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Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello all, i have nearly finished my new single 811A VTTC. The details are as follows: Secondary-3.5in diameter/10in tall----30awg heavy build wire. Primary-16turns 18awg Feedback-16turns 18awg wire, all on a 4.5in form grid leak resistor-7kohm 25watt grid leak capacitor-10kv .001uF ceramic tank capacitor-10kv .0013uF ceramic MOT-2700volt Filament xfmr-12.6volt 4 amp(centertaped for 6.3volts)
Here are a few pics:This one full blast....About 4 inchers...
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Hehe, be careful running those tube over a dull orange glow, once they tun yellow they start to vaporise the plate You don't really notice it unitl it is almost gone, and you can see right through it (don't ask how I know this )
Looking good, a few suggestions...
The choke on the anode... Move it further from the tube, those things emit soo much ir heat it is not even funny. I managed to melt polycarbonate about 2" from the tube
Also, 7k sounds a little big for the grid leak... Could you try a slightly smaller oe and see how it affects spark length?
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Yea, i dont leave the tube powered like that for more than a few seconds...Wattmeter showed over 600watts!!!Yow!Beefy tube...
That resistor is the only value of its kind that i have like that...I did briefly hold another in parallel with it, sparks didnt do much better, the tube just got hotter:-P
A few things to do-Build a base for the secondary/primary to sit on over the circuit(typical tesla coil style enclosure) Change the tank cap to a doorknob, as im told this type is more for bypass(although it doesnt heat at all, even at full blast!)Totally redo the primary/feedback windings...Right now, this is a lashup to test the circuit. And oh yea, a staccato circuit to allow full voltage in, and to save that tube! I was concerned about the filter resistor/inductor as well, but it seems to do fine, i may move it above the tube though if it begins to heat up significantly.
Wondering if that tube is still kicking? I have seen tubes glow like that but only once!
If you havn't done a toroid yet you might consider my el-cheapo hardware store topload. Get 4 PVC elbows that give you tyhe correct Major OD, put them together, tape a piece of plastic across the top, then tape the rest of the toroid with aluminum tape.
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New 811A VTTC
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