A lot of high quality components and craftsmanship went into this era of kit. Not to mention intricate design. Thanks for an interesting video and good to know that some parts will be recycled.
In the early 1970's, at the HP scope division in Colo. Spgs, the R&D group used Teks to do their design work. I think the copper-nickel-gold boards had heavy gold on them, well worth sending in for gold scrap if you snip off the parts first. Same with the large chassis-mount connectors for card edges. In the early '70's, just before the price became free floating, gold was still bought and sold for $35 an ounce, so they used a decent plating of it until the price shot up when price control was dropped. My buddy gathered scrap bds and connectors (free) for about 5 years till the gold price was floated. He then waited another 3 or 4 years as the US gold price climbed, then had the gold recovered from the bds and connectors and bought a house with it up in the foothills at the base of Pikes Peak.
The gold recyclers are drooling over those boards Don't throw them away, you'll get good money for them, even if you don't depopulate them At a shop I used to work at I had one of those scopes that I used to use, then I 'upgraded' to a Tek 465m that we got from the local air force base surplus Good times :)
I'm curious to see what the impedance of the delay line turns out to be. The high speed / high voltage transistors from the sweep amplifier output stages might also be good to snag.
I was an EE at HP Medical Waltham in the 70s. We could get any test equipment you wanted except Tek scopes. I used a 250MHz HP scope. It wasn't terrible.
@@IMSAIGuy In Tech-school (1986-88) I used Philips, Leader, Tektronix, and HP. Later on I used a HItachi, Sencore and a early LeCroy. I loved the Tektronix. The HP wasn't bad but the worst was the Phillips followed closely by the LaCroy. There was something about how chunky the Lecroy was for what it did and how fast it was and the left handed of some settings put me off. It was one of their first "combi" scopes and I loathed it. The only feature was you could set it up to measure a hours long waveform and save it to a floppy (1993).
That looks like it might share some mechanical components with the 3580A spectrum analyzer. I have one that works electrically, but could use some mechanical help (especially around the front of the crt.) Curious how to reach out and see if we have stuff we could trade…
I have a Hitachi analog scope, made in 1975. Still works fine after almost 50 years. In fact it's my favorite scope (yes I do have a newer Tektronix, as well as some modern digital ones). 60MHz dual-channel, CRT still sharp and bright. Hitachi made good stuff.
Strange - boards and inside parts look like they are from the 70's/80's but hp logo is the revised one from early 2000's (before it was always the "HP Hewlett Packard", later, with Carly Fiorina, it was reduced/redesigned to "hp" like on that scope.
I would totally love to know more about that delay line: what's it made of, how does it work, what's it good for, etc. I'm a bit too young for this stuff (only 36 years), so this kind of equipment is not what I'm used to. Thanks
I have a 26GHz Tek spectrum analyzer that needs a recap. I haven't opened it yet and examined how much damage the leaking caps have done but based on the power consumption of the unit alone and its slightly flaky behavior I may take it apart and repurpose some of the RF components in it. It is sad to do but there's life in another life if you see what I mean.
When I worked for a defense company in the early 80's we had nothing but that major brand of O scopes. One day a really good sales guy got us to buy a couple of these. All I can say is HP makes a lot of really good test equipment but O scopes ? ..not so much.🙂
EEVblog did a repair of a 1740A, almost the same as yours. Took him three vids to diagnose a bad bridge rectifier. He tears everything apart before that. My 1740A is still great.
HV transformer is a must save in my opinion alongside HP custom parts esp the big ceramics... not easy to come by these days and they do fail. Especially the HV trans
Когда думаешь что только в СССР инженера делали странные технические решения ... то глядя на это ХП тоже понимаешь что у наших в принципе все было нормально ...
I hated HP oscilloscopes as had the misfortune of using them at university and at first job and thankfully next job used Tektronix and Lecroy oscilloscopes for years and didn’t look back. Sharper screen better UI, cheaper when it comes to buying active probes and just better overall better then the HP oscilloscopes and then their DSO’s were even worst I actually got rid of it as consistently freezes up and had issues and bought a Lecroy Wave Pro to replace it and a Tektronix TDS. Both were superior and more importantly reliable. Oscilloscopes for complex waveforms and trigger. Early HP DSO oscilloscopes are the reason some older engineers and technicians hated DSO’s Shame about HP is they made the best logic analyzers around to date. Just their oscilloscopes they cut corners and not built nearly as well. Nowadays of course Keysight make the best DSO’s. It when they made the 8000 series is when HP started making proper DSO’s and getting it together. They made great acquisition board but used the cheapest components as far as the PC board goes like buggy VIA chipset, slow processor and just overall poor performance as far as the PC sides goes. Then the UI was garbage.
A lot of high quality components and craftsmanship went into this era of kit. Not to mention intricate design. Thanks for an interesting video and good to know that some parts will be recycled.
Modern version of tearing apart and old TV set for parts to build a Novice transmitter! Great way to start building a good junk box.
In the early 1970's, at the HP scope division in Colo. Spgs, the R&D group used Teks to do their design work. I think the copper-nickel-gold boards had heavy gold on them, well worth sending in for gold scrap if you snip off the parts first. Same with the large chassis-mount connectors for card edges. In the early '70's, just before the price became free floating, gold was still bought and sold for $35 an ounce, so they used a decent plating of it until the price shot up when price control was dropped.
My buddy gathered scrap bds and connectors (free) for about 5 years till the gold price was floated. He then waited another 3 or 4 years as the US gold price climbed, then had the gold recovered from the bds and connectors and bought a house with it up in the foothills at the base of Pikes Peak.
The gold recyclers are drooling over those boards
Don't throw them away, you'll get good money for them, even if you don't depopulate them
At a shop I used to work at I had one of those scopes that I used to use, then I 'upgraded' to a Tek 465m that we got from the local air force base surplus
Good times :)
You saved the Delay Line - YEAH !!!
I'm curious to see what the impedance of the delay line turns out to be. The high speed / high voltage transistors from the sweep amplifier output stages might also be good to snag.
I was an EE at HP Medical Waltham in the 70s. We could get any test equipment you wanted except Tek scopes. I used a 250MHz HP scope. It wasn't terrible.
I hated the HP, then got to use Tek, so much better, then I used a LeCroy wow that was amazing
@@IMSAIGuy In Tech-school (1986-88) I used Philips, Leader, Tektronix, and HP. Later on I used a HItachi, Sencore and a early LeCroy. I loved the Tektronix. The HP wasn't bad but the worst was the Phillips followed closely by the LaCroy. There was something about how chunky the Lecroy was for what it did and how fast it was and the left handed of some settings put me off. It was one of their first "combi" scopes and I loathed it. The only feature was you could set it up to measure a hours long waveform and save it to a floppy (1993).
Probably too late now but Curious Marc loves HP anything and fixes it.
That looks like it might share some mechanical components with the 3580A spectrum analyzer. I have one that works electrically, but could use some mechanical help (especially around the front of the crt.) Curious how to reach out and see if we have stuff we could trade…
It's always a bit sad when you have to finally retire a piece of equipment.
I have a Hitachi analog scope, made in 1975. Still works fine after almost 50 years. In fact it's my favorite scope (yes I do have a newer Tektronix, as well as some modern digital ones). 60MHz dual-channel, CRT still sharp and bright. Hitachi made good stuff.
Here's to new life thanks to this donor. Cheers 🥂
Rest In Peace
Strange - boards and inside parts look like they are from the 70's/80's but hp logo is the revised one from early 2000's (before it was always the "HP Hewlett Packard", later, with Carly Fiorina, it was reduced/redesigned to "hp" like on that scope.
RIP...
I would totally love to know more about that delay line: what's it made of, how does it work, what's it good for, etc. I'm a bit too young for this stuff (only 36 years), so this kind of equipment is not what I'm used to. Thanks
The first thing you need to learn is how to search for information. Wikipedia has pretty good article about delay lines
a gold mine for some through hole parts, build something with some of the functioning modules
True words about HP scopes. Hard to repair because of custom HP parts, expensive for what you got compared to virtually any other brand.
Tek.
I have a 26GHz Tek spectrum analyzer that needs a recap. I haven't opened it yet and examined how much damage the leaking caps have done but based on the power consumption of the unit alone and its slightly flaky behavior I may take it apart and repurpose some of the RF components in it. It is sad to do but there's life in another life if you see what I mean.
If the spectrum analyzer can be repaired maybe you can try to repair it..
Spectrum analyzers are expansive, they deserve some repair love 😄
"back in the day there WAS a lot of matched parts" -> what is it about "was" and "were" that throws so many people?
I'm from newfoundland originally and I haven't heard the drunken sailor sea shanty since I was child haha too funny
I'm from northern MI, and in my 70's. Same here.
So what DO you do? I'm on the BC coast.
When I worked for a defense company in the early 80's we had nothing but that major brand of O scopes. One day a really good sales guy got us to buy a couple of these. All I can say is HP makes a lot of really good test equipment but O scopes ? ..not so much.🙂
Until now. Keysight is the absolute state of the art in scopes!
I own a 1741A O scope with a persistence memory CRT. And the CRT has seen better days but I still want to restore it as it's an interesting bit of kit
EEVblog did a repair of a 1740A, almost the same as yours. Took him three vids to diagnose a bad bridge rectifier. He tears everything apart before that. My 1740A is still great.
Curious Marc would have loved that scope 😄
HV transformer is a must save in my opinion alongside HP custom parts esp the big ceramics... not easy to come by these days and they do fail. Especially the HV trans
Is it me or are Tektronix scopes almost universally loved?
Not just you. They are lovely. I've used them at work and owned many.
What do you think of the 1740A? Mine is still good. EEVblog Dave has 3 vids on fixing one.
My mother told me, if I don't have anything good to say, stay quiet
Когда думаешь что только в СССР инженера делали странные технические решения ... то глядя на это ХП тоже понимаешь что у наших в принципе все было нормально ...
Measure the delay line.
I hated HP oscilloscopes as had the misfortune of using them at university and at first job and thankfully next job used Tektronix and Lecroy oscilloscopes for years and didn’t look back. Sharper screen better UI, cheaper when it comes to buying active probes and just better overall better then the HP oscilloscopes and then their DSO’s were even worst I actually got rid of it as consistently freezes up and had issues and bought a Lecroy Wave Pro to replace it and a Tektronix TDS. Both were superior and more importantly reliable. Oscilloscopes for complex waveforms and trigger. Early HP DSO oscilloscopes are the reason some older engineers and technicians hated DSO’s
Shame about HP is they made the best logic analyzers around to date. Just their oscilloscopes they cut corners and not built nearly as well. Nowadays of course Keysight make the best DSO’s. It when they made the 8000 series is when HP started making proper DSO’s and getting it together. They made great acquisition board but used the cheapest components as far as the PC board goes like buggy VIA chipset, slow processor and just overall poor performance as far as the PC sides goes. Then the UI was garbage.
I love those old Lecroy scopes