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!
@fr68857 күн бұрын
Can I please get a copy of the manual/schematic?
@fr68857 күн бұрын
Can I please get a copy of the manual/schematic?
@KB1UIF29 күн бұрын
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?
@bap8guy29 күн бұрын
The HP34401A had an internal resistance greater than 10Gig ohms.
@KB1UIF28 күн бұрын
@bap8guy Ok, so it was negligible. Got it.
@War-Daddy-SSB-J357Ай бұрын
Do you know anybody that can fix these I have one I love it to death I'm in the Tacoma Seattle area
@user-uv4xe3cq2y2 ай бұрын
Great video on a nice piece of equipment. Thanks!
@ernestb.23772 ай бұрын
Nice scope. I have a 2245 (along with a few more analogue, that I don't use, and 1 new digital)
@turbulent-5823 ай бұрын
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.
@bap8guy2 ай бұрын
That is a very kind offer, but please don’t do it. The post on that would probably be horrendous! You could likely put it up for sale there in Australia and get something for it. I am unsure ehat the problem is, but the fact that it displays 10mhz is promising for repair. Thank you for the offer.
@turbulent-5822 ай бұрын
@@bap8guy Thank you for your kind reply, have a great day mate
@DevilCouldCare3 ай бұрын
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.
@DevilCouldCare3 ай бұрын
Fortunately it was only a poor power cord connection (solved by bending the power supply's prongs). The connection felt snug but apparently not all three prongs were touching. The fuse is just below the power prongs but I have no idea if the fuse is removable or if the whole power connector would have to be replaced.
@user-cr5yy4te3i3 ай бұрын
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
@Fallkhar3 ай бұрын
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.
@illegalmachine3 ай бұрын
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?
@thanhhuynh2723 ай бұрын
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!
@anblabs81683 ай бұрын
Hello. Could you share where I can download this wonderful software?
@txkflier3 ай бұрын
I used to calibrate both of those. I worked in a US Army calibration lab for 37 years..
@bap8guy3 ай бұрын
Wish I could have spent a few hours eith you calibrating this one, maybe I could have learned a few things. It is a very accurate unit in frequency and amplitude. It is big and heavy, but that has to be expected considering it’s age. Pretty much cutting edge at the time. Still very powerful now.
@jeditoto34413 ай бұрын
nice video - thanks!
@TheDefpom3 ай бұрын
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.
@mikemullenix69563 ай бұрын
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.
@bap8guy3 ай бұрын
They should work great on tube equipment. Just be careful to use the right ranges, or if you are not sure, start at a high range and work down.
@bap8guy3 ай бұрын
The 175 came out in about 1983 and I think the earliest copyright on the manual for the 175AV model was 1989.
@rogeroliveira73023 ай бұрын
Dear Sir, where can I purchase one of these ?
@bap8guy3 ай бұрын
Keep an eye out on Ebay. They pop up every now and then.
@thozuduman80834 ай бұрын
Thank you, very interesting but get a steady camera please. Also, the camera is out of focus most of the time.
@julesborges73964 ай бұрын
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
@bap8guy4 ай бұрын
Hi Jules, It depends on what you want to do with them. The original Cornells all had +/-5% 600V capacitors. If you want to use them on tube units and need to maintain the 600v capability then fine, that is your voltage. If you are going to use them on semiconductors only then 100v would be good (and cheaper). Is 5% good enough for your uses? You need to carefully document each of the capacitors you are replacing so you know the capacitance values to look for. I like Mylar, metalized polyester and Mica types (a lot of mine are made by ETR). I have found some good deals on Ebay for some very nice precision Russian capacitors, some as nice as "point" .3%. If you want a standard to check the calibration of your LCR then maybe you want to look into those. All that aside, for me I wanted a set of "standards" and went for 600v 1% or better. It is a more expensive route, but it suited my need to prove the performance of the equipment I am restoring.
@julesborges73964 ай бұрын
@@bap8guy Hi Bruce, thanks so much for you in depth reply. I'll be looking for 600v. I'll try to hunt down some of your suggestions. Thanks again.
@bap8guy4 ай бұрын
@@julesborges7396 there is a business called Just Radios on the net that sells capacitors of this type.
@julesborges73964 ай бұрын
@@bap8guy Fantastic!! I'll check them out. Thanks for your help
@fanviewijsselmeer5 ай бұрын
Unsharp
@user-lt4rh8wi8l5 ай бұрын
Where can I get a manual with schematics for the PSG520?
@bap8guy4 ай бұрын
Sorry I didn't get to you sooner. Over the last 13 years I have collected a lot of information from sources that no longet exist. However, the general scheme is to look up the model number and start reading through the returns. It often takes a fair amount of time and can be frustrating. I have some information on the PSG520. I'm not quite sure how to get it to you. I can also tell you that there are significant similarities between the PSG520 and the SSG520, so look that up as well.
@danielmorgan77026 ай бұрын
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.
@OneDamNote6 ай бұрын
Awesome, thank you for showing this.
@thatampguy7 ай бұрын
Perfect for audio!
@johantoftling55187 ай бұрын
Im lucky to have the same Philips counter, made in Sweden. 😊
@brendanbarbour85687 ай бұрын
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.
@kerryedavis7 ай бұрын
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.
@kerryedavis7 ай бұрын
besides the 1570a and some power supplies and benchtop DMMs, I also have a mint-in-box 1544 dual-trace, 40mhz.
@UgurOnderBozkurt8 ай бұрын
in marantz 2226 user manual, they tested 2226 with this model.
@martinguajardo73848 ай бұрын
Thank you
@allenskaggs65678 ай бұрын
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.
@jgalindes8 ай бұрын
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.
@jj74qformerlyjailbreak38 ай бұрын
I love the inside suprise. Ill keep mine forever.
@allenskaggs65678 ай бұрын
I have one of these scopes but my square wave is not as sharp as yours on the up and down angles.
@eurias-nl9 ай бұрын
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.
@piotr-Garou9 ай бұрын
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.
@bap8guy4 ай бұрын
Yes, you are perfectly right. I was quoting from the Keithley 175 manual and should have used the Keithley 175AV manual. Thank you for pointing that out!😀
@TeardownOZ2CPU9 ай бұрын
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 ?
@MWest-ry9gw10 ай бұрын
Love this !
@christianjacome666110 ай бұрын
Please I need the diagram schematic, my osciloscope is damage
@JamesCPLeung11 ай бұрын
Nice SSG.
@cesarvasquez957211 ай бұрын
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.
@fmashockie11 ай бұрын
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!
@erin1903011 ай бұрын
So why are function generatirs different from sine wave. Generators
@bap8guy11 ай бұрын
A sine wave is a function and can be produced on function generators. But function generators can produce other “functions”, like sawtooth waves, square waves, pulses, triangle, exponential waves, logarithmic etc.
@Balwag Жыл бұрын
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.
@coolbee73 Жыл бұрын
Thank you for sharing the information about component testing...i did not know this until now.
@SDsailor7 Жыл бұрын
How much did these cost new back in the day?
@mainarbor8416 Жыл бұрын
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?
@SDsailor7 Жыл бұрын
Is that resistor box what they call a decade resistor box? Anyone know? Thank you
@SDsailor7 Жыл бұрын
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.