07-10-2017, 08:26 AM
Hi.
I got very good results yesterday with the Thorn 900 Lopt. At this point I'm running the time base at 90 volts HT, I'm using three 10kv rated silicon diodes in series with the one nearest the Lopt shunted with a 50Pf pulse capacitor. I have this decoupled with a rather too large a value 0.1uf cap rated at 6kv temporarily, this then feeds via a 1.5 meg to the final anode of the tube.
Picture quality is very good line linearity is near perfect bar some left hand foldover. Hopefully over the weekend I'll introduce stabilisation to the circuit and raise the HT, I may need to reduce the line drive somewhat, doing this removes the foldover on the left hand side. I took some quick photos last evening and will post them up later on.
I got very good results yesterday with the Thorn 900 Lopt. At this point I'm running the time base at 90 volts HT, I'm using three 10kv rated silicon diodes in series with the one nearest the Lopt shunted with a 50Pf pulse capacitor. I have this decoupled with a rather too large a value 0.1uf cap rated at 6kv temporarily, this then feeds via a 1.5 meg to the final anode of the tube.
Picture quality is very good line linearity is near perfect bar some left hand foldover. Hopefully over the weekend I'll introduce stabilisation to the circuit and raise the HT, I may need to reduce the line drive somewhat, doing this removes the foldover on the left hand side. I took some quick photos last evening and will post them up later on.
