Hi, I took out one tube from the lot and tested it as follows:
HV supply : 230VAC-to-110VAC transformer -> full wave rectifier (using 1n4007) =>> When i measured using multimeter, it read approx 110V dc (i believe that this is average value; peak voltage in rectified output is 155vdc.) I used circuit shown in "Figure C. Single transistor current sink" in the following document: http://www.die-wuestens.de/iz/IN9-2.pdf (Thanks to the author of the document) Vin input to base of MJE340 is made variable (0V to 5V) using potentimeter -> power supply for this is a nice regulated DC. Emitter resistance I used was 330ohms. After power ON of the setup and Vin is set to 5V, then only 50% of the tube length was glowing. I followed an advice from one of the member regarding intermittently making it glow using double the current. So, i reduced emitter resistance to 150ohms approx and the length of glow became 75% of tube length ! I changed back emitter resistance to 330ohms and now the glow length is 75%. The following picture shows the glow in the tube when Vin was 5V approx.: http://www.flickr.com/photos/svkr2k/8555114044/in/photostream/lightbox/ >From other posts, I followed these two steps: 1. Not using filter capacitor for smoothing High voltage DC 2. Intermittently operate the tube with double the current Should I really perform Step #2 for several hours till the glow reaches 100% length? Please advice. I shalll perform any experiment any one suggests. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/L5t1l-hriL4J. For more options, visit https://groups.google.com/groups/opt_out.
