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My newest electronics tool

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jknightandkarr
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My newest electronics tool

Postby jknightandkarr » Tue May 09, 2017 6:15 pm

20170509_173115.jpg
(898.22 KiB) Not downloaded yet

A device my grandfather had laying around, and after seeing a youtube video. I know what it is. Not really sure how to use it yet, but I will. 8-)

Joe
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Re: My newest electronics tool

Postby Granz » Tue May 09, 2017 10:05 pm

Looks pretty cool. I have never heard of a resistance/capacitance generator (I think - can't tell for sure with that washer in the top-left screw hole) bridge. Do you have a variac, so that you can slowly power it up (so as to not blow any caps or any other components inside)? Those things are useful tools when working on antique electronics.
Keep us informed, please.
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Re: My newest electronics tool

Postby jknightandkarr » Wed May 17, 2017 4:34 pm

No I don't have any power supplies at all other then an old pc power supply i am going to modify for one i will use. It actually powered up just fine, though it only outputs like 50 volts n the stuff i found on it, supposed to go up to 500 volts. I do have a pdf copy of the manual. Which includes a copy of the scematics. I'd love to rebuild it so it works like new again. Maybe someone who knows tubes can help me change them out for modern components. Should be able to make moduals that just plug into the original tube sockets. I need to play with the unit n see if the status lamp works ok. Its kinda dim, but there could be other issues there other then just the tube being old. Might not be getting full power.

The washer n bolt on top i think he might have put on to have a cord tie up location. Cause there is a little hook on it. Only thing I got.

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Re: My newest electronics tool

Postby Granz » Thu May 18, 2017 8:05 am

jknightandkarr wrote:... I do have a pdf copy of the manual. Which includes a copy of the scematics. ...
Joe

Would you mind posting that PDF? I'm curious as to what a resistance/capacitance generator does.
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Re: My newest electronics tool

Postby jknightandkarr » Sat May 20, 2017 6:57 pm

tmp_19080-EIC_13-565129538.zip
(723.37 KiB) Downloaded 6 times


Here is a zip file with gif files of the manual.

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Re: My newest electronics tool

Postby Granz » Sat May 20, 2017 9:32 pm

Hmmm, interesting. I had never heard of one of these. It reminds me of our old "Fluke." Back in my first shop, we had a tool called a Fluke Differential Voltmeter. This was a special high-accuracy voltmeter, which you used by connecting the probe leads to the unknown voltage, and then adjusting a dial until the meter zeroed out (at the top of the meter - if the needle was to the left then the dialled in voltage was too low, and if the needle was to the right, then the dial was too high. Awkward, but it was supposedly much more accurate than our old analog or digital meters.
This seems to work in a similar fashion: you adjust a dial until a differential meter (the tube) shows a minimum reading (the finest/narrowest line.) Probably more accurate than the other meters back then, but kind of awkward today.
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Re: My newest electronics tool

Postby jknightandkarr » Sun May 21, 2017 5:33 pm

I saw a youtube video a while back n i think it shows if the caps are good or not. Sorta like an oscilloscope only with a totally diff tube

Joe
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Re: My newest electronics tool

Postby jknightandkarr » Wed Jun 28, 2017 8:33 pm

1) Can we move this to the Projects in Progress section?? Decided to do some resto work on this machine. Will post some pics here later.

2) Ok, http://www.justradios.com/MFMMFD.html is this accurate on MFD/MMFD to nF? I hope so cause the machine uses MFD/MMFD and gonna need to replace the "Condensers" as the scematic puts it and replace em with modern same value caps, probly gonna do the resistors too just for no problems.

3) Unit has 2 vaccum tubes http://www.r-type.org/pdfs/1629.pdf http://www.r-type.org/pdfs/6x5g.pdf The first is the eye to tell what the capacitors to test are doing. 2nd says its a Full Wave Rectifier. Now would it be good idea to replace them with modern equivalent circuits, such as mosfets/transistors or should I just get replacement tubes? New if possible. Thanks.

Joe
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My website- Http://titaniceng.altervista.org/

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~Owner, Designer & Builder Killer K.A.R.R.
~Starfleet Captain Joe R.
USS-Titanic Registry Number NCC-1513
Launched: Star Date 48509.9 Galaxy Class, Titanic Sub-Class Starship Max Warp: 15.96

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Re: My newest electronics tool

Postby zappman » Fri Jun 30, 2017 9:52 am

jknightandkarr wrote:1) Can we move this to the Projects in Progress section?? Decided to do some resto work on this machine. Will post some pics here later. .......

Thanks.

Joe


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jknightandkarr
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Re: My newest electronics tool

Postby jknightandkarr » Sun Jul 02, 2017 10:59 pm

Thanks!

Joe
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My website- Http://titaniceng.altervista.org/

My Facebookhttps://www.facebook.com/TitanicElectronicsGames/

~Owner, Designer & Builder Killer K.A.R.R.
~Starfleet Captain Joe R.
USS-Titanic Registry Number NCC-1513
Launched: Star Date 48509.9 Galaxy Class, Titanic Sub-Class Starship Max Warp: 15.96


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