Here is the 5th vacuum tube tesla coil I have built. Its the latest of those seen on my website. It uses a single 810 tube (2500V). The circuit is very similar to that of the 304TL VTTC (see the 304 page for the coil specs, its the same aside from a lower grid leak resistor value of 3k). With the voltage doubler it makes awesome 16" sparks. This coil is complete. What I mean is that, the variac and staccato controller are built into the small 11x12" base! Its a very classy coil if I do say so myself. The base is made from solid oak. Enjoy the pictures! Specs below:
| Secondary Coil | 3.5" PVC wound to a length of 11.5" of 26awg magnet wire. |
| Toroid | 7"x1.5" |
| Primary Coil | 36 turns of 14awg stranded THHN on a 6.5" PVC form. |
| Tank Capacitor | 2 series 2nF 40kv doorknob caps made by TDK. (TDK-UHV series) |
| Feedback Coil | 20 turns of 26awg magnet wire wound on the same 6.5" PVC form as the primary, .75" above. |
| Plate Supply | Small MOT (1900V) with a voltage doubler using the microwave oven diode with 2 parallel microwave oven capacitors (~2uF). |
| Staccato Controller | See Staccato page. |
| Grid Leak Capacitor | 2nf 10kv ceramic disk capacitor |
| Grid Leak Resistor | 3k ohms at 100W. |
Pictures
