On 2020-02-15 10:39 AM, David Speck MD wrote: > Thanks to all the respondents about the monoscope tubes. > > We had some pretty smart predecessors. > > Dave > > On 2/14/2020 11:23 PM, Instrument Resources of America wrote: >> The original monoscope tube dates back to the 1930's when RCA first >> made its 1898 a 3" diameter electrostatic deflected tube, looking much >> like any other 3" inch CRT. Except for the pin in the center of the >> screen. It produced a video signal of a 'girls head' when its internal >> target plate was scanned. Then came the 1899 a 5" diameter >> magnetically deflected tube which produced the 'Indian head' test >> pattern that many television stations would broadcast when they ceased
One of these tubes was recently sold on ebay. And a Soviet test pattern tube is currently for sale: https://www.ebay.ca/itm/RARE-soviet-SSSR-cccp-IMAGE-ORTHICON-MONOSCOPE-tube-supericonoscope-iconoscope/223461286120 >> their regular programming for the day, usually around one, or two A.M. >> I myself, as I'm sure there must be others here as well, are old >> enough to remember seeing this Indian head test pattern being >> broadcast late at night. ... Ira. >> >> >> On 2/14/2020 3:54 PM, Mac Doktor wrote: >>>> On Feb 14, 2020, at 2:11 PM, Toby Thain <[email protected]> >>>> wrote: >>>> >>>> Thanks very much for the suggestion! Even the glass etching ability >>>> sounds quite useful for other purposes. (Tangent: I wonder if that >>>> could >>>> be used for edgelit projects...) >>> Also a very effective way to give an expensive brass model locomotive >>> enough "tooth" on the surface for the paint to stick permanently. >>> Pickling is always a fall-back. >>> >>> >>>>> By the way, what is a "Monoscope"? I've never heard the term before. >>>> Here's the brochure: >>>> >>>> >>>> http://www.frank.mif.pg.gda.pl/other/Raytheon/Raytheon_symbolray_an.pdf >>>> >>>> And @TubeTimeUS got one working: >>>> >>>> http://tubetime.us/index.php/2018/06/04/a-vacuum-tube-rom/ >>> I have a couple of these. $15 apiece at a hamfest. I had no idea what >>> they were but they were too cool to pass up. It took me several >>> minutes to figure out what they were after I got home. I finally >>> looked in at just the right angle and as soon as I saw some letters >>> the lights came on. >>> >>> I think both have leaked, unfortunately. Really did have me going for >>> about five minutes. >>> >>> >>> Terry Bowman, KA4HJH >>> "The Mac Doctor" >> > -- > You received this message because you are subscribed to the Google > Groups "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/58e06467-dd28-6611-859f-dfcbc50d499c%40davidspeckmd.org > <https://groups.google.com/d/msgid/neonixie-l/58e06467-dd28-6611-859f-dfcbc50d499c%40davidspeckmd.org?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/1a49d29c-a15f-9b0e-f669-7178cd365a6e%40telegraphics.com.au.
