WOW a real ua741, ...Im a 61 and last time I used/saw one of these was in high school. This op-amp simply won't die, in spite of many much better ones around at similar price. Boy to mention the common LM358. I LOVE ELECTRONICS, and I LOVE your videos :)
I came into possession of two faulty LT30/1 Power supplies that were due for the skip, (they're dual versions), so seeing your video first gave me at least some good pointers of what to expect, so many thanks!
Goo Gone is not available in my country, but I've been using Label Off (from Kontakt) with great success. It's a citrus-based solvent, so is very gentle with paint, while soaking up glue. Label-Off from Cramolin (via RS web site) is basically the same thing.
Love the size of that panel meter. My 75W linear PSU has twin meters and they are tiny and hard to read even with my glasses on. Hopefully I will stumble across one of these for my workbench one day. Great video.
Change of pots, liberal amount of contact cleaner on the switches, maybe a total recapping (I would do it regardless), a good clean-up job and you've got yourself a fine linear PSU suitable for a hobby bench. Nice piece of equipment.
Enjoyed the walk through of the schematic. I have a TTi PSU that I bought on ebay that has a problem with one channel which I imagine is similar in design.
Not many faults with this PSU.....but I thought still worth making a video to show my light restoration process, some of the tools used and a wee explanation of how the PSU works. Great wee units!
Interesting!.........I forgot to look up the markings/stickers. Last time I did that was on the Programmable DC Standard I bought via Ebay.....which turned out was from San Onofre Nuclear Generating Station (SONGS)........so well worth exploring stickers etc!
IanScottJohnston i was surprised too, I almost bought some old stock from the USA because they were so much cheaper. Ergonomically Farnell power supplies are such a pleasure to use, I think the switches were a great design choice. I do struggle with the circuit design though, it looks more like some esoteric amplifier 😂
Hey, another good video Ian! I work at Aberdeen university and we have tons of these supplies in draws from the old electronics lab clear out. I might even have a couple I rescued from the dumpster, if you want any let me know and I'll keep an eye out, I think you're local.
Absolutely.......I'm in Stonehaven. Contact me via my website contact form. I need any sort of gear..........By the way, do you know Athol M******* at the Uni?
@@IanScottJohnston Its not ringing any bells, I'm an academic in the Engineering department so maybe we're in different parts? We're currently locked out, but once we get back I'll take a look around for anything being thrown out and if my ones are still there. I have to admit I rescue a lot of stuff for my own work but there was a lot of these Farnell PSUs Mainly dual rail supplies. I thought you were in Stonehaven as Dave from EEVBlog got one of your calibrators in the mailbag and said Stonehaven! Lovely town, I live south of the city too so I go for icecream and chips down there (when there's not a pandemic).
@@bansci Ok....no problem, looking forward to hearing from you regarding any kind of test gear. Athol works in the Electrical Maint. dept. I think he heads it. No worries.
Some time just using good old washing-up liquid wil do the trick with lables and (masking) tape. Much cheaper too. Great restoration and result. Love a good old fashioned analog supply instead of the noisy switch mode supplies.
All the PSU's on my bench have whacking great transformers in them, and no processors. I have no trust of switchmode units as I routinely leave them running overnight or long term on test.
I did that for my PSU same model .... Actually 2 holes , one for supplying the cleaner aerosol and the other for discharging on the 180 deg. opposite...
No not yet.......figured I need to 3D print the front panel parts first and fit the front label plate that's on it's way.........and so there will be a short follow-up video with the re-cal.
Hi. Thanks for the video. Are you the person that makes the little portable voltage references? I think I saw a review of one on eevblog a while back. If so congrats.. those look great. Nice work👍. My friend purchased one and loves it. I will get one too when my financial position improves.
1) It's low voltage on the secundaire side of the transformer , you don't feel anything when touching that big cap. 2) There is a bleeding resistor in parallel with the cap, so there is almost 0 volts in the cap. 3) The powersupply wasn't powered on.
How much would these old supplies have cost when they were new and current models? They just seem so basic and limited in output current compared to current models makes me wonder if they were the budget model of the day.
This was good stuff in its day, along with Thurlby....I guess from your avatar that your growing up with aspirations for a bench full of Rigol supplies, not that there's anything wrong with that!...my bench would be covered in them if I could afford it.
@@andymouse People used to say the Farnell PSU's were better made than Thurlby.........I only ever worked with the Farnell so wouldn't really know. Must admit though, I like having an analogue PSU or two on my work bench.
As it is to stay in my workshop and the caps are sooooo old already and show no signs of leakage I decided not to recap at the moment. Different story if I was to sell it on though.
WOW a real ua741, ...Im a 61 and last time I used/saw one of these was in high school. This op-amp simply won't die, in spite of many much better ones around at similar price.
Boy to mention the common LM358. I LOVE ELECTRONICS, and I LOVE your videos :)
I came into possession of two faulty LT30/1 Power supplies that were due for the skip, (they're dual versions), so seeing your video first gave me at least some good pointers of what to expect, so many thanks!
I love and appreciate everyone how repairs and restores these electronics golden age instruments... Full Respect to you Ian ....
That was the first bench PSU I used as an Electronics Apprentice at GEC Traction in the 70's - Happy times
"Goo Gone" works wonders removing old stickers and tape residue and Naval Jelly does a great job removing surface rust. Thanks for sharing!
Goo Gone is not available in my country, but I've been using Label Off (from Kontakt) with great success. It's a citrus-based solvent, so is very gentle with paint, while soaking up glue. Label-Off from Cramolin (via RS web site) is basically the same thing.
Coconut oil rubbed into the old stickers does a great job and pleasant on the hands :)
I have had static build up on the plastic causing the meter to go wonkers.
TNX 4 the upload! 73 N8AUM
Love the size of that panel meter. My 75W linear PSU has twin meters and they are tiny and hard to read even with my glasses on. Hopefully I will stumble across one of these for my workbench one day. Great video.
The meters are really nice, probably the one thing that makes these old PSU's still worth having one or two around.
Nice video, and a very nice power supply indeed.
Change of pots, liberal amount of contact cleaner on the switches, maybe a total recapping (I would do it regardless), a good clean-up job and you've got yourself a fine linear PSU suitable for a hobby bench. Nice piece of equipment.
Enjoyed the walk through of the schematic. I have a TTi PSU that I bought on ebay that has a problem with one channel which I imagine is similar in design.
Not many faults with this PSU.....but I thought still worth making a video to show my light restoration process, some of the tools used and a wee explanation of how the PSU works. Great wee units!
with sealed plastic bodied pots I drill a tiny hole in the case and squirt my cleaner in that way. It always hits the track.
Sticker on the side says IFR...a local test equipment company which is now part of Aeroflex.
Interesting!.........I forgot to look up the markings/stickers. Last time I did that was on the Programmable DC Standard I bought via Ebay.....which turned out was from San Onofre Nuclear Generating Station (SONGS)........so well worth exploring stickers etc!
The toggle switches are made by C&K if anyone is looking to replace any. China does some OK copies of this type.
I bought some new ones a few years ago to repair a Farnell TOPS 3D PSU.......was very surprised to find they were still available.
IanScottJohnston i was surprised too, I almost bought some old stock from the USA because they were so much cheaper. Ergonomically Farnell power supplies are such a pleasure to use, I think the switches were a great design choice. I do struggle with the circuit design though, it looks more like some esoteric amplifier 😂
Nice find Ian....
Hey, another good video Ian! I work at Aberdeen university and we have tons of these supplies in draws from the old electronics lab clear out. I might even have a couple I rescued from the dumpster, if you want any let me know and I'll keep an eye out, I think you're local.
Absolutely.......I'm in Stonehaven. Contact me via my website contact form. I need any sort of gear..........By the way, do you know Athol M******* at the Uni?
@@IanScottJohnston Its not ringing any bells, I'm an academic in the Engineering department so maybe we're in different parts? We're currently locked out, but once we get back I'll take a look around for anything being thrown out and if my ones are still there. I have to admit I rescue a lot of stuff for my own work but there was a lot of these Farnell PSUs Mainly dual rail supplies. I thought you were in Stonehaven as Dave from EEVBlog got one of your calibrators in the mailbag and said Stonehaven! Lovely town, I live south of the city too so I go for icecream and chips down there (when there's not a pandemic).
@@bansci Ok....no problem, looking forward to hearing from you regarding any kind of test gear. Athol works in the Electrical Maint. dept. I think he heads it. No worries.
Some time just using good old washing-up liquid wil do the trick with lables and (masking) tape. Much cheaper too.
Great restoration and result. Love a good old fashioned analog supply instead of the noisy switch mode supplies.
All the PSU's on my bench have whacking great transformers in them, and no processors. I have no trust of switchmode units as I routinely leave them running overnight or long term on test.
Drill a tiny hole in the pots Ian
I did that for my PSU same model .... Actually 2 holes , one for supplying the cleaner aerosol and the other for discharging on the 180 deg. opposite...
@@ahmedalshalchi I guess it worked for you I would assume
Drill = risk of shavings. If he’s trying to keep original and not replace the pots, probably best to not tempt the fates...
Hey Ian, did you end up calibrating out the slight offsets?
No not yet.......figured I need to 3D print the front panel parts first and fit the front label plate that's on it's way.........and so there will be a short follow-up video with the re-cal.
Hi. Thanks for the video. Are you the person that makes the little portable voltage references? I think I saw a review of one on eevblog a while back. If so congrats.. those look great. Nice work👍. My friend purchased one and loves it. I will get one too when my financial position improves.
Yep that's me..... www.ianjohnston.com/index.php/onlineshop/handheld-precision-digital-voltage-source-2-mini-detail
your finger so close to the big cap at 23:00, makes me nervous hahahaha
1) It's low voltage on the secundaire side of the transformer , you don't feel anything when touching that big cap.
2) There is a bleeding resistor in parallel with the cap, so there is almost 0 volts in the cap.
3) The powersupply wasn't powered on.
I've used vegetable oil to remove stickers from laptops. It works very well...
Does china make a cheap generic version of the cliff quick test
How much would these old supplies have cost when they were new and current models? They just seem so basic and limited in output current compared to current models makes me wonder if they were the budget model of the day.
This was good stuff in its day, along with Thurlby....I guess from your avatar that your growing up with aspirations for a bench full of Rigol supplies, not that there's anything wrong with that!...my bench would be covered in them if I could afford it.
@@andymouse People used to say the Farnell PSU's were better made than Thurlby.........I only ever worked with the Farnell so wouldn't really know. Must admit though, I like having an analogue PSU or two on my work bench.
@@IanScottJohnston absolutely !
Use label remover (from cpc) not ipa and the labels peel off leaving zero residue in just a few minutes
Given it’s age, wouldn’t you recap it?
As it is to stay in my workshop and the caps are sooooo old already and show no signs of leakage I decided not to recap at the moment. Different story if I was to sell it on though.
WD40 will melt the glue and paper. I use it often with no damage to surfaces.
Try WD40 for softening up stickers, that’s what I do