VTTC 1 - Dual 811A

This was my very first documented VTTC.  It used a pair of 811A vacuum tubes purchased from RF Parts.  At the time I considered this coil to be a great success, but looking back I think even longer sparks were possible from the pair of tubes.  Never the less, I think it is a good design and is well suited for new-comers.  The maximum spark length was 7" from a guessed input power of 500W.  This was a very reliable setup and could run indefinitely without the tubes overheating.  The schematic below includes all the needed specs on this coil.