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Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
Hey ,
Wanted to post my progress on my 811a VTTC ,
Just got around to making a interrupter that is synced to the 50 hz mains :)
50 Hz @ 9 Volts is rectified to 100 Hz , then a transistor pair is used to produce a 100 Hz square wave that is then fed into a 4017 , the output from the 4017 is 10% duty cycle at 10 hz this is used to drive a 600 volt triac in the cathode of the 811a .
Primary - 32 turns Tank - 750 pF ( 2 1.5nF caps in series ) Secondary - 2" x 2.5" Feedback - 12 Turns Feedback resistor - 25W lamp Supply - level shifted Mot , 4uF of capacitor on shifter .
The output I got was 9" Arcs from the secondary at 10 hz rep rate .
I have made a new secondary that is 2.5" x 5.5" with around 4 ish " of windings .
Tank Cap is 1.5 nF , Primary 3" with 30 turns , 14 Feedback , rest remains the same values . Running at 10 Hz rep I get 10" arcs , but I think I could get abit more from it but im at the limits of the 811a now as with the new secondary it getting very red so I plan to tune more then move to a 572B tube instead .
Im not sure if I should mess with the feedback setup as im getting good output but think I could get more hopefully
Registered Member #4104
Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
teravolt wrote ...
Is this your 811
That's a 100 W tungsten lamp that's been used as a grid leak resistor , in the 3rd picture in the 1st post you can see the 811a tube laying on its side in the bottom left hand corner just in front of the MOT .
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Mini 811a VTTC , Mians Sycned Interrupted
