Thank you Jon D. and Marcin for your input on the OTK markings. It turns out that mine once had marking which have been rubbed off due to much handling. My A-201's looks like they have been used since they have bent pins and almost no OTK markings left, I could just see some traces of markings when I looked under a bright light. Today I spent some time to modify the circuit according to a design shown in the article "A new poly-anode counting tube, the ‘Polyatron’" by Y. Hatta ; H. Mase ; M. Sugawara published in Radio and Electronic Engineer, Volume 26, issue5, November 1963, p. 383 – 388 - however it does not give me the operating conditions that I am looking for so the experiments will have to continue. With this driving mode both guide electrodes, G1 & G2, flash for every step - since there is little or no information on these Polyatrons I can't say if that is the correct behaviour or not - at least the voltages on all electrodes looks better in this mode. I just posted to new short films on YouTube showing this new look, one slow and one fast counting sequence: http://www.youtube.com/watch?v=At6Iq_reUSQ & http://www.youtube.com/watch?v=A41YBbGdeI0 /Martin
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