RCA VTVM Operation and Teardown
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- čas přidán 24. 07. 2024
- Check out this very nice 40 year old RCA VTVM that I found at a local Goodwill store. The probe was missing, so I needed to make a probe. You'll see the inside of the Vacuum Tube Voltage Meter, as well as tests using the VTVM. Enjoy!
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*Mike's website(Where I got the probe/cable):
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The unit you have there dates from the 1960s. RCA stopped using the round "meatball" logo in 1968. The newer meters from the 1970s would have the block RCA logo. Even later, these meters were made by Viz, and those have their logo on them. It's a very nice meter to have and yours is in very nice shape.
Thanks for the info, and thanks for watching!
What a great find! I used to work with an VTVM mid 80's early 90's, I used it for servicing Motorola voice pagers, they had a high input impedance. There is still a use for that meter today. Thanks for sharing, brings back memories.
I'm glad I found it. :-).
For some tests a analog meter is better. We used to use analog meters for peaking levels, the DMM's tend to jump around a lot and hard to read when peaking.
Pete Ciallella
True!
I've got a Eico VTVM from the 50's, and need to replace the caps. Thanks for another great video. I think the MZE link will help me find the caps, finally.
Glad you enjoyed the video! Be sure to share my channel with friends, check out my EXTENSIVE video playlists, and rate thumbs up. Thanks
Hi Doug. Outstanding has always. Thank you !
All my best.
Bobby
Very nice meter and a great find. I'm in the process of restoring my RCA, the same model. Mine is in similar good condition except for a little battery leakage.
Great video, lots of great info. and very clear to understand. I got real lucky at an auction. An old Radio man passed and his wife gave it all to the Auctioneer. She told him" just take it all".
I got the VIZ wv-98c. He has already replaced caps in it and is on the money with measurements. I got a whole lot more. 10 Tube testers, 2 Signal tracers, 3 Signal generators, 1 Tektronix oscilloscope, 1 BK frequency counter, 2 Simpson 260 meters, 1 Sencore transistor tester, 6 Multimeters, Capacitor testers new and older ones like Eico 950B, Power supplies, a Variac.
1 Sencore sg165, 1 Weller solder station.1 Heathkit VTVM. Thousands of parts, caps, resistor, pots, light bulbs, all in organizers. Probes, Jumpers, Tools of the trade ect.
I got hundreds of tubes, there were thousands of tubes I could not get them all. I got some Instructional books and Manuals but there were whole sets of them from back in the day.
I also got 150 or so old Radios that are from 1930s to 1960s Am,Fm,Shortwave, almost all need repairs of course.
There were hundreds more radios. Table tops and floor models. I could not get them all. I mostly went for the test equipment.
All testers have been updated and work great, some look like they had never been used. He did great work restoring radios. I just wish I could have met or known him. RIP
I may have 400.00 invested in it all. They only put out so many items at each auction. Took me about 4 months to get what I got. Auctions were every 2 weeks. It's all been sold now.
Thanks for the video for I am just learning to use such meters and work on electronics. I love the old school equipment.
Wow, you did great! :-)
Oh my god,it is beatiful! I love these vacuum tube triodes,x-ray tubes,diodes etc.:)
Glad you enjoyed the video! Be sure to share
Great stuff - very crisp and clear video, and of course quite instructive Looking forward to watching additional videos from you. Just got one of these myself - looks like someone has done some previous work on it, a bit sloppy, unfortunately. Cheers!
These VTVM's are really useful. Glad you enjoyed the video!
Nice find. That is cool. Thanks for sharing
Glad you liked the video. :-)
at a recent hamfest in a $1 bin i found a 3 wire device to replace the "D" cell. i used it in my
WV 98C. i intend to make another D cell sub for a lafayette i own too.
OMG. I haven't seen one of these for many years. Talk about going way back. The first time I saw one of these devices was during my last year in Electronics School in 1970. We were using VOM's and VTVM's with a kind of scaling digital display before that. I remember thinking these things were the greatest inventions ever.
I was thrilled when I found it. Thanks for watching!
electronicsNmore I'll bet you were. Just one thing I would like to correct you on. You said the meter had an 11 megohms input impedance as opposed to a 10 megohm impedance on the newer meters. The VTVM's actually have a 10 megohm impedance with out the 1 megohm resistor that is normally in the probe. The meter is calibrated for use with this 1 megohm resistor. The total input impedence is 11 megohm with the 1 megohm probe resistor in place.
I remember when buying the high voltage probes for use on TV high voltage systems, especially when the transistorized meters started coming out, you had to make sure you bought the right probe with the right resistor or the meter calibration would be wrong.
You're correct.
Nice find.
Very informative and well presented video, thank you !
Glad you enjoyed it!
Great video. I believe that the inductor you referred to is actually a capacitor. The schematic does not have any inductors as part of the circuit. I believe it is C9.
back again. 3 wire device ( mentioned below) to replace a vtvm c/d cell failed. not wanting to tax built in pwr transformer with a diode and cap circuit fed from vtvm filament i opted to use the circuit board from an old 5.7 vdc smps used to charge a cell phone instead. to its output went an ebay adjustable LM 317 regulator board. all this neatly in a pill bottle. finished project fit neatly where D cell once was. gotta love these vtvm's
WOW !!! Who would abandon a jewel like that to the wasteland of a Goodwill store !! And what are the chances that an knowledgeable/appreciative person such as yourself would rescue it !! Amazing !! Good condition units like This go for $140+ on e-bay !! I image you hunt the store every day to find something like this - and only on very rare occasions !!!
You wouldn't believe the things I find. Have you seen my key machine video? :-) I live very close to a very wealthy area, and most of the items I find are from wealthy old men that passed away. The widow and kids want nothing to do with all the items, so they give them away. I'm there a few times/week. The megger was also from the Goodwill store. You'll see that in another video coming up. I just came across a motor worth $400, and you'll see that in another video also. Thanks for watching! Be sure to rate thumbs up and share.
I just discovered your channel and subscribed. Lucky you on where you live! ;) And yes - I gave/will give thumbs up for sure. I'll check out your other videos soon. Thanks for your hard work !! {:>)
could you change the meter fitting to a bnc and use an oscilloscope probe, because it has a 1x and a10x switch which is a 10 meg ohm resistor in it..?
A dual diode tube with a center tap transformer is full wave rectification, even if the capacitor is tested okay on lower voltage, it still can be extremely leaky on higher voltage, thumbs up :)
The dual diode tube is not across the output of the step down transformer, it's used to rectify the AC input from the test probe. Thanks for watching!
electronicsNmore Ok
Minty. I love mine.
Thanks. Excellent.
good one, thanks ...
Super meter!
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May I know na type of the connector in the probe i have also missing testprobe
Hi,how about the *1ohm output current,can to drive LED
Very accurate.
Thanks for watching John!
I bought a Colectro vtvm and it was in pristine condition unfortunately three resistors are burned up and they are 25mohms and they are expensive :-(
I have been buying up all the vacuum tubes at yard sales....50¢
I have a couple older RCA units and a heathkit unit
Useful old tech. :-)
Como conseguir un diagrama para el multimetro presicion modelo # 177 presicion vtvm . Ayúdame. ..
Necesitas pasar algún tiempo buscando en línea como lo haría yo. Gracias por mirar
Since when are average and rms the same???
Been a while since the video was made. Did I mention in the video if the reading was average voltage or true RMS?
They ARE the same if the signal is sinusoidal.
@@EJP286CRSKW Wrong Average value = 0.637 × Vpk RMS value = 0.707 × Vpk
get that duracell battery out of there they are known leakers.
All alkaline batteries are the same.
Interesting how it's not corroded or anything
Yes. The owner took very good care of the VTVM.
I need to subscribe like sharing and download for my channel