Hi guys, Since Friedhelm build his Nixie clock with tube electronics in 2005: https://www.jogis-roehrenbude.de/Leserbriefe/Bruegmann-Digital-Roehren-Cloc… I'm more or less trying to build a "tube" Nixie clock with neon lamps and/or trigger tubes/thyratrons instead of vacuum triodes. In 2005 I told Friedhelm that this is a nice clock..but build the wrong way. To tube times one build dividers using monoflops and ring counters with decatrons and so on..not with vacuum tube Flipflops. We've calculated the energy costs for this tube clock of approx. 400 Deutschmarks in 2005, don't really want todo this today..especially for the country with the dumbest and worst energy politics world wide.. green ideology politicans here has blown up the worlds best and safest nuclear power plants to dust... ... Since I've got approx 1000 of small chinese neon bulbs in the meantime, I've tried to build Ring counters out of the neon lamps..it works, but not that good, since the differnece between the Ignition voltage and the Extinguishing voltage is to small on this tubes, the counters are unreliable. A few years ago some russian trigger tubes TX4b got available, that are small pencil tubes with only 3,5mA Ia max. Those tubes have a bad reputation in rossia because they where put in to the vertical deflection circuit of some soviet made black and white TV sets and it was a bad design, the tubes where overloaded and don't lasted for very long. Another type, the MTX-90 was more often suggested and used. After some years the box with the TX4b fell into my hands and I'm searches again in the russian Internet for possible uses of the TX4b in Ring counters..the circuit design depends on the parameters of the tubes and isn't really that simple. I've searched for examples and finally found some morse transmitter device with "digital electronics" build out of the TX4b tubes.. russians wrote that this thing was unreliable :-) Nevertheless I found what I'm searching for, an schematic and a description in russian, english and french. ..so I have an working ring counter here next to me on a breadboard. :-) There is still an MPSA42 used as an pulse former in the clock circuit that I want to change agains a trigger tube. I need an Ide of an circuit that gets triggered on approx. 30-40V and outputs an rectangle pulse of lets say 60V and 10-30µs duration to properly trigger the ring counter, using possibly only one trigger tube. I think no one knows that for now..but I'm very grateful for links to older literature on this topic. approximately in 2000 I'm parted out old hp tube counters, the displays where "thermometer Displays using 10 pcs. of neon lamps, one for each number. The counters used 4 12at7 type "digital" tubes (don't remember the exact type for now) with biquinary output to the neon lamps. Later hp counter modules used the very same schematics and the neons and one hybrid photoresistor module in front of the neons as decoder to drive nixie tubes. I've tried it already in the past with the neon bulb ring counters.. a cheap photoresistor in a balc schrink tube that was put onto the neon lamp can switch a nixie..it works flawlessly. Tried this on the TX4b .. works too. :-) ..other schematics ad an additional trogger tube for each nixie cathode..the effort pretty much explodes... Hope someone can help with some hints or links. Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 info(a)tsht.de Tel +49 37292 709778 Mobil: 0172 8790 741