Post Your Cool Pic Here! / General Chatting / Forums

Forums

4hv.org :: Forums :: General Chatting

« Previous topic | Next topic »

Post Your Cool Pic Here!

first previous 26 27 28 29 next last

Move Thread

LAN_403

Hazmatt_(The Underdog)

Sun Sept 10 2006, 02:32AM

Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735

that cap has suffered damage!

Alex

Sun Sept 10 2006, 03:15AM

Geometrically Frustrated
Registered Member #6 Joined: Thu Feb 02 2006, 04:18AM
Location: Bowdoin, Maine
Posts: 373

Nice collection of books (oh, and nice cap too).

Chris Russell

Sun Sept 10 2006, 04:24PM

... not Russel!
Registered Member #1 Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052

Hazmatt_(The Underdog) wrote ...

that cap has suffered damage!

No, if you look around, they all look like that, at least from this manufacturer. At the final stage of manufacture, they burn off any remaining air in the tube. It ruins the nice copper gleam around the inner electrode, but it still works perfectly. That's why most pics of this tube are taken with the inner electrode fully extended; it's prettier that way.

Here's a closeup, just for fun:

The Wumpus

Sun Sept 10 2006, 11:28PM

Registered Member #325 Joined: Fri Mar 17 2006, 12:42AM
Location: Turku, Finland
Posts: 55

Playing around with a stogie and a 100mW green laser (can you see the green dragon?

) :

Hazmatt_(The Underdog)

Mon Sept 11 2006, 01:10AM

Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735

No Chris. I know a guy at the TRW swapmeet that sells Vac. Caps and they do not all look like that. We even talked about this. That cap has suffered some serious arc over flashing.

They do not burn off the air either. They use a Gettering mixture of metals to absorb trace gasses in the envelope. The gettering material is usually Barium and Calcuim metals, sometimes Magnesium to remove Oxygen specifically.

But they do not all look like that.

Chris Russell

Mon Sept 11 2006, 03:06AM

... not Russel!
Registered Member #1 Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052

This particular manufacturer doesn't use getters, they burn off the last of the air by intentionally inducing breakdown at low power. Every other tube of this rating (or similar ratings) that I've seen from this manufacturer bears the same markings. These tubes were originally built for use in Soviet Army radio gear... they aren't always pretty, but they work and work well.

For what it's worth, I have never seen a Jennings with similar markings, so I can see why one would be concerned. It does look like damage at first glance. A careful inspection reveals that they are surface blemishes on the copper only, and that there's no damage to the metal underneath whatsoever. I've also personally tested it to 8.5kV (highest I can generate at the moment).

SpyrosF

Tue Sept 12 2006, 03:46PM

Registered Member #352 Joined: Tue Mar 28 2006, 08:39AM
Location: Greece
Posts: 14

TEA laser channel glow discharge. Electrodes gap is ~2mm . Air is used as laser gas
Picture is unmodified (only cropped)

Tesladownunder

Sun Sept 24 2006, 01:49AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

[quote]
[quote]
[quote]

[/quote]

Oh he is cute.. I want one for a pet
[/quote1157845753]
That looks like a bot fly...UGGG...Dont want that for a pet!
Matt
[/quote1159062090]

It's a cicada. Some of the Australian cicadas can be a couple of inches long and bright green, orange or purple. They make very loud chirping sounds in the daytime in summer and are very much a part of the Australian "bush" experience. They are mostly harmless and only take small children.

Now for one of mine. Have you ever seen a better UFO photo? This is just rotated and cropped and was taken with a flash but not altered otherwise. Fired from my latest vortex ring generator.

Peter

1159062575 10 FT6000 Vortexphysicsskyufo

Marko

Sun Sept 24 2006, 12:35PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

It's a cicada. Some of the Australian cicadas can be a couple of inches long and bright green, orange or purple. They make very loud chirping sounds in the daytime in summer and are very much a part of the Australian "bush" experience. They are mostly harmless and only take small children.

One on nik's hand is exactly the same from wikipedia.
Ours aren't as close as docile and you can catch them only by suprise

.
Also have wierd big eyes and funny fins on head, but differ in color and are a bit bigger.

Simon

Mon Sept 25 2006, 12:25AM

Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549

Tesladownunder wrote ...

Now for one of mine. Have you ever seen a better UFO photo? This is just rotated and cropped and was taken with a flash but not altered otherwise. Fired from my latest vortex ring generator.

Brilliant! Especially considering how far this chicken feeder got.

first previous 26 27 28 29 next last

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob