16-09-2020, 06:20 PM
Hi.
Not so good progress today. I temporarily refilled the can with oil. On advancing the HT the can started to flash over at 22kv. This was a big disappointment as all was OK with just the new diodes. I removed it again and tried a dry run. The sparking was from the lower EHT connection and also from one end of a new cap. In fact it has to be due to routing of the caps which is due to the fact its impossible to get replacements the same as the originals. Available caps are just physically different.
So I tried as a bit of a laugh a thorn 1500 jelly pot to my surprise it works, no EHT regulation admittedly, even a 3000 EHT transformer works. With a multiplier it was easy to get 25kv. In fact it might be an idea to use the original transformer and an external multiplier.
https://youtu.be/U67QMpx6mLA
Not so good progress today. I temporarily refilled the can with oil. On advancing the HT the can started to flash over at 22kv. This was a big disappointment as all was OK with just the new diodes. I removed it again and tried a dry run. The sparking was from the lower EHT connection and also from one end of a new cap. In fact it has to be due to routing of the caps which is due to the fact its impossible to get replacements the same as the originals. Available caps are just physically different.
So I tried as a bit of a laugh a thorn 1500 jelly pot to my surprise it works, no EHT regulation admittedly, even a 3000 EHT transformer works. With a multiplier it was easy to get 25kv. In fact it might be an idea to use the original transformer and an external multiplier.
https://youtu.be/U67QMpx6mLA
