Fun with 770V

[Tech_Junkie]

TJ; Do you have any idea what kind of capacitance it has? And, what kind of vacuum tubes do you have? I have a small collection of my own going on; I plan on building an amplifier eventually.

All types of tubes. I dont know enough about tubes to quote some types, but its a vast assortment.

Pix of the cap.

These are the only markings on it.

 

[GBD]

Looks like 4MFD written on it, so probably 4uF @ 4KV (32 joules of pulse power to play with)
its made by general electric, and the very buttom is a P/N or model I suppose.

 

[Fiddy]

my bad forgot the micro part

 

[GBD]

No, 32KJ (32,000J) would be about 70 of my capacitors together.

Electronics 2000 | Capacitor Charge / Energy Calculator

W = ½ QV = ½ CV2

There is no chance in hell that cap is 4 millifarads (4000uF), so the MFD abbrevaition must be for microfarads. (4uF)

 

[Tech_Junkie]

How can I charge the cap? And how do I know when its full?

 

[Sigurthr]

You charge it by applying DC voltage to it, you know it's full when the voltage across it is ~90% the rated voltage. Be sure to not reverse the polarity; DC+ goes to +, ground to -.

 

[Tech_Junkie]

Here is most of my tube collection.

Sorry for the thread jack.

 

[GBD]

Thread jack?!
Moar tube porn plz....

 

[Tech_Junkie]

LOL, the other box is in storage.

 

[Hiemal]

That one big exposed tube looks sorta like a Thyratron or a Mercury vapor rectifier.... (in your second picture, the one near the bottom right corner of the blue box) It might just be a radio frequency tube though. What's the part number on it?

You can use those to make some pretty neat things. I love vacuum tubes mainly because 1. They look so much cooler than semiconductors, and 2. They're a lot more rugged, because you can push them a lot harder and not end up with a blown tube.

I'd love to get some of those tubes off of you TJ. Is there something else I could possibly build for you to get some?

And, I'll post some pictures of my tube collection when I get back home guise.

 

[Tech_Junkie]

Can you build me a woman that does not talk, and will gobble my baloney on command? You can have all my tubes.

There are two of those tubes, and they are the pride of my collection. I also have a tube shaped like a flying saucer.

Found a pic of some of my other tubes in this thread. Scroll down to post 9.

http://laserpointerforums.com/f57/flea-markets-finds-50468.html

 

[Hiemal]

Ah, those big tubes are Xenon filled rectifiers... the pancakey acorn one I can't tell, as the part number for it isn't clear.

Also, I love your word choice. xD

Edit;;

Toobs

http://i.imgur.com/CMaMW.jpg

 

[Tech_Junkie]

Ah, those big tubes are Xenon filled rectifiers...

Is that good, bad, or ordinary?

My toob is bugger than yours. :na:

 

[Hiemal]

Well, here's the datasheet and decide for yourself!

http://tubedata.tubes.se/sheets/049/3/3B28.pdf

It can handle a max of 5000 - 10,000 volts, and rectify 0.5 amps or 1 amp max... (depends on the filament voltage)

They're pretty damn good tubes, actually!

And meh, your tubes aren't useful for much. My 811A can actually amplify unlike your gridless tubes.

 

[Tech_Junkie]

I bought them to do art, so naaah.

Can I light filament up with low voltage like the others.

 

[Hiemal]

Of course you can. The filaments are basically like lightbulb ones except made with even better materials....so they'll last even longer than standard lightbulbs!

How much light that'll actually come out will vary based off of tube construction though. A 811A when full filament current is flowing is very bright.