Відео

Hi, I'm going to pick up a working 465B tomorrow. So I watched your video series with a lot of interest. I also noticed you used a Fluke 8840A which I also happen to have. One in pristine condition but unfortunately the current measurement doesn't work. Last time I checked the fuses were okay. I do have the service manual but have not worked on it yet. I was wondering if you could give me some tips or areas of interest if I would start working on that part. Voltage measurement DC and AC are perfect, Resistance measurement 2-wire and 4-wire are also perfect. I would be really happy if I could get current measurement working as well.

When are you getting in an Audio Precision APX555 🤣

Did you ever get the board finished, and can I buy one? I am in the UK, but could probably provide a US address for you to ship to.

Your channel is so underated

Very clear and understandable, thank you. I'm gonna check out some other stuff from you.

I think Paul Carlson uses Tarn-X for situations like this. Great videos! Good luck! - JRH

Did you tried to use ultrasonic cleaner on this or similar switches? I do a lot of vintage hi-fi stuff restoration and i was thinking give it a go with ultrasonic cleaner to clean those old alps lever switches, ofc plan is to completely dismantle them and they put them in cleaner.

I made my own resistor decade box. It has no switches, but seven columns of nine 4mm sockets with the resistors soldered between them. You choose your resistance by plugging into the appropriate sockets. If you need to sum resisors from two columns, there are heavy gauge jumpers. There is no residual resistance, and the tolerance is 0.01%

check the other resistors and see how many are out of tolerances and maybe you can find another unit you can scavenge to make 1 unit

Show some tunel diodes and other inusual stuff

Great video, Can you do another using the same curve trace, as I have a 577 and a much older 575 , but using Jfets and if possible V-fets as I have a few V-fets of unknown health and these are very rare devices .

i use a WEP 948 90W which a solding and desoldering. for solding i use at 640 f i havent had any problems but desolding side the only problem i have is the tip got fused together by using it to hot

Do you have a 575? I’d like to see a video on one of those.

So yes, I want to see more. Not sure how often you use a curve tracer but how about a vide on a real world application then next time you use it during a repair? Also, are there modern equivalents out there at a reasonable price with the same feature set?

Hi, I consider the curve tracer to be one of the most useful measuring devices for component testing. I always wanted to have at least one on my desk, but since I live in the Czech Republic it is basically unavailable to me. So I built at least a classic octopus as a base, good, but not enough, I managed to buy a non-functional copy of the Tektronix TI-210 and fix it, it is a big improvement over the octopus, but the max voltage is 60V and it doesn't have a step generator, so classic transistor tests can't be done. In combination with an arbitrary generator, I managed to create a step image of the transistor, but I am still limited by the max voltage. The new Huntron models are absolutely amazing, which can not only create a curve, but also measure the tested component. You create amazing videos, I always look forward to new ones, I love Tektronix devices and old HPs. I once had this idea, could a tracker be modified to measure tubes? Nice day 🙂Tom

I think you mentioned in a 576/7 video, that one of them had a bad transformer that was hard to source a replacement. I picked up a giant multitap tek transformer in an electonics store recently likely from a 500 series scope, but im not sure. Do you know the model # of transformer you need?

Wow, you have a bunch of curve tracers! Do you have any plans for them or are you mainly collecting them?

Always wanted one, but I don't trust people's packaging skills on ebay

Training is always good, especially on these.. How about doing the same on 576.. maybe check some mosfets and zeners?

How did you get the cap board out???

How does one go about ordering the relay boards, preferably populated, from you?

I think you're the right person to ask this question. I'm doing a restoration on a Tektronix oscilloscope "Do you know where I can get any Tektronix spray paint to match the outer case on Tektronix equipment"?

Hmm just something I need for my lab :) a pulse generator that I will have to go buy a whole new selection of gear just to see if it works. Somehow I do not think I can get the wife to agree to that. What is the tube that is in there??

I don't have anything this big, but I do have an HP 6060B electronic load. In addition to static load testing, I can also do transient load tests that can reveal regulator performance.

Now you made me put one of these on my "watch" list :)

You might consider getting a couple 100X scope probes, many of the newer 10X probes cannot handle the voltages in vacuum tube circuits.

i have one of these, working. haven't powered it in about 30 years

I had the same mess with a 5335a counter. Total mess, but fortunately IPA cleaned up the liquified latex well.

I have 2 of these instruments. First one was free but totally dead. Turned out that a couple of tantalum caps (100uF if I recall) in the +15v supply were shorts causing that supply to fail. Every other supply rail uses the +15 as a reference so with the 15 dead they were all dead. There are a ton of tantalum’s in this instrument. It has recently started going into cal mode every 30 seconds or so and I haven’t checked it out yet. You’ve given me a couple of ideas of where to start. Great video - I’ve not found much info on this model out there. It is a beautiful instrument with all the cast aluminum card cages. It was expensive back in the day but would be impossible to manufacture today.

Great troubleshooting and repair work once again Wizard! Really enjoy and very grateful there are guys like you who freely share with others your insight and talent working on this equipment.

I wonder if the voltages of signal involved carry over the transition between types of rated contacts, leading to micro-arcing that increases the contact resistance?? You should have less than 100milli-ohms on low level rated contacts.. even less than 50 milli-ohms is achievable. I ha e measured as low as 30 milli-ohms in our lab, using Kelvin leads. Exceeding very specific current and voltage ratings will lead to dramatic increase in contact resistance over time and cycles. Given the signal levels this generator can achieve, if that is routed through the relays, I suspect this is the cause of failure mode.

What did you replace the latex pads with?

Chasing Ghosts in the Machine..fun.

WOW! 1st!

I have the wavetech sweep pulse generator that I would like to calibrate. I see you using a distortion analyser for the calibration of your unit. I was wondering, could I use a spectrum analyser instead of the distortion analyser as I do not have the said equipment.

Please, tell me , where the black wire from the twist sensor connects to the board. The black wire came off the board and I dont know where it was soldered. Its a small board at the base of the handle.

I think this Mainframe was 500Mhz from Memory

Do you know what i can do to get the back light to come on, on the hk710? Everything else works except that light. Thanks for any info.

You sure know that the temperature compensated zeners have internally i series one or more diodes. That/they eliminate the appearance of the “forward” voltage, i.e. the 0.6 V knee. The temperature compensation results from the series connection of positive and negative drifts.

Nice to see any old HP unit back in use, great work. The 0.1% resistor was way overkill I think ! but hey it works...cheers!

@5:50 I would pull those caps and check for them leaking, I’ve seen plenty of those big caps leak and still be perfectly functional, don’t want to end up repairing eaten away traces.

I recommend checking the hulking electrolytic caps anyway. Reason: I recently repaired a HP8901A modulation analyzer and lo and behold, its big cap had spilled electrolyte on the PCB. Eating away some of the green PCB solder resist. HP being HP, the gold plated PCB tracks shrugged off the electrolyte but good it was not obviously. I ended up finding myself a used, but not leaking, cap at a ham fest. Prices are like you mentioned: "off the scale".

Just bought a B version to sit along side my A version. Listed as 'DEAD'. Sooo looking forward to repairing it.

11 minutes up, 20 views begun, and 4 thumbs up.

Discontinued, buy a new one. Hakko becoming Apple. F..k 😡😡😡them Hakko is rubbish now!

I have a 475a dm44 scope I bought new in 1976. It cost $3900, roughly the cost of 3 new Volkswagen 1300’s. It still works but needs cleaning and especially the switches are intermittent. Could you do a refurbish for me?

I have spent many hours maintaining a fleet of PTS1000 and a few PTS500. You should get a schematic and block diagram to fully understand how to adjust the synthesizer. As these units will show its age, you may need to adjust the potentiometers that sets the main VCO with-in range for each 10 MHz step (they are reachable under the metal tape strip). If the oscillator deviates too much the signal passing through the cavity filter will be attenuated, the filter is just a few MHz wide, and thus give very noisy or no output on that particular 10MHz band. The VCO is mixed with a signal from the decade modules and also from a 10 MHz comb spectrum in a way that any drift from the VCO will be cancelled out. Often the 15-turns pots developes back-lash and tuning will be hard or impossible, but swapping for new pots is no big deal, just a lot of work.

It would have been nice to see the decades rotated to see if output F matched the selection through the array

Hi Zen, I acquired one of these veeeery cheap ... no transformer, blown fuse, and burnt front-end components. I rebuilt the power supply using a scavenged transformer from an old Pioneer stereo, replaced all electrolytics and several shorted Ta caps, and a couple of dead chips. Calibration was okay, except the frequency max was a bit low. More work than was warranted, but a great learning exercise ... and fine for what I use it for. Cheers from DownUnder, Ian

Hello, i want to source 60vdc, but I'm able to source 35vdc. System says it is limited by interlocking. Could you please suggest me a solution?