Hi. I saw a vid of yours from last year about a VIZ 707 dual power supply. I have a 707A that I have uses most everyday since '83. Now it needs some repair. I saw you had a schematic for the 708. Can you please provide a copy or tell me where I can find one for my 707A. i will check back here periodically. -Thanks!

Can I please get a copy of the manual/schematic?

Can I please get a copy of the manual/schematic?

Hi, when you were working out the current in the circuit you forgot the internal resistance of the meter that was measuring the voltage across the resistor. I'm assuming a resistance of around 10Meg Ohm of the meter that was across the ~10Meg Ohm resistor so in parallel a total of 5Meg Ohms. Wouldn't that skew your results? What did I miss?

Do you know anybody that can fix these I have one I love it to death I'm in the Tacoma Seattle area

Great video on a nice piece of equipment. Thanks!

Nice scope. I have a 2245 (along with a few more analogue, that I don't use, and 1 new digital)

I have the very same unit that i used to use on my previous job, unfortunately it needs calibration or repairs, It works at 10 MHz but any thing lower it does not. I do not have the heart to chuck it into the trash can, as I am living in a caravan and do not have any access to a workshop as i am retired as well, I live in Australia and if you are interested I would send it to you as a gift from one retiree to another.

Thanks for the video! I just inherited one of these but it is dead (no display, no output). Would you happen to know where the fuse is located? Thanks in advance.

I think Tektronix had better CRTs, comparing 1710 to a Tek 454 has a sharper trace. Comparing circuitry, the h/p used fewer parts. My experience with this vintage of h/p test equipment positive. I have an L band generator (can't remember the model) from the early Sixties that was dropped hard enough to snap the front handle off, and the attenuator is still accurate! The traveling probe coaxial cable which is made of silicone looks a little crispy and crunchy

My university uses these units in our physics lab. This video was a great way resource since I forgot to take an image of the front and wanted to make sure I got the display specs right.

Bruce! I had a quick question on an SX-850 that I recently acquired. Do you have an email I could shoot you question to?

Oh, how many guises these come under….lots, lets list all the ones I know of. The original manufacturer is Hang Cheng of South Korea, but they were made in both Taiwan and Japan too. There is a whole list of 20MHz models: Aaron BS-601. (My first Oscilloscope) A. W. Sperry 620C Brunelle 2988 Degem 112 Dick Smith Q1240 Elenco MO-121 Hung Chang OS-620 (Actually what the 20MHz version IS.) J. D. R. 2000 Neotronics OS-620 Pantec PAN-8022 RaTronic DI-8022 Ramsey 2200 Tenma 72-720 As yours is a 35MHz model, then it is a 72-735, but it could just as easily be an OS-635, J.D.R. 3300, Meguro 1253 etc., etc. So if you need the circuit and cannot find it online, just look under any of these rebadged clones. There are some swanky 50MHz models too, Hang Cheng OS-650, Aaron BS-625 etc. Unlike H.P. Or Tek scopes, these are very well laid-out mechanically with quite a bit of open space inside and are thus easy to get into to maintain and fix. Tek and H.P. Are brilliant at the electronic design, but the cabinet and chassis layout often leaves a lot to be desired!

Hello. Could you share where I can download this wonderful software?

I used to calibrate both of those. I worked in a US Army calibration lab for 37 years..

nice video - thanks!

Hi Bruce, it is great to see another electronics KZbin channel producing content, you have been making videos long before I started doing it and have a great collection of videos, that being said I have a couple of suggestions to help you improve the videos a bit. The first is to try and use a tripod or camera mount whenever you can, handheld camera is ok in some situations but it is always a good idea to use a stable shot whenever possible as it gives a better viewing experience. The second suggestion is to try and do the videos in a higher resolution if you can, right now they seem to be in 640*480 which is a bit on the low side these days, I don;t know if this is a limitation of your camera or something you are doing when you edit it, if 640*480 is all your camera can do then obviously there is little you can do to improve that unless you upgrade the camera to something newer, most relatively modern cell phone cameras are actually pretty good so that is an option. When I started doing videos myself I used my old iPhone 4 as a camera for quite a while until I purchased something dedicated to the job, you definitely don't need 4K or anything like that, but even going to the next revolution up of 1280*720 would make a big difference, ideally you can get to 1920*1080 as that seems to be the optimal resolution for this kind of thing, but as I said, even getting 1280*720 would make a big difference to the video quality. I hope this helps. Scott.

Do you know the year these were made ? Sorry in the early 80s thank you. Because of the high impedance, you can use this on vintage tube equipment , and high frequency radios. Correct me if I'm wrong.

Dear Sir, where can I purchase one of these ?

Thank you, very interesting but get a steady camera please. Also, the camera is out of focus most of the time.

Hello Bruce, I'm a retired hobbyist and have a couple of these boxes. They're both in dire need of recapping. Would you recommend which brand and model capacitors I should use? Thanks

Unsharp

Where can I get a manual with schematics for the PSG520?

Thank you for a real demo of this frequency counter. Other videos only show it turned on or taken out of the box. I like how to demonstrated in the KHz stepping 100KHz at a time. Then a step of 1MHz at a time. I see a 1M-ohm input. Do I need to do something to match impedance from the IF of a radio? I am sure I need an attenuator for the output of a QRP transmitter.

Awesome, thank you for showing this.

Perfect for audio!

Im lucky to have the same Philips counter, made in Sweden. 😊

Nice work my friend. It takes away the drag of having to take and record the manual readings. Can you provide a link to the chap who wrote the code...Mr Patel...is the code Open Source...can you share it please or provide your KZbin audience with the opportunity to approach the author of the code...? Many thanks in advance.

I used BK Precision equipment in high school electronic classes taught by a retired Boeing engineer, and years later I've been collecting some for my own use. Including a 1570a dual-timebase/quad-trace oscilloscope, that came to me in mint condition in the original box with manual etc.

in marantz 2226 user manual, they tested 2226 with this model.

Thank you

Nice review but I am trying to repair my 9020. My does not have a good square wave out of the calibrator circuit . I am also trying to set the 264volt supply to 260v. I would like to see some of the internal boards and troubleshooting tips.

Hello Bruce, hope you are well. My name is Juan, from Rio de Janeiro, Brazil. The subject of precision AC voltage dividers is a rarity among the excelent video makers in the Internet. I very much appreciate your contribution. Many years ago I purchased one of these, apparently a surplus from the military. No manufacturer's marks but I believe is at least 60 years old. Still accurate and very well preserved probably due to sturdy construction, especially the switches. The unit have 4 decades with a zero and +11 step position each. I could never find anything about this particular unit. I bought it without a case so I manufactured one myself. It would be interesting to elaborate on the use of "ratio boxes" in bridge applications, particularly to measure capacitance and inductance. Looking forward to more of your interesting videos, and wishing the best for you, Juan.

I love the inside suprise. Ill keep mine forever.

I have one of these scopes but my square wave is not as sharp as yours on the up and down angles.

Thanks for the decent presentation. As a supplier of new and used T & M equipment, Eurias (in the Netherlands) still has a few of these VBF8 filter instruments in stock. At a price level that is well below the price tag on newer models. There are VBF8 variants with elliptic sharp roll-off, and also a few more with a 8-pole Butterworth response. These are listed in the webshop that Eurias operates, and they can be configured on order to either 120 VAC or 230 VAC mains supply.

Cześć. Kilka uwag do opisu pod filmem. Rozdzielczość przy pomiarze prądu nie wynosi 1nA, tylko 10nA. Maksymalny mierzony prąd to 2A, nie 10A. Brak oddzielnego wejścia do pomiaru prądu. I bardzo ważna sprawa: model 175AV nie mierzy TRMS, tylko wartość średnią.

oh I see yours is also missing the HP logo, maybe they drilled the two holes too big ? since it also happened to mine.. did you manage to hunt down a new logo for it ?

Love this !

Please I need the diagram schematic, my osciloscope is damage

Nice SSG.

Hello sir. I just got one of these second hand but it did not come with a manual or the cables. I think I've been able to find the manual, but do you know what cables I should buy for it? I see several different types listed in both eBay and Amazon, but I want to make sure I purchase the right ones. I'll mostly be using this for hobby activities (rust cleaning, nickel plating and such). Thank you.

Thank you for the video! I'm looking at purchasing one of these on eBay (for parts/not working). Could you give some details as to how you calibrated yours and the modification you made? I would greatly appreciate it!

So why are function generatirs different from sine wave. Generators

I bought one of these a few years ago. While it does regulate well, it's output is incredibly 'noisy', and hardly 'laboratory grade". Have a look on a CRO and you will see massive switching spikes. I use it to run a 12V pump, or charge a car battery., nothing more.

Thank you for sharing the information about component testing...i did not know this until now.

How much did these cost new back in the day?

Hello! I just gained about a 100 piece collection ranging mostly between 1900-1930. GR/L+N/Wes Im trying to educate myself and find contacts. Interested in looking?

Is that resistor box what they call a decade resistor box? Anyone know? Thank you

I just got one of these wavetek function generators as part of a lot sale that i bought locally, Very good video very interesting and informative, hope i can find a users manual so i can learn how to use it to troubleshoot stereos and reel to reels. Thank you for the video bap8guy.