First light test and unfortunately under horrible conditions. We finished all the cabling and other small parts, bits and missing stuff in a days hectic work that lasted all night. So we missed the opportunity of testing in darkness.
There was no tuning performed, input was limited by a smaller 6A variac, it was broad day light, foggy and wet day, the coil was just pushed outside of the garage as no cables was long enough to get it away from the tree.
Sparks are about 60-70 cm and we killed the LED christmas light chain that was in the tree, it was unplugged before we started.
I found some old notes and a short video of a quick lash up vacuum tube tesla coil I made in a single day. I wrote the details down and drew a schematic for those interested in using small PL output tubes for similar VTTCs.
The latest update to the 100 Watt 6P45S tube amplifier is about a lot of testing and fault finding have gone into the tube amplifier to correct noise and hum issues. It is now in a state where the audio amplifier itself is as stable as it will get.
Further improvements lie solely on the power supply regarding more filtering capacitance, inrush current limitation and micro controller supervision and shutdown logic to protect valves and speakers.
Chapter 6 of the DRSSTC design guide is now online, the subject is on snubber capacitors, how to find the right capacitance based either on known inductance or a rule of thumb using primary peak current.
Chapter 4 of the DRSSTC design guide is now online, the subject is on DC bus capacitors with a primary focus on the regularly used aluminium electrolytic capacitors. A comparison with film capacitors is made and calculations to help you ensure your energy storage will hold up for your DRSSTC use.