Old tube? HELP RSE NP-7V-12 168810

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Old tube? HELP RSE NP-7V-12 168810

Post by phone_man on Thu Nov 08, 2012 2:23 pm

Hi everyone,

I have this tube(?) and I can't find any info about it. Does anyone know anything about it?tube

Thanks,
Bob

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Resistance is Futile on Thu Nov 08, 2012 5:02 pm

That is a radio vibrator. It is actually a relay that was designed to vibrate. and it produces a modified square-wave to provide High voltage
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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Bill Cahill on Thu Nov 08, 2012 5:04 pm

I can't look. It wants a name and, password from me.
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Re: Old tube? HELP RSE NP-7V-12 168810

Post by phone_man on Thu Nov 08, 2012 6:04 pm

I FOUND OUT....

That is a radio vibrator. It is actually a relay that was designed to vibrate. and it produces a modified square-wave to provide High voltage

THANKS FOR TRYING
BOB

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by sprman on Thu Nov 08, 2012 8:32 pm

they come in diff operating voltages.6 Volts and 12 volts.Somewhere i have 4 .Sprman

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by phone_man on Thu Nov 08, 2012 10:23 pm

THANK YOU. THEN IT'S NOT TOO RARE OR NOT IN DEMAND, THEN. I'LL HAVE TO TEST IT.

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Bill Cahill on Thu Nov 08, 2012 11:09 pm

Guys, you are all wrong. A vibrator puts out an AC voltage to operate the hv transformer for the B+. The transformer is ac. Therefore, the vibrator must put out the ac voltage for that transformer.
The dc part is the solonoid that vibrates the contacts, rapidly, 60 cycles a second, to create the ac needed.
The thing that goes wrong the most in them is the contacts get burned, causing them to quit qorking. It can be repaired by taking it apart, and, cleanning the contacts.
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Re: Old tube? HELP RSE NP-7V-12 168810

Post by atwater10 on Thu Nov 08, 2012 11:44 pm

"The dc part is the solonoid that vibrates the contacts, rapidly, 60 cycles a second, to create the ac needed."

Actually Bill you're all correct ... The contacts you mention though chop the DC provided by the battery system to a condition that acts like AC to the transformer but is not sinusoidal but actually a "modified square-wave" as cliff mentions.

The end product is the transformer thinks it's getting it's AC and does what it does best ... Gives you the high voltage you need to run the radio. Cool
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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Guest on Fri Nov 09, 2012 12:00 am

atwater10 is right on the money.

The primary is charged with one polarity and when it is opened the collapsing magnetic field will induce a voltage. Then the polarity reverses and causes the next cycle or other half of the square wave. Older cars with points work the same way except there is no reversal of polarity. Each time the points open the coils magnetic field collapses causing a pulse on the secondary winding.

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Bill Cahill on Fri Nov 09, 2012 1:13 am

Thanks, guys. I knew Cliff was right, but, I thought it wasn't explainned completely. I goofed, also.
You helped us both alot. Many thanks.
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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Guest on Fri Nov 09, 2012 7:50 am

Bill we all have a piece of the puzzle, together we make a great team! Very Happy

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by phone_man on Fri Nov 09, 2012 5:53 pm

I APPRECIATE YOU GUYS HELP. I TESTED IT BUT IT ONLY PRODUCED 60 V FOR A SECOND. I COULDN'T REPEAT IT, THOUGH

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by willy3486 on Fri Nov 09, 2012 7:00 pm

There are some diagrams on the web on how to build a solid state one. I have seen them but I don't remember where they are. A google search should turn them up if your game to build one.

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Resistance is Futile on Fri Nov 09, 2012 7:51 pm

Here's a good link for understanding vibrator details and complexities.

Click Here for A PDF
Click Here for an Exhaustive one from Mallory
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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Guest on Sat Nov 10, 2012 12:05 am

Those are great links Cliff! Thanks Smile

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by phone_man on Sat Nov 10, 2012 5:58 pm

Yes they are good links. Thanks again, Cliff. Very Happy

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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Resistance is Futile on Sat Nov 10, 2012 6:06 pm

The output voltage is either 6 volts or 12. I will have to research that aspect. The DC output is of course square wave and that is fed into the step-up transformer. It has a couple of spikes added because of induction in the transformer. So it has a rise time that isn't perfectly square, then you have the decay which also has a spike of high voltage on the end of the square wave. Then you have transformer reluctance that adds and subtracts from the square wave, plus the filtering and buffer caps. The step-up transformer can be anywhere from say 180 to well over 400 volts depending on design.
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Re: Old tube? HELP RSE NP-7V-12 168810

Post by Guest on Sun Nov 18, 2012 1:31 am

Here is a youtube link explaining how a vibrator works;
https://www.youtube.com/watch?v=Fp6PkRTmb8U

It's a little over 9 minutes long but I thought is was good.

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