Hello everyone. Since becoming an addict about two years ago I have built many kits and have now started down the road of building my own clock - albeit a very simple one. My query centres around the use of 74141's (or the Russian version) as direct drivers for tubes. >From what I have tried so far they seem to work well for all small tubes as well as Z566M, IN-18's and Dalibors tubes. I know that the issue of the Blue Spot on IN-18's when driven from 74141's has been the subject of much discussion here. I have a box of IN-18's and I know that at least one of them showed some good looking blue spot(s) when initially tested. I looked in to using an HV5182 in place of the 74141 and that worked well with all tubes though the IN-18 that had the blue spot before, still had the blue spot. I had Vpp on the HV5812 set to about 76V. I now learn that that HV5812 as an issue sinking much over 3.5mA when connected to the cathode of a digit when the Anode is connected to 170v via a suitable series resistor. Can anyone advise as to whether I am backing the wrong horse by looking at the HV5812 and whether or not i need to move to another driver such as the HV5622 which I note is used in a lot of designs that drive IN-18's? For this project I only need to drive two tubes so the HV5812 is ideal in that respect. I am aware of various solutions involving the use of transistors for switching but would like (if possible) to keep the project as simple as possible. The HV5812 is available in a DIL package which I like, I believe that the HV5622 is only in available in the 44 pin square package (SMD or socket). All pointers gleefully received!
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