Alright, thanks for the tips. I’ll see what I can do. Not doubling the current on other tubes should be obvious, if anything ill modify the circuit on those to run on like 60% current or something, don’t want those to wear out after all. How long would I double the current on the affected tubes? I’m guessing until it lights up entirely, but what if it doesn’t? I don’t want to risk damaging any tubes further unless I have access to a replacement. Interesting regarding the yield, where did you find that info? Paul Andrews schrieb am Montag, 13. November 2023 um 22:55:13 UTC+1:
> Because all the segments are in the same plane, it is possible that they > could all get deposits equally, so increasing the current may work. Yes, > the current is controlled by a resistor. The documentation I linked you to > gives the recommended current for each segment. To try to re-condition the > segments I would double the current, but I would only do that with the > affected tubes. > > These tubes are known for having a low yield so it is possible that the > affected tubes have other problems, such as outgassing. I would be very > careful when removing them from any socket they may be in to avoid breaking > a seal between the pin and the tube. > > On Monday, November 13, 2023 at 4:22:00 PM UTC-5 Magnedyne wrote: > >> >> Furthermore I should mention that the partial glow does not affect only >> specific elements of the tube but any element inside the tube. >> Can this be caused by deposits? >> Nicholas Stock schrieb am Montag, 13. November 2023 um 21:56:10 UTC+1: >> >>> WHAT A FIND!!! OMG. I didn't even know there were smaller versions of >>> the ZM1350 (shame on me!). >>> >>> The tubes with the partially lit segments can probably be revived with a >>> little extra current... just be careful not to burn them during the healing >>> process (if it works..). >>> >>> Wow.. >>> >>> Welcome to the group, >>> >>> Nick >>> >>> On Mon, Nov 13, 2023 at 12:07 PM Magnedyne <[email protected]> >>> wrote: >>> >>>> Well, this serves as my introduction and and as a thread about a >>>> beautiful sign I just picked up. >>>> Firstly something about myself. >>>> I’m a 17 year old collector and (hobby) historian of vintage computers, >>>> my interests are mainly minis, mainframes, early micros and kit/diy >>>> computers. But I’ve got a few other different bits and bobs throughout the >>>> history of technology as well. >>>> Now back to the reason I joined this group. >>>> I came across an absolutely beautiful Telefunken advertising sign for >>>> the, frankly underdocumented, Telefunken Varisymbol tubes. They were >>>> Telefunkens response to the Burroughs 7971 alphanumerical tubes. These >>>> were >>>> only sold for a very brief amount of time and exclusively in Europe. >>>> Interestingly these are flat like panaplex tubes and the anode is not a >>>> grid, but a coating on the inside of the tube. These are the earliest gas >>>> discharge tubes, well the ones I’m aware of anyhow, which used such a >>>> coating. >>>> The sign is a handmade one off which was lugged around to fairs to >>>> advertise the Varisymbol to potential Customers. It implements all three >>>> sizes of the Varisymbol ZM1350 ZM1360 & ZM1370. It can alternate between >>>> „TELEFUNKEN“ and „VARISYMBOL“ at four different speeds. Switching between >>>> the sign reading „TELEFUNKEN“ three times, then „VARISYMBOL“ three times >>>> and the sign reading „TELEFUNKEN VARISYMBOL TELEFUNKEN“/ „VARISYMBOL >>>> TELEFUNKEN VARISYMBOL“ is possible as well. Unfortunately three tubes >>>> don’t display quite properly. I’m hoping it’s just the electronics, I >>>> haven’t had time for a detailed diagnosis yet. Even if it’s the tubes, it >>>> seems to be the most common type at least, the ZM1350 which seems to have >>>> popped up most often in the past. >>>> Any further info about the Varisymbol is greatly appreciated. >>>> Cheers, >>>> Magnedyne >>>> [image: IMG_0026.jpeg] >>>> >>>> [image: IMG_0025.jpeg] >>>> [image: IMG_0021.jpeg] >>>> >>>> >>>> >>>> -- >>>> 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/20e32d2c-3ac1-4656-b532-77b22f6a35f1n%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/neonixie-l/20e32d2c-3ac1-4656-b532-77b22f6a35f1n%40googlegroups.com?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/8036e792-d1e0-4d91-af8f-0b7bad46eb15n%40googlegroups.com.
