, You doing awesome reviews about electronics instruments I like all of your videos, especially this one as I managed to get a Hameg HM208 analog scope for free :) as at my work they wanted to throw it away... So I put my hands on it and took it home its working as piece of cake... Greeting from UK a Hungarian test engineer...
There is something therapeutic about lifting socketed dips half way out with a bent regular screw driver and shoving them back in. There may even be a law requiring it for the 7400 and 7404.
Would you be able to make a "short" video on how to fully test a scope. I know you have pretty much covered that here, but it would be cool if you have a shorter one that covered the most important tests.
Actually, you can get downloads of the full operation and service manual including schematics for basically everything from Hameg for free. Rhode&Schwarz, who bought Hameg in the early 2000s, have high quality scans publicly available.
Excellent video! For the red cal button on the volts knob you should use a tiny allen key to screw the allen bolt that hold the shaft . It was loosen. Thats why it wasnt able to rotate the potentiometer.
I am a beginner and have been watching your videos. This one of the $19 Hameg HM205-3 got me excited. Well, you were excited. I found a reasonably priced one owner HM 303-4 (1995) analog 30 mHz scope. It seems to be very similar to the one in your video. It is under $100 after shipping costs. It is working with no known problems according to the seller. I am going for it. Wish me luck with my first oscilloscope.
30:37 I know this video is super old, and you might mention it after I finish this, but note some pins on the vertical input which don't seem to be soldered?
I like test equipment. If you have a problem with that, don't watch my channel. Or here's a really novel idea, don't watch the videos you don't like. But I know that's really hard to do because of my very cryptic and misleading titles.
Err, what was there left to see in the C5 that I didn't show? BTW, this is not MY C5, it is Mal's, it's not like I can spend a day ripping the chassis to bits so that YOU can be happy it's a "full" tear down, and then have YOU complain that it wasn't electronics related enough. *I* find test equipment interesting, and this is *my* channel, so you will continue to get test equipment. Once again, if you don't like test equipment videos, don't watch them. A lot of people like them.
The vertical amplifiers seem to work. You can get a dot centered. I'd lean heavily on the front end amplification. Probably got hit with an overvoltage and blew out some transistors.
Dave! Thanks for the demo of cleaning contacts on the rotary switches. Little tips like that are so helpful to rookies like me. It was fun watching you fix it.
I just recently scored a Tektronix TAS 475, which is an analog scope with digital controls. The thing is really nice! I get those smooth analog traces and digital cursors with frequency counters and stuff like that. About the only thing it can't do is store a waveform, but so far that hasn't been a big deal. Prior to buying it, I used an old Gould 20 MHz digalog scope kinda like this one. It was OK for audio-frequency stuff, but it just couldn't hack anything higher than about 10 MHz.
I got a Tektronix 2336YA on eBay a while ago, worked a treat when it arrived. Only thing is channel 1 seems dead, though channel 2 has been great fun "learning oscilloscopes" with. Seems an odd model though, haven't been able to find much about the 2336, apparently a "ruggedized" military/aerospace model. Has a neat time measurement sorta thingamabob inside the permanent front flipcover as well. Any quick tip on what might lead to a dead channel? No line, no nothing, just a dot on the beam find
I have got a Hameg HM-408 (similar vintage/construction, but a bit more bandwidth and a few more features). As far as serviceability is concerned; yes it uses mostly standard parts and the service manual is easily found, but these Hameg scopes are near impossible to take apart. It is not just a matter of unscrewing and unplugging but also desoldering wires to get where you need to be. If you need to do some work on one of the boards (especially the inner ones); good luck!
To fix the vertical adjustment make a groove at the end of the shaft (at the position of the pot) with a wire cutter. Then squeeze shaft through the pot (retain the pot with the screwdriver so it won't break off the board).
Cleaning the panel switches and pots with contact cleaner is one of the easiest ways to bring old equipment back to calibration. My 70's vintage HP military scope was really bad. (quite a few marks off of scale for voltage) a little contact cleaner and the 40+ year old scope came back to near perfect. *Always* clean contact points before you start tweaking things and adjusting your tounge angle :P
Getting rid of some of my old stuff, there was some mis-communication.I offered my stuff to anyone who would like to use it only to return one evening to see my once beloved Telequipment valve scope being thrown straight through the bakelite case of my valve Philips radio in the back of a Luton Transit van. I just couldn't look and walked on.
When working on these old scopes, how do you use a Variac and an isolation transformer? Do you hook them together or do you use each one separately hooked into the 120VAC power line? Or, do you even need a Variac and an isolation transformer? I would think the Variac is handy in case an unknown condition scope had a major short that you wouldn't want to apply full line voltage to. Is an isolation transformer handy or necessary when working on the old scopes? I'll be working on old Tek 465 scopes.
Looking at the mechanical interfaces coupled with all the through board components and socketing, explains why oscilloscopes were so expensive historically.
Hi Dave, I have a Hameg 604-2 which is very similar in appearance to this one, but has higher bandwith (60Mhz) and lacks the storage function. When I got it there were multiple nylon shaft connectors broken, one in each input module. I could get new parts to fix it, but it took quite a bit of soldering to get to the inside of the input modules. I had to open it because one was the vertical range switch itself that came loose. The parts are nylon and seem prone to crack from age and mech.stress
I used that things in school and university, that was in the 90s. ;) Kind of nostalgic feelings come up. But I remember that none of them looked so clean and tidied. :D Congrats on that bargain!
Got an earlier model (HM204), been using it for over 10 years I think and gotta agree that they're lovely analog scopes. Joy for ever indeed. I'd still love to get a Tek, preferably tube one. The component tester works similar to Mr Carlson's Lab curve/signature tracer, drawing the I=f(V) characteristic for the part. "P for platypus" LOL.
On that vernier issue - I kept shouting at my screen - "Check the set screw ... isn't that black thing a set screw???" LOL !! Did you ever check that out? Did it fix it by just tightening the set screw onto the shaft ??
Awesome video Dave. Did it ever find a new home? This video had a bit of everything. Intro (what is it), tear down, repair, and function testing. It also hit a bit on how to use an Oscilloscope. Brilliant.
Does anybody know a replacement for Electrolube SWC (39:40) as it is no longer available. Looking for a replacement that also can be sprayed on live equipment.
I like building valve guitar amplifiers and my 6MHz BWD only has auto trigger and it doesn't work so the trace won't stand still unless I'm using a square wave which isn't helpful. I am always looking for a modestly priced scope but as you know they don't come along very often.
Dave, could you tell a little more about modulation that you have shown in the video? What was it exactly? Those waveforms seemed interesting. I used a search on your channel however I didn't find anything. Or just tell me what should I search for :)
I got a 2445 for $50, a GW Instek for $25, and an old 465B for $75. My 1963 tube HP scope was free. It had been modified for strobo tach, so the intensity was pegged out maximum and it was essentially being used as a fancy strobe light. I worked, with some minor repairs, but I salvaged the Dutch ECC88s out of it and it is now a boat anchor.
Oh, BTW the 'The Ball and Plate' experiment at university level is a control system that is programmed to balance a steel ball on a flat plate and then the plate moves to make the ball trace out various paths such as circles and the like. That is almost certainly what it was. For school pupils the ball and plate is a timed fall of a ball bearing onto a plate that opens a switch to enable one to determine g by free fall - hope that is of interest. Thanks for a great video!
On a side note, one thing the UTS building is good for is navigation!! When I was in high school and caught the train to the city, I could always find central station again.. head for UTS!! you can see it from almost anywhere!
Nice video- since your last one on scopes on ebay, most of the low priced ones seem to be getting bid on alot. Must be all your subscribers!!!!! Tried craigs list for one, a person had 3 left for 70.00 for over a month, I called and offered 50.00. He did not even return my call! I guess some people have it and some don't. You seem to!!! Thanks for the video and hoping for more of these. Have a nice weekend. Don
Cool, I scored a 65 Mhz dual channel analog for $25.00. The guy kept calling it a little TV! I thought, yeah, this is going to be a good deal!
That's brilliant! I'm guessing he wasn't an engineer lol
+OkieFats ITCXTC The "little TV" thing happened to me, I scored a Philips 60MHz digital storage scope for 5€ because the guy complained that it was from his father and it was an old TV with a little useless screen that was big and useless and moreover it would only show a straight blue horizontal line and the volume selector had weird numbers (referring to the amplitude knob) and that he didn't find the right plug for the four antennas required (the channel BNC plugs)...
When I got on the train carrying the oscilloscope I couldn't think about the scene without bursting laughing out very loud every 5 seconds ... a little TV... :-D
+MrOpenGL Is that really a true story? If so, it's one of the most hilarious things I've ever heard..... As Dave would say "Good On ya"
douglas lee
Yes it is a true story! A friend of mine told me "look one of my friends is throwing out stuff in his garage, there may something good in there so you should take a look" and I did... ant this is what happened (oscilloscope for 5€)
I resisted for the whole scene without laughing at the guy who kept calling it the little TV, but as soon as I got out of his garage I couldn't think of the scene without laughing.
People on the train were looking at me because I had such a big smile while staring at my oscilloscope :D
Cool, very, very cool. I'm going to remember that story. You got so lucky!
Wow, that is one of the scopes I traind basics for semiconductor manufacturing in Germany. Big thumbs up!
those analogue scopes look so much better than the digital ones
Its because designers knew how to make real tools for engineers back in the day that worked properly for an intended purpose. Today's instruments are all cheap plastic and poor quality components and the buyer is expected to report the software bugs back to the manufacturers because they can't be bothered to get it right before putting products on sale.
I like the look of the old 70's Tektronix 456m
Nick Tate k
Nick Tate @ Because it is not made in China 😉
True, but they did cost the buyer many more orders of magnitude back in the day.
Wow! Super nice :) I took electronics in 1985 at a tech school. Love these old oscilloscopes. Wish I could have one and go back into electronics. Thanks for sharing. Your videos are fantastic. Wish I could visit Australia someday before leaving this earth.
$19 oscilloscope, $100 shipping.
***** Still a bargain.
+inademv Yeah, when you don't even know if it is working or not.
Jaroslav Súkeník"Not tested" "as-is" can probably be assumed as "not-working"
+Jaroslav Súkeník just another adventure , try to fix it if it's f....d
Awesome, i've had the HM605 scope in storage for a good ten years and keep meaning to get it out (which I will now). I never understood a lot of the functionallity but thanks to this video I now know how all the features work. Thanks!!!!
I like the crunching sound they make in the dual wipe sockets.
Its possible travel with oscilloscope in flight please answare me
Just scored a fully working HM305 from the Uni skip bin where I live in Newy. Just starting to learn how to use one.
I took a dive in a dumpster and pulled out a Hameg 312 that worked well enough to give it a few new pots :)
10MHz, single trace, instructions in German, used a TTL oscillator to calibrate it and it works great now!
+Kevin Zabbo
My Hameg 208 arrived this morning. Now have two scopes from the '80s. Both goers and calibrated beautifully.
Hitachi V1050F 100MHz
Hameg 208 20MHz
Thank, that just helped me to repair my own HM205-3! Had a broken component tester fuse and dicky knobs as well. Thanks again! Love your blog!
I used a lot Hameg scopes when I was at school.30 years ago. They were very reliable. And I believe they should still be perfect for a beginner.
Not just ror beginners, but everyone
Not a beginner scope, as an engineer this scope can do most of what a scope is used for.
That's a Sweet Scope, and a great walk-through on it!
You offering this scope to a deserving beginner shown strength of character!
Brilliant presentation, Dave. I remember Hameg scopes at college. They were pretty much bomb proof. According one lecturer he said they can bouce without damage. I still have a Hameg 605 60mhz scope and it still works perfectly as does its component tester. Very nice scopes.
Thanks for your video. You are a true genius.
Very good advice at 27:30, I recently repaired an hm303-6 with unstable and distorted trace. I tried for several days to figure out what is wrong, then I simply removed the only socketed IC from the TB board and put it back in place and it was like a magic fix!! It was almost stuck and had some rust/dirt on it's legs. Then I cleaned the socket with contact spray and old toothbrush.
I use a 1964 Philips GM5600 electron valve based scope..
got all the service data and schematics recallibrated it and replaced a couple of valves and electrolytics and it works perfect.
use it a lot for repairs on SMPS tv and vcr repair.
Dave, I grew from boy to man through my apprenticeship with this little beauty, so many happy memories!
As far as I'm concerned this was a repair video!
As an novice with a descent understanding to electronics jargon goes you've taught me a lot on what to look for and how to make quick fixes and or repair them.
BTW: Just keep doing test equipment video's cause I watch them from beginning to end and the length of the video doesn't bother me either.
Would love to see a video on how to use the Oscilloscope for testing, even just some basic stuff.
Nice to see, my first job (while still in school in the 80’s) was repairing those at the Dutch disti, starting with the non-storage models (HM-203 IIRC). Also visited the factory, very impressive. Mr. Hartman believed to have everything in-house even the tools to produce the plastics.
Loved the component tester, this video triggered me to hunt for an old Hameg scope to get one :-)
Same here , i need a scope and grew up in the 1990's and have been less than impressed with the latency of digital scopes and their low frame rate. The continuous smooth capability of this analog scope is exactly what i liked about technology and hoped it would take us to futurustic star treck like sci fi, but then came digital and it ruined everything to increase profits.
Oh wow, in secondary school we had one of these as the big posh 'scope for the entire electronics lab. I spent so long learning how to use it and the very similar purely analog versions of them.
so many memories!
My best oscilloscope buy ever... I bought a *pallet* of "dead" scopes, including a Tektronix TAS475 and a Tektronix TDS420A... Get this...
For FIFTY CENTS!!! XD
Opening bid was $1. I waited the auctioneer out and got him to $0.50! It wasn't me being cheap... I was just waiting for an opening bid from ANYONE other than me! It was the PERFECT auction... My old former employer was consolidating two buildings into one, and had an auction to liquidate unnecessary stuff. There were three types of bidders there that day. People who came in looking for a nice workbench or desk or some shelving for their shop, metal scrappers, and _me_. I was the ONLY person there interested in electronic test equipment. I got a nice digital hipot tester for $3, and a load of other equipment...
So, the crowning moment of win was a *Tektronix TDS420A*. It had hit the front BNCs. Channels 2-4 worked, and still tested within their calibration, so I simply replaced the BNCs. Channel 1 was dead though. I went online and I found a dead TDS420A that looked like a dead CPU (based on the item description). I got the dead scope, desoldered the ceramic module for channel 1, transplanted it, took the scope into our calibration lab and made sure it was good!!! And I had a working Tektronix TDS420A!
I do regret selling it though... I spent 50 cents, plus $270 for the dead scope, Resold the leftover parts for $230... So I had a $40.50 Tektronix TDS420A.
That doesn't even mention the other scopes. about half a dozen that I sold for between $20-80 on ebay, one I sold for $180, and one Tektronix TAS475 that I think I got $270 for. The TAS475 had only ONE problem... The plastic in front of the screen had gotten so dusty inside, that it looked like it had suffered CRT burn... but it was fine. Just needed cleaning!
I do still wish i'd have kept the TDS420A... It was nice. I needed cash back then, so...
bummer... At least I got $500 for it! XD
It is a very good thing to give this away...by this you are maybe giving some very interested (and poor) electronic beginner a good kick start... It is always fun to share and give when possible.
Yep, there's a reason for that! They also don't tell you about the urban cyclone that forms between buildings.
I've just used my Rigol DS2072A-S's signal generator output to recalibrate my HM205.
If you ever need to recal the HM205-3, you may find that the calibration instructions for the HM205-2 (which tell you about which pots to tweak) work for the HM205-3. They're almost a perfect match for the original HM205 (only the storage board and built-in signal generator instructions differ as the pots have moved). The HM205-2 manual is the most in-depth of the three.
One of the Best Hameg Videos ever. ! I own a Hameg 207, about 40 Years old and it still works. HAMEGS are "built of catalytic converters" - if they do not make it broken, they do not get it broken. Only the capacitors of High-Voltage System or the ray-tube make limp after really long times. Best Hamegs are from 80ies and 90ies, even when HM 205-X appeared. Best devices for use in educational.Awesome devices!
I kept my old Hameg just for it's component tester. Why don't all scopes have one?
Great Dave, have one of these myself, great as an analog scope or to track a signal constantly!
Woow memories! I used Hameg scopes when I was doing my HNC electronics in college in the early 90's.
One extra thing to add. Channel 1 and channel 2 should be copies of each other. What you find on the working channel should be present on the bad channel. Comparing simple voltage measurements should be able to knock it down to a certain area.
Hi Dave,
one thing is for sure, the Hameg is a real thing of beauty and a joy forever :-) I have a HM 203-4.
All the best from Germany,
Ralf
I have sold or given away most I have acquired over the years. I only have the Tek 2225 analog left.
Thank you SO much for that tidbit of information - you are, in fact, a savior. Cheers! Now the guy I've been talking to might be less reluctant to give the repairs a stab, with a service manual.
I scored a $300 scope, my school was throwing it out xD
Nice!
EEVblog Could you do a calibration video for the Hameg? I have the HM205 which is the version previous to the one in this vid, I've looked through the manual and it doesn't give me the calibration info like you had for the Tektronix 2225 teardown and calibration video.
+MechV what kind of manual do you have?
Maybe it is a users manual and you propably need a service manual for that?
Sometimes they divide it into multiple documents
Mine came with a users manual, a programmers manual, a manual for the various expansion modules and a service manual
+Manhi40 Arch lol
+Manhi40 Toy are SO SO SO SO SO SO SO LUCKY!!!!!
My hm605 is still using it today from when I purchased it in 1988 and the HN205-3 which I bought 20 years ago is also still working.
I love the component tester.
I do have a rigol digital
I purchased this exact same unit, from the same very auction I suspect - I think I paid $35, I was also thrilled to find mine worked straight away - totally buzzed
Probably the most enjoyable Oscilliscope video I've seen from you yet. Would have been nice to also show what you were doing with the signal generator, but no big deal there really, and definetly a thumbs up for this one! Great fun seeing what you can produce on the screen, now I want one.
Thanks for the video and the contact cleaning spray tip for fixing the artefacts when turning the volts/division. Fixed channel 1 using this method. BTW, on the 203-6, you have to pop off the orange cap and unscrew the inner knob first. It doesn't just pull out. All the best.
Great vid Dave, always enjoy but this was a real surprise the way it came to life, Good show. DAVE from U.S.A.
I have exactly that scope!! Love it! Only the time/div fine adjustment has come loose and needs a fix. Storage mode is great too, even if only really useful at AF.
Just got the HM605, similar but 60mhz, and it has exactly the same issue. The button is esp bad on the 1ms and up high it is okay again. It's just a thing with these scopes I guess, I'll have to dick around with that button a bit, should be working after some bumping around on it haha
Nice. You did do quite a few fixes to the scope than you realised: button, fuse, knots, etc.
Hy Dave,
You doing awesome reviews about electronics instruments I like all of your videos, especially this one as I managed to get a Hameg HM208 analog scope for free :) as at my work they wanted to throw it away... So I put my hands on it and took it home its working as piece of cake... Greeting from UK a Hungarian test engineer...
There is something therapeutic about lifting socketed dips half way out with a bent regular screw driver and shoving them back in. There may even be a law requiring it for the 7400 and 7404.
I uploaded it 1 minute ago, you haven't even watched it yet!
Would you be able to make a "short" video on how to fully test a scope. I know you have pretty much covered that here, but it would be cool if you have a shorter one that covered the most important tests.
Actually, you can get downloads of the full operation and service manual including schematics for basically everything from Hameg for free. Rhode&Schwarz, who bought Hameg in the early 2000s, have high quality scans publicly available.
Excellent video!
For the red cal button on the volts knob you should use a tiny allen key to screw the allen bolt that hold the shaft . It was loosen. Thats why it wasnt able to rotate the potentiometer.
I am a beginner and have been watching your videos. This one of the $19 Hameg HM205-3 got me excited. Well, you were excited. I found a reasonably priced one owner HM 303-4 (1995) analog 30 mHz scope. It seems to be very similar to the one in your video. It is under $100 after shipping costs. It is working with no known problems according to the seller. I am going for it. Wish me luck with my first oscilloscope.
How did it turn out?
How’d it turn out
Great scope! I have had mine for years, it works every time i turn it on. If you take care of it, it will take care of you every time! Great videos!
30:37 I know this video is super old, and you might mention it after I finish this, but note some pins on the vertical input which don't seem to be soldered?
I like test equipment. If you have a problem with that, don't watch my channel. Or here's a really novel idea, don't watch the videos you don't like. But I know that's really hard to do because of my very cryptic and misleading titles.
I have a Hameg too. The HM412, still works like a charm. -- You will love the way the push-buttons are connected. :-)
Err, what was there left to see in the C5 that I didn't show? BTW, this is not MY C5, it is Mal's, it's not like I can spend a day ripping the chassis to bits so that YOU can be happy it's a "full" tear down, and then have YOU complain that it wasn't electronics related enough.
*I* find test equipment interesting, and this is *my* channel, so you will continue to get test equipment. Once again, if you don't like test equipment videos, don't watch them. A lot of people like them.
The vertical amplifiers seem to work. You can get a dot centered. I'd lean heavily on the front end amplification. Probably got hit with an overvoltage and blew out some transistors.
Dave! Thanks for the demo of cleaning contacts on the rotary switches. Little tips like that are so helpful to rookies like me. It was fun watching you fix it.
I just recently scored a Tektronix TAS 475, which is an analog scope with digital controls. The thing is really nice! I get those smooth analog traces and digital cursors with frequency counters and stuff like that. About the only thing it can't do is store a waveform, but so far that hasn't been a big deal. Prior to buying it, I used an old Gould 20 MHz digalog scope kinda like this one. It was OK for audio-frequency stuff, but it just couldn't hack anything higher than about 10 MHz.
No you have perfect timing and content! Thank you for your videos Dave!
Beauty! always reliable Hameg oscilloscope
That's a great find imho. I've not encountered the component tester before, though I did try to build one as an accessory.
I got a Tektronix 2336YA on eBay a while ago, worked a treat when it arrived. Only thing is channel 1 seems dead, though channel 2 has been great fun "learning oscilloscopes" with. Seems an odd model though, haven't been able to find much about the 2336, apparently a "ruggedized" military/aerospace model. Has a neat time measurement sorta thingamabob inside the permanent front flipcover as well.
Any quick tip on what might lead to a dead channel? No line, no nothing, just a dot on the beam find
I've never been a jealous person... until now.
offff Mihnea. :)
Only person i know that WANTS an scope that does not work! I love it!!!
I have got a Hameg HM-408 (similar vintage/construction, but a bit more bandwidth and a few more features). As far as serviceability is concerned; yes it uses mostly standard parts and the service manual is easily found, but these Hameg scopes are near impossible to take apart. It is not just a matter of unscrewing and unplugging but also desoldering wires to get where you need to be. If you need to do some work on one of the boards (especially the inner ones); good luck!
I've had an HM203.7 20MHz scope since 1990 and still working perfectly. Cost me 400 UK pounds back in its day. Its a great piece of kit.
To fix the vertical adjustment make a groove at the end of the shaft (at the position of the pot) with a wire cutter. Then squeeze shaft through the pot (retain the pot with the screwdriver so it won't break off the board).
Cleaning the panel switches and pots with contact cleaner is one of the easiest ways to bring old equipment back to calibration. My 70's vintage HP military scope was really bad. (quite a few marks off of scale for voltage) a little contact cleaner and the 40+ year old scope came back to near perfect. *Always* clean contact points before you start tweaking things and adjusting your tounge angle :P
Old stamping ground indeed, when I was there (1978) the labs were in 'Building A'. 100 years old I reckon. No storage CROs back then.
And I was watching this with my Hameg ! Great Video Dave
Getting rid of some of my old stuff, there was some mis-communication.I offered my stuff to anyone who would like to use it only to return one evening to see my once beloved Telequipment valve scope being thrown straight through the bakelite case of my valve Philips radio in the back of a Luton Transit van. I just couldn't look and walked on.
Thats so sad😢
When working on these old scopes, how do you use a Variac and an isolation transformer? Do you hook them together or do you use each one separately hooked into the 120VAC power line? Or, do you even need a Variac and an isolation transformer? I would think the Variac is handy in case an unknown condition scope had a major short that you wouldn't want to apply full line voltage to. Is an isolation transformer handy or necessary when working on the old scopes? I'll be working on old Tek 465 scopes.
Looking at the mechanical interfaces coupled with all the through board components and socketing, explains why oscilloscopes were so expensive historically.
21:37 that ceramic cap on the bottom looks exploded... (under C3228) might wanna change it if you can get the ref.
Have the exact same model at home, first thing I had it display was a Lissajous curve.
Grande!!
Because they read close to spot on.
Hi Dave, I have a Hameg 604-2 which is very similar in appearance to this one, but has higher bandwith (60Mhz) and lacks the storage function. When I got it there were multiple nylon shaft connectors broken, one in each input module. I could get new parts to fix it, but it took quite a bit of soldering to get to the inside of the input modules. I had to open it because one was the vertical range switch itself that came loose. The parts are nylon and seem prone to crack from age and mech.stress
I used that things in school and university, that was in the 90s. ;) Kind of nostalgic feelings come up. But I remember that none of them looked so clean and tidied. :D Congrats on that bargain!
Super video Dave, great content and very entertaining.
this is really an oldie but a goody!!! love it!!!!!!!!!!!! thanks Dave!
30:30 watch out for them "MILF Caps"
Got an earlier model (HM204), been using it for over 10 years I think and gotta agree that they're lovely analog scopes. Joy for ever indeed. I'd still love to get a Tek, preferably tube one.
The component tester works similar to Mr Carlson's Lab curve/signature tracer, drawing the I=f(V) characteristic for the part. "P for platypus" LOL.
Dave! when you say is easy reparable you can try and replace the boards and see how easy it is! good luck with that!
On that vernier issue - I kept shouting at my screen - "Check the set screw ... isn't that black thing a set screw???" LOL !! Did you ever check that out? Did it fix it by just tightening the set screw onto the shaft ??
Awesome video Dave. Did it ever find a new home? This video had a bit of everything. Intro (what is it), tear down, repair, and function testing. It also hit a bit on how to use an Oscilloscope. Brilliant.
I remember those, we used em at college like 20 years ago ...they were amazing back then lol
Very nice video Dave,
And the nice thing of oscilloscopes is that you can repair oscilloscopes with oscilloscopes :-)
38:19 i actually heve a scope whrere one of the knobs has that problem and the contacts are open but the knob that is broblematic is under the crt
Does anybody know a replacement for Electrolube SWC (39:40) as it is no longer available. Looking for a replacement that also can be sprayed on live equipment.
I like the Hameg scopes because most models have built in component testers. Not a bad inexpensive starter.
I like building valve guitar amplifiers and my 6MHz BWD only has auto trigger and it doesn't work so the trace won't stand still unless I'm using a square wave which isn't helpful. I am always looking for a modestly priced scope but as you know they don't come along very often.
It's pretty safe to say it's nice, it's friggin' EEVblog!
Dave, could you tell a little more about modulation that you have shown in the video? What was it exactly? Those waveforms seemed interesting. I used a search on your channel however I didn't find anything. Or just tell me what should I search for :)
10:21 you're not talking about the Rigol there, are you?
I got a 2445 for $50, a GW Instek for $25, and an old 465B for $75. My 1963 tube HP scope was free. It had been modified for strobo tach, so the intensity was pegged out maximum and it was essentially being used as a fancy strobe light. I worked, with some minor repairs, but I salvaged the Dutch ECC88s out of it and it is now a boat anchor.
Oh, BTW the 'The Ball and Plate' experiment at university level is a control system that is programmed to balance a steel ball on a flat plate and then the plate moves to make the ball trace out various paths such as circles and the like. That is almost certainly what it was. For school pupils the ball and plate is a timed fall of a ball bearing onto a plate that opens a switch to enable one to determine g by free fall - hope that is of interest. Thanks for a great video!
For $19 this was a steal, Dave! I paid $45 for a model very similar in spec to this one about a year ago.
On a side note, one thing the UTS building is good for is navigation!! When I was in high school and caught the train to the city, I could always find central station again.. head for UTS!! you can see it from almost anywhere!
Next cab off the rank.....what a Bobby dazzler.....real electronic service terminology....omg I love aussies
Great job Dave, amazing video! Oscilloscopes are pretty awesome!
"we get ourselves a letter, the letter P for... platypus ! " i chuckled
Sweet buys!!!Gotta get a few more......Love the Dinosaurs.....
Nice video- since your last one on scopes on ebay, most of the low priced ones seem to be getting bid on alot. Must be all your subscribers!!!!! Tried craigs list for one, a person had 3 left for 70.00 for over a month, I called and offered 50.00. He did not even return my call! I guess some people have it and some don't. You seem to!!!
Thanks for the video and hoping for more of these.
Have a nice weekend.
Don