Відео

You sound just like Uncle Doug, nice video!

You got some great deals! I built a big unit, has all three in one cabinet with huge Simpson meters ! 3 x bulbs with switches!

had one of these, some caps were going bad and the transformer crapped out sadly, now it'll be a part donor for projects and such

I read that the bulb should be 1.5 to 2 times the device you're testing. What are your thoughts on the Tenma 72-1095 Variable Isolation Transformer? I have one

Excellent

What projects/repairs/testing do you need the variac for if you don't mind me asking?

www.stancor.com/pdfs/install_sheets/0037-6216.pdf

Out of tolarance is out of smolerench. Fuse it if you like, a very good idea !

Your test inherited equipment ensemble looks much like mine.I built my test bench tools up starting in 1962 when I graduated from RCA Technical Institutes. After my tour in Nam with the US Army i pocked up an IBM designed Tektronix portable scope. I do use my gear in restoring Vintage radio sets. Forget ESR with the cap, no one even had a clue what that was until the advent of switching power supplies. RCA built home equipment to Mil- Spec designs and quality. You wont find cheap paper wax caps in a WR-50 B. The resistors where also a high grade type. Testing each component for accuracy is a total waste of time if you have never fired up the test instrument. If you have a Variac with parameter monitoring you don’t need a dumb dim bulb tester, thats for amateurs.

Why not just disconnect the capacitor and leave it in place. The modern replacement is very small and can be placed under the old one. It is normally not possible to increase capacitance due to valve limits.

I just got the same model from a friend. His has been in his attic for maybe 50 years. I appreciate seeing exactly how to bring it up slowly, as so many recommend. I didn't see a followup video in your listing. Can you reply with a summary of further work you did on this scope? Thank you.

Great video. These couple of videos show "isolation" labeled products that one has to be very careful with. I guess this shows how one has to be careful with wording and verify in practice. Tripp Lite "isolation" transformer. ua-cam.com/video/M84EHZ5hPAc/v-deo.htmlsi=xYoBQZtPcpm_Q_j2 "Variac with isolation transformer" ua-cam.com/video/8o7HtGTvBvA/v-deo.htmlsi=9kedZK-sP8bzlcbS

Hey, thanks a lot for taking the time to explain everything in such detail and with great demonstrations. This is definitely one of the best safety videos I've ever watched. I really appreciate it.

what does it even do i dont understand the point of it and im trying to figure it out, if you anyone can tell me what its for that would br great thank!

Super helpful! thank you!

Reply to Erik Burman: The human body's resistance varies widely depending on who you are, what your body chemistry is and most importantly, if your skin is moist or sweaty (usually with a lot of salt mixed in). It only takes a few milliamps of current to seize muscles or stop the heart from beating. So yes, there are a lot of variables.

Very interesting. The best clip on youtube with curve tracer. I have a function generator, including the sinusoid with a maximum amplitude of 24v. Could I replace the 24 V source with the sine wave generator ? I think, I could control the frequency and amplitude. Thank you.

Thanks for sharing a very clear schematic of your setup. This is about the fifth video on this topic I’ve watched today (and the last). But you’ve inspired me to get cracking on building my own; I believe I have couple of old AC voltmeters and ammeters laying around the shop, I didn’t realize I was saving them for this project.

Thx very much for explanation en guidance. Recently, I got one (IBM version) and very happy with it as it brings me back to the times of good history. It came with a DB (decibell) adapter which could plugged in on top using the 0.6mA scale.

What is the formula to calculate the bulb wattage needed related to the device?

How many times did you mutter the sound "uh"? I'll tell you - a pathetic number of times.

Great video, thanks. I have a same signal generator, and try to calibrate it. I had the R9 adjusted to 6V and calibrated all A to F bands without much trouble. But I can not get the wave form on oscilloscope for 455 khz and 10.7 Mhz sweep. Read the instruction which is not quite help since the way it did need crystal. I do have frequency counter. My question is can I calibrate 455 kHz and 10.7 MHz with the frequency counter (with the Modulation switch in Ext without any signal input) instead the wave form? Thank you in advance.

100 or 200 watts is way to high for low current devices like AA5 radios. Just sayen?

Put a suitable sized Jubilee clip (hose clamp) round the top of the capacitor and tighten to protect the aluminium from the side cutters. It will also help keep the top round as unlike the sheet metal held by hand there will be no gaps and it won't slip. Ah! see you saw that idea later in the video. One other thing you mentioned you have a polishing wheel. If you can substitute that wheel for a plain steel wheel or if you have a lathe you can set up a support bar to help hold the can tight against it while pressing and turning against the wheel to press the peeled metal back smoothly. I have stuffed several this way with good results.

Do you have the amphenol leads ?

Just finished to build it. 😁 I struggled for soldering the thick cables, design the panel, and design the BOX. The panel was done in Inkscape with a special extension, Scale, that creates simple gauges like MeterBasic, but since you are already in a vectorial app, then you can change the design as you want. I had to print and scale it a couple of times since once printed on the LaserJet, 1 cm on video was not 1 cm when printed. The box was designed in CAD and 3D printed, unfortunately only after I printed it, I realized that the data sheet with the drawings of the amperometer with holes and screws quotes, were completely wrong! I preferred to file so parts and do some drills on the box instead of change the CAD design and reprint it correctly, since it has to be used only once, and the manual holes were covered by the milliaperometer. I had also troubles to solder the thick cable even with a TS100 solder and the fattest iron. After the some mandatory soldering I switched to screw contacts for the following joins. However it looks very nice, and it seems to work fine also. I discovered that almost all my rechargeable batteries are still good. 😉

Just bought one on EBay for 11 bucks. Maybe I’ll need some parts.

Very interesting, nice and simple. 😎 Thank you.

Hi, this is not the way to restuff old capacitors: this is the way to destroy them,I have no channel on youtube, but if you want I can send to you images where I can show the way I usually restuff old capacitors on vintage electronics. Actually I am recapping a old Mcintosh MX110 (the Medium Version, without 6D10 Tube 1962/1963) and i'm not destryng the can.

I take my Dremel with a high grit stone and grind down the bottom of the can until I expose the steel ring. I then pull that out and remove the guts reusing the phenolic base. I reassemble by putting some two part black epoxy on the inner lip and placing the phenolic and steel ring back in place.

Restuffing cans is the best option. I restored a 1951 Andrea 16" TV that had nine (9!) cans. Imagine putting terminals and external caps for nine cans inside that already crowded chassis. 30 years after I'm gone, some guy will be thanking me for not turning that chassis into a train wreck. Other than the plastic caps replacing the paper ones, it looks like it did when it left the factory and still matches the picture in the SAMs.

Great video, but please get rid of this annoying background sound track. Incredibly annoying and distracting and your presentation stands great by itself without the need for some questionable audio "enhancement".

This thing is more like a grenade than a capacitor! It's a bit crazy to see a capacitor that large yet without any of the stress grooves in it that give away to let it explode more safely out of the top.

1:18 also bond vs Jaws on the train, electric bulb electrodes to the dental work, classic ...

$2 for a 350VA isolation transformer? $5 for a metered Variac? Bargains of the century!

It is called 'The Dark Effect'

For accurate calibration you have to pass 50 microamps through the meter and set the needle deflection to full scale using R2. You then measure the resistance between the input to the meter (left side of R2) and the far side (right side) of R1 and adjust R1 until you have 5k ohms exactly. That is DC and Ohms calibration done. Then you can test accuracy on all ranges for full scale deflection using a reference DC source. If there is any inaccuracies the prescaling resistors need to be checked. Once that is done you can calibrate AC volts using a known AC voltage for full scale. Once again the prescaling resistors values will affect meter accuracy.

You're very welcome, thanks for the comment!

Great vid. I just sold mine last year & you made me regret that a bit. I never cal'd the sweep part so that was very helpful. 👍

😱 "Promo SM"

Hello how much is a good price for a working Simpson 160 with the original case and manual in great condition? Just wondering so I don't over pay as I'm looking to pick one up. Thanks for the video and your time!

Hello, Great video! I was wondering whether you know the size of the Allen Wrench I need to use to remove the selector knob screw?

I watched someone age's ago print out a picture on paper using an inkjet printer, soaked in water I think and applied it to a tin coated piece of sheet metal and it looked amazing! The video had nothing to do with electronics but I could see how it would be perfect for electronic enclosures.... Haven't needed to do it myself yet but I have never forgotten the video, I can't remember what the video was called or who posted it but for some reason I was watching art videos which is standard practice for a polymath like me... I'm always watching random videos or reading random stuff... You only ever need to remember seeing something somewhere and you will find the information when you need it, sometimes you remember more while other times less but you never forget that you know something about the topic that you are currently working on.... Great effort in this video! Pretty underrated considering the amount of view's this channel is getting.... Thanks for posting 😁.

I'm a beginner, but I tried making it. I am thrilled that it was a success！Thank you！

Never actually seen a transformer like that anywhere where I live (finland), I only recall having seen a few large stations that took up the space of a house and a yard, wired off with large metal fences and lots of buildings and electrical equipment, whole place makes a hummmmm sound. One station serves many thousands of households.

The 9 volt battery has 6 cells in series. esr per cell would be - meter reading and divide by 6.

Putting 12V randomly into board points could blow a lot of things up in modern parts...

What is important to note is that most variacs have no isolation at all, one side of the output always gonna be live of it and the other just tapped voltage from it pretty much, you want to use your isolation transformer if you measure anything in live voltage to protect your scope. I got my big Variac first actually way back in time but later I got a very big nice isolation transformer that even have virtual ground. I put a switch on the ground circuit to be able to run either isolated live without ground or together with virtual ground. it is a great thing to have if you were to work on a tube radio that works without both ground and transformer, yeah the death radios and I don´t like them. but you never get better than your tools I always say, but your tools also don´t have a brain you you have to use your own. Just because you have fancy isolation and variacs you won´t be completely protected which you always should have in mind. Don´t put too much trust in your extra safety

Hello- thanks for the video. I ordered a new cover for my meter and it did not have the anti static coating. Can you recommend a spray for this problem? - Phil

I built my tracer a couple of years ago and I made it with two pots which is for both variable output voltage and variable current, this way I can really tweak in the reading parameters I want to get without the need for different input voltages of the octopus, it is a very useful tool to have when you need it