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Registered Member #1879
Joined: Mon Dec 22 2008, 04:11AM
Location:
Posts: 40
I have a guy at work that keeps a brand new Amperex 5867 (or 5868, did not write it down...I will check next time I walk by his lab.) in his window as decoration. It has a mu of only 25 or so so it is not a good HF amplifier tube. It is a very good looking tube with a massive graphite anode.
Can it make a decent tesla coil? Most of the VTTC's I seen uses high gain tubes.
He promised that I could have it if I use it for a cool purpose.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Whichever of the two part numbers it is, both are specified as suitable for use as oscillators, which is what you are looking for!
Here are the data sheets for the Philips equivalents:
5867
5868
If you are concerned about the amplification factor, then I should simply increase the amount of feedback, by, for example, adding some extra turns to your feedback winding, but I can't see this as being a problem.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
This would make a very nice VTTC, i think. I would use a doubler for tubes with 3kv rating, but that is up to you, of course. It is doubtful that a 1kv increase in voltage would cause an arcover, but it will heat more. This however should not be too much of a problem, as when tuned correctly heating is minimized.
If it is not getting the needed feedback, mess with the grid leak resistor/capacitor and increase tickler coil turns (feedback). i would use the basic 833A/833C/811A vttc circuit, they are each pretty much the same and work well. I have even used that circuit with success with small TV sweep pentodes.
And a graphite anode would increase max dissipation, so you could run it harder without too much heating. This must be one nice fellow to let this go for free!
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Amperex 5867 any good for VTTC (mu only 25)
