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If you are seeing blown tantalum caps carefully test the main power supply for excessive ripple, if there is too much ripple it stresses the tantalum caps and causes them to fail sooner.

Even though I am in New Zealand I couldn't help but go to their site to see all the stuff I cant get here, sure would be nice :)

fingers crossed!

I have been looking for this for sooooo long!

👍👍👍👍👍

Those damn tantalums. Lucky you have power supply issues as it could be much worse.

It looks like a garage craft, but not like serious measuring equipment.

Sometimes I hook my cans up to B+, and dangle the ins and outs to the analyzer/counter/generator/etc. to see if it makes sense. Good work! You are brave! Not to scare you, but it has 5 PLLs. They actually are quite fixable. Mine's still humming out it's phase noise rich sinewave. 73's! W3IHM

11:02 digital: It's not impossible It's just very cost prohibitive with the current manufacturing methods. Like swapping carbon nanotubes for the fiber plain. You'd have to grow the nanotubes on satellites.

Wow, that's some amazing construction. Truly hand-crafted, artisanal test equipment from the "good old days." So many things going on, so many trimmers here and there, too.

Can you 1. Measure resistance of the dead Tants. 2. Measure the DC resistance of each module to see if there is a dead Tant in or something else shorting the DC input?

Yes, Lenses can be very complicated to design, on one of my many visits to the old Hasselblad Factory, I was told that the Zeiss Biogon 38mm 4.5 took a long time to design and calculate, the amount of A4 papers used for calculation was a stack of one meter high ! I had the Zeiss Mutar 2x teleconverter, after I told the folks at Hasselblad how good it was on the Zeiss Planar 110mm 2.0, they got very interested and wanted to learn more, later I was told that Hasselblad had bought a computer from Canada to calculate Lenses. Today all Lens makers use computer software to calculate Lenses, and Lenses today outperform all older Lenses.

Whole pile of cool stuff there, and built to last, must get round to fixing the keyboard fault on my Marconi 2019, looking forward to seeing your wavetek up and running.

Turns out I will be back on my home turf in Palo Alto next week. I am planning to stop in to your favorite electronics store (Anchor Electronics) while I am in the area. Back in my day it was Red Johnson Electronics in Palo Alto and Haltek and Halted Electronics in Mountain View. All those are gone now.

Mostly these days I watch your videos in order to get ready to build a homebrew radio. I am rather old for starting to do this and I am not yet really ready in my life to get started, maybe I never will be, its in the future. There are a few parts of these videos that seem really helpful. I want to develop some innate sense of what things do,,, maybe seat of the pants, as well as a more technical understanding. But there is also how to test, and set up to test, and what I need. This told me I need to build a second set of attenuators at least in some values. I took electronics in about 1974 in high school and when we got to AC I was flummoxed although I passed the course. I knew the rules, some equations, but they were memorized not grokked. Slowly it is starting to make sense.

How hard was it to remove the can on each module?

Wait until you open the M34 module. You will see 10 pounds of stuff inside a 1 pound can. It is all point to point wiring.

First 🙂👍

500 ns switch time?? That's bad!!

10:50 A bit late but I guess the human eyes use the same trick, not many lenses but a curved sensor

Interesting video, but horrible and troubled 'ADHD'-like presentation style. Because of this, it was difficult to watch the video all the way through. (It also contains some small inaccuracies)

thank you

Fantastic explanation. Would love to see more!

We are living in the era of terrible company names.

That perf-board is NOT Wavetek original. I have several Wavetek generators and have never seen anything like that in any of them. The real clue, I think, is the hand written component designations. I suspect the factory waveform generator quit working and this is somebody's cluge repair job.

You have one or more shorted tantalum capacitors inside modules, this is a nightmare

The epson labelworks printers only use 1mm extra tape per side.

I think something that's crazy about the lens design, is that you didn't even mention focussing/zooming yet

Nice demo, but I think it would have been much better if the measurements were made abruptly. Constant current of 500mA at 5 Volts , that's 2.5 watts. Way too much for a little TO92 . The internal junction temperature must have raised near max. And , DMM readings do not reflect measurements for a fixed temperature, as the datasheet graph is proposing.

I recall seeing this in a (surely NS) databook a few short decades ago, maybe 1980, and thinking they would get a lot of use. This video is the first I've heard of the part since then. I'm surprise they're still made.

this explains pretty well tho why it took a (comparatively) long time for compact cameras to gain lenses that went wider than 35mm (equiv.) guess it's just that - harder and more expensive to make light bend around alot more at wider angles

well explained! could SLR or DSLR lens designers use the cell phone field flattener lens type to make a minimalist sise lens for full frame cameras? too hard to grind complex shape in bigger lenses?

Good resistor for a low-pass filter, no?

At 6:25 when you wiggle that board it appears that the wire that is attached to the resistor and goes straight up to the solder point doesn't wiggle. Kind of like that joint might be floating. It's really hard to tell but something you might just double check.

The small signal graph on the last page will tell you what the HFE is. About one megahertz.

WA lenses has more complicated design mainly due to existenece of a mirror in SLRs which mimposes higher distance from lens to film/matrix. Extremly wide lens for large format or rangefinder camera is build of 6 to 8 lenses.

"The Cooke triplet is a photographic lens designed and patented in 1893 by Dennis Taylor who was employed as chief engineer by T. Cooke & Sons of York".

Take a picture of the cable rat's nest! ...quick! - ask me why.... There's also a Molex that feeds the rails to the front. ...yank. see... 73's W3IHM

I´m silently screaming for thermal imaging... Especially dead tantalums are that easy to find that way.

I would be interested in more videos like thsi, i have been trying to research building a triplet telescope for a while but i havnt found any triplet sets so the idea is to find out how to select individual elements, problem is nobody actually explains it well at all. Are there any open source tools for this? Or any actually useful resources?

6:22 i mean a RC mirror set is pretty great and it inly has 2 elements.

I always thought the paint was to detect warrantee violations! 🙂

How did wavetek defend their choice of using these cans for everything? Better performamce, reliability? ITC used this construction method on their oscilloscope, which I have. I've never seen a more abandoned vintage brand. No schematics available or repair anecdotes.

The easiest method to troubleshoot a supply rail short: measure the voltage drop along a wire (or circuit board trace) away from the power supply: I x tiny R in millivolts. You don't even need the internal supply - any current limited low voltage {so you don't turn on any silicon junctions} will work. Also works with AC current source, ie 24vac transformer with 240 or 24 ohm with anti-parallel schottky diodes to limit output voltage. Great way to find which branch on series connected copper traces has the most voltage drop, therefore short. (sometimes only way) I would expect the Exar 2206 is a mod for variable frequency modulation instead of stock 1kHz.

that rms thing confused me a bit

Do any of your oscilloscopes (hameg usually do) have a ct component tester on them if so how do they stack up against the genuine curve tracer!

I have seen those kind of connectors in vhs vcr's. Sony SLV series. They connect the power board to main board as is in here.

I tought your problem wasn't the ps. Last time we saw the PS was being cobared.

When I was working for the Civil Service, we used that Wavetek signal generator and I can assure you that it was very short lived because it was a piece of junk.

When I saw the title I expected more tesla coil zapping was going to occur.