If you have the book Electronic Counting Circuits by Dance, a lot of his trigger tube counter circuits use Z700 U tubes. These are 4 lead trigger tubes with the primer electrode for consistant firing even in darkness. So if you want to build a trigger tube clock this may help. I have found a source for these on E-bay his E-bay ID is supra_buyer. I have no relationship with this seller. I purchased 6M-E5 miniature Eye tubes from him in the past, the deal for the Z700 Us is my second transaction. I purchased the Z-700U tubes in a buy it now sale E-bay # 280619094369. The sale was for 10 tubes for $5.00 Plus the cost of shipping. I purchased a fairly large quantity of Z700 U tubes from him directly. He said that he has more of these tubes. I told him that I would let the group know about them. If anybody is interested they can contact him directly about these tubes. Again I have no relationship with this seller other than as a buyer. From my transactions I would say he has been honest with me.
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