Ahh, my mistake - the filiment pins 14 and 1 are next to each other - the other diagram above showed a gap between 14 and 1. The pin numbers are nicely moulded in the base if you remove the socket.[image: Tube End.PNG] The tube has pins 6 and 13 absent from the tube, and the wired-up socket doesn't use pins 4 or 12 either.
I'd taken the gap (pins 12 and 13) as the gap on the diagram above. Interestingly I have pin 4 present on the socket but not wired up - someone must have changed their mind assembling it. On Sunday, 16 May 2021 at 21:24:47 UTC+1 John Snow wrote: > When you get your kit can I check the socket wiring with you? Mine doesn't > match the wiring for the 8SJ31J in the seller's datasheet, but is > pre-soldered & heatshunk and already on the tube. I'm worried they made an > off-by-one error wiring it up. > > On Saturday, 15 May 2021 at 05:53:11 UTC+1 gregebert wrote: > >> Most likely, the error is in the text description in the instruction >> manual. From the datasheet, pin 9 is the multi-anode connection, and pin 5 >> is the single anode. I am more likely to follow the connections to specific >> pin numbers in the instructions, rather than the text-description. Pin 9 is >> the higher-voltage (1500V) anode, and it should not be difficult to verify >> that in the schematic. >> >> As far as the power is concerned, I cant figure out where 7-10 watts is >> going. The filament is 6.3V / 150mA so that's less than 1 watt. The >> electron-beam current is probably less than 100uA, so that is also less >> than 1 watt. For comparison, a NIMO tube uses 30uA. Even if the anode >> current was a whopping 1mA, that would still be only 1.5 watts. So that >> leaves the grid and focus anode as the only other source of power >> dissipation; maybe some clues will be in the schematic. >> >> My kit arrived in the US earlier this week, so I hope it will get >> delivered to me next week. I will be placing a 250mA fuse in series with >> the filament for added protection. I'll post an update after I've either >> finished it, or ran into a problem. >> >> On Friday, May 14, 2021 at 5:15:45 PM UTC-7 John Snow wrote: >> >>> Found a conflict between the documentation (both before and after google >>> auto-translation). The conflict is between Anodes A1,A2,A3 in the sellers >>> documentation. >>> >>> The seller's documentation lists: >>> >>> A2 (Focusing Anode) - pin 5 >>> A1,A3 (first and third anodes) - pin 9 >>> >>> I've found a separate pinout for the 8SJ31J tube that lists: >>> >>> Focusing Anode,A2 - pin 9 >>> A1 - pin 5 >>> >>> The second pinout is from >>> http://www.spectrum-scientifics.com/v/vspfiles/pdf/Properties_of_Electrons_Apparatus.pdf >>> >>> >>> It looks like the tube in the spectrum-scientifics is the thin-pin >>> version of the 8SJ31J, and the kit uses the thick-pin version of the >>> 8SJ31J, but I'd like a second opinion. >>> >>> I know they have different power requirements - the thick-pin (old) is >>> around 10W, and the thin-pin (new) is around 7W (I'm assuming which are old >>> and new based on the design of the base socket). The rest of the pinout >>> agrees, is this another difference between the old and new designs of >>> tubes? >>> >>> Tl;DR I'm not clear on the anodes of the 8SJ31J, which pin is the >>> focusing anode, and why the other two of the three anodes are joined >>> together. >>> On Saturday, 15 May 2021 at 00:06:33 UTC+1 John Snow wrote: >>> >>>> I'm trying to figure out how it's put together before I start soldering. >>>> >>>> As Paolo mentioned the only mystery part is the transformer T-SC-1 on >>>> the parts list - it looks like a custom order. I don't know how to >>>> characterise it without destructively pulling it apart, and unfortunately >>>> they don't sell them separately. >>>> >>>> There's another four without the tube now listed: >>>> https://www.ebay.co.uk/itm/265151344483 >>>> >>>> The kit is listed as configured for 8SJ31J by default, and the >>>> documentation linked further up lists the wiring for 3SJ1J/5SJ38J/7SJ32J. >>>> No idea if the power requirements differ and requires resistors changing >>>> on >>>> the circuitboard(s), or if they are plug-and-pray drop-in replacements >>>> once >>>> you've changed the pinout. >>>> >>>> The auction page says it can be used with >>>> 3LO1I/7SJ33J/8SJ31D/8SJ40/8SJ42J/8SJ40D/9SJ105Y14/12SJ102J/13SJ38J/13SJ38D. >>>> >>>> Unfortunately without knowing the transformer operating characteristics >>>> I'd be hesitant to plug in anything else. >>>> >>>> I'll probably try to replace the fuses with polyfuses in the future, >>>> socketing them for now, and taking measurements while unpopulated for >>>> easier case design later. >>>> >>>> >>>> On Wednesday, 28 April 2021 at 20:25:12 UTC+1 John Snow wrote: >>>> >>>>> Huh, ebay auction says 12V 5A, a previous aliexpress page gives much >>>>> lower values for amperage: >>>>> >>>>> https://www.aliexpress.com/item/4001142939399.html >>>>> >>>>> I'm assuming it's the same design from the pictures >>>>> >>>>> On Wednesday, 28 April 2021 at 20:18:53 UTC+1 John Snow wrote: >>>>> >>>>>> The kit was previously 'avalible' from aliexpress for £56.44, but it >>>>>> was from a seller that held no stock - got refunded as unable to ship. >>>>>> >>>>>> That was minus the tube though, the current ebay link includes the >>>>>> 8SJ31J but lacks a power supply (12V 5A centre+) >>>>>> >>>>>> Unsure on lifespan of tube. >>>>>> >>>>>> On Wednesday, 28 April 2021 at 19:46:03 UTC+1 Paul Andrews wrote: >>>>>> >>>>>>> They actually seem very cheap to me... >>>>>>> >>>>>>> On Wednesday, April 28, 2021 at 12:56:00 PM UTC-4 John Snow wrote: >>>>>>> >>>>>>>> There's another 4 of the 8SJ31J kits listed at >>>>>>>> https://www.ebay.co.uk/itm/265139148431 , I've ordered one on the >>>>>>>> offchance they have them in stock, also the seller has feedback for >>>>>>>> selling >>>>>>>> them previously. >>>>>>>> >>>>>>>> Bit of a premium tho, and only avalible with tube. >>>>>>>> On Wednesday, 16 December 2020 at 11:40:02 UTC Collin Smith wrote: >>>>>>>> >>>>>>>>> Have you looked at these kits? >>>>>>>>> >>>>>>>>> https://oscilloscopeclocknixiecrt.com/Kit.htm >>>>>>>>> >>>>>>>>> >>>>>>>>> Sent from my iPhone >>>>>>>>> >>>>>>>>> On Dec 16, 2020, at 00:17, John Snow <[email protected]> wrote: >>>>>>>>> >>>>>>>>> I've tried to get that one from Aliexpress previously, but they >>>>>>>>> later refunded me saying they weren't getting any more stock. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Friday, 11 December 2020 at 21:42:35 UTC Pramanicin wrote: >>>>>>>>> >>>>>>>>>> Did anyone else on the list buy one of those recent CRT clock >>>>>>>>>> kits that was listed on eBay? >>>>>>>>>> >>>>>>>>>> like this one... >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> https://www.aliexpress.com/item/4001330655526.html?spm=a2g0s.9042311.0.0.1a084c4d8VxYDr >>>>>>>>>> >>>>>>>>>> I have a kit, but they never shipped the instructions, so if >>>>>>>>>> anyone has some that would be great. >>>>>>>>>> >>>>>>>>>> Thx, >>>>>>>>>> >>>>>>>>>> Nick >>>>>>>>>> >>>>>>>>> -- >>>>>>>>> >>>>>>>>> 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/3aacb083-5cbf-4b96-96ee-6e8e13744159n%40googlegroups.com >>>>>>>>> >>>>>>>>> <https://groups.google.com/d/msgid/neonixie-l/3aacb083-5cbf-4b96-96ee-6e8e13744159n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>>>> . >>>>>>>>> >>>>>>>>> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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