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Old 25th April 2009, 08:24 PM   #11
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To me its a toss up between this 150T from my Dad's transmitter or the blue Arcturus tubes....

Dave
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Old 25th April 2009, 10:07 PM   #12
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The 205d is another favorite of mine...

http://www.the-planet.org/nnetg/bugle205d_3.jpg
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Old 25th April 2009, 11:17 PM   #13
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Boring, I know, but I think one of the best looking reasonably-sized output tubes is the KT66. Also, 807 and 1625. Especially when blue glow is factored in.
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Old 26th April 2009, 12:14 AM   #14
rdf is offline rdf  Canada
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For me it's the 828 & 814. A pair lights the room.
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Old 26th April 2009, 12:52 AM   #15
pointy is offline pointy  United Kingdom
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hope the link works

<http://www.youtube.com/watch?v=ledGM...e=channel_page>
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Old 26th April 2009, 01:23 AM   #16
nhuwar is offline nhuwar  United States
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Ok Here's some I like.
http://i301.photobucket.com/albums/n.../Photo0085.jpg

The order is 6sn7gt, 4-400a, 6c21, 4-1000a, 849


In my opinion the 6c21 is the prettiest I have seen. It's basically a 450th but pulse rated and the mu is a little lower.

I put the 6sn7 for scale. The 849 is a nice one too. The one I have has seen many hours as you can see. I got it for show.


There is one other that I don't have and probably never will and thats a 8d21. It was one of rca original tubes for vhf tv it's a dual tetrode and it just looks really cool.

One day I still might make an amp with the 2 6c21's I have but thats a long way down the road.

Oh sorry for the low quality pic I took it with my cell phone.

And just in case some one doesn't know how big a 6sn7 is the 6c21 is 12 inches tall.

The 849 is a beast.

Nick
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Old 26th April 2009, 02:45 AM   #17
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I like the 8078 triode with it's square carbon plate. The 7092 is very similar and a tiny bit bigger. However from a more useful standpoint, I think the TJ mesh plate globe 300B is very cool looking.
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File Type: jpg 8078.jpg (38.7 KB, 932 views)
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Old 26th April 2009, 02:57 AM   #18
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Quote:
Originally posted by HollowState
I like the 8078 triode with it's square carbon plate. The 7092 is very similar and a tiny bit bigger.

A pair of those ought to make a good headphone amp!
Forget B+, just use the grid to modulate the space charge boiling off the cathode.

Actually you couldn't find a better triode for a tabletop tube tesla coil.
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Old 26th April 2009, 03:11 AM   #19
nhuwar is offline nhuwar  United States
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Quote:
Originally posted by rcavictim



A pair of those ought to make a good headphone amp!
Forget B+, just use the grid to modulate the space charge boiling off the cathode.

Actually you couldn't find a better triode for a tabletop tube tesla coil.

Thats my next project for some plasma tweeters LOL,,,,, Really it is.



What's the dissipation on the 8078? It looks like something used for induction heating rf sources.

Nick
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Old 26th April 2009, 03:32 AM   #20
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Quote:
Originally posted by rcavictim
Actually you couldn't find a better triode for a tabletop tube tesla coil.
Ah yes, I've build my share of those. But with 304TLs amd 6C21s. I didn't have this 1000T back when I was into them.

Nick, as far as the dissipation on the 8078, I'm not sure, but I would guess 1000 watts, maybe more. Induction heating...probably so. I have a life long collection of monster tubes.

Edit: I just found out that an 8078 is also called a TB4/1500. So I guess the plate dissipation is 1500 watts.
http://www.tubes.it/amperex_rf_eng.htm
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