Wanted, to Buy or Trade:
(Sorry if this isn't quite on-topic. There don't seem to be any newsgroups exactly fitting this subject.)
Large-digit "Nixie" type neon numeric digital display tubes, especially those with digits over 1 inch (25mm) tall. Also, sockets for same.
Most wanted: Burroughs type B-7031 or B-7032 "Jumbo" size - 2 inch (50mm) tall digits in a tube 5.5 inches (140mm) tall by 2.25 inches (57mm) diameter at the base. And the large 14-pin sockets which fit them, type SK-117 or equivalent, having a pin circle diameter of 1.75 inches (45mm).
Actually, I have 5 of the very rare B-7032's, which are the inverted display configuration variation of the B-7031 (pins on top pointing UP when digits are upright). Mine are slightly to moderately darkened; however, due to anode location in these tubes, the darkening is mainly on the sides of the glass and does not significantly affect digit appearance when viewed from the front. All have been tested and function perfectly when driven in the 10-16mA range per preliminary B-7031 data which can be seen here: http://www.wps.com/archives/tube-datasheets/Datasheets/Burroughs-catalog-918A/index.html Will consider trading my B-7032's if I can get more and/or better condition B-7031's in the deal.
I also have available to trade, "Super" size Nixies of types B-6091 / NL-8423 (a.k.a. NL-5423, and interchangable with earlier types B-7153, B-6033, and BD-206). These have digits .808 inch (20mm) tall, in end-viewed configuration. In addition, I have Philips (Mullard) type ZM1040 which have digits 30mm (1.18 inches) tall and a red filter coating on the glass. I have sockets which fit both of these tube types, equivalent to HSK-112, HSK-106, B13B, and VH13/131.
Does anyone in southern California happen to have any of the HUMONGOUS Nixies with ***6 INCH TALL DIGITS***, type CD47/GR414 Rodan Indicator Tube by Okaya Electric Industries Co. Ltd. of Japan? Picture here: http://www.netcomuk.co.uk/~wwl/count.html Even if you're not willing to part with one, I'd love to just see one in operation. I can even build and bring a breadboard driver circuit if you don't have one.
Replies by e-mail please. See below for a clue to repair my e-mail address.
Alan "A.J." Franzman
My real e-mail address does not compute.