Thanks for information! Do you still own the synchrometer? Would you like to share a photo? The ML387 bulbs seem to be drop in replacements. I've looked at them through macro lenses and measured outside dimensions - it is exact copy. There is only one, very slight difference - one of the leads, the one on back end of the bulb is rounded, while original ones seem to have it a little bit squashed. It might affect indicators in which the bulb isn't held through a spring contact, but in my M18 type it is not a problem. Original bulbs have indication on them and it reads: GI727 28V 40mA. I think I saw some other replacement types from other distributors, but as I use mainly TME I just slipped few experimental bulbs into regular order. Right now I have 50 of those and hopefully they will last for some time! After replacing the damaged bulbs I can't notice a difference between original and new.
W dniu wtorek, 18 września 2018 11:50:41 UTC+2 użytkownik Dave Brown napisał: > > I think the KGM unit is very like the displays used in the GR 1123A > synchronometer- I will check my manual tomorrow. It may actually be the > same. I am particularly interested in the ‘equivalent’ bulb type- I need > some! > > DaveB, NZ > > PS – just rememberd- these are why I originally joined the group! Here’s > my 2006 post- > > > > “Looking for information on the IND-1803 Numerik Indicator. > > This is an old and unusual numeric display device that was used by GR > (General Radio) in some instruments they produced in the late 1960s/early > 1970s. These devices were made in England by KGM Electronics Ltd (No idea > who they are) for GR. > > The device uses an array of small incandesent lamps, of the type that was > often found in instrument panels, pre-LEDs, and has a lamp per displayed > digit (0-9) plus two more for the right hand and left hand side decimal > points. The lamps are of course all replaceable by extraction from the rear > of the module. Inside these things there's a multiple lightpipe > arrangement that I dont know details of (not been game to open one up-yet!) > that transfers the light from the illuminated lamp to a well formed digit > near the front that is made up of multiple dots of light. The digits are > layered in much the same manner as the multiple cathodes in a nixie. The > whole thing is designed to clip into a 'socket' that has a spring loaded > contact for each lamps centre contact plus a common one for the metal base > plate the lamps are mounted on at the back of the module. The module itself > is approx 60mm high, 55 mm deep and 25 mm wide-i.e. roughly an inch of > display width per digit. > > I'l organise some pictures of these things in a day or so, but I'm > interested to find out more about the devlopment and other background to > these rather unusual display devices. If anyone can give me more info on > these things or point me to a source of same I'd appreciate it.” > > > > So it’s not the same but very similar. I got 2 replys back then! Text > follows- > > ***** > > Info on their history and development is scarce, but we have photos of > several different styles here in our Photos section: > > <http://ph.groups.yahoo.com/group/NEONIXIE-L/photos/browse/2b13> > > > > (I still need to figure out what to do about the last couple of pages of > albums - should I do some more consolidating, or just clean up the titles > to make them more readable but leave them basically as-is?) > > > > A.J. > > > > Those are edge-lit readouts. Here are a couple photos of the IND-0300: > > > > http://home.comcast.net/~cwebster68/edgelit1.jpg > > http://home.comcast.net/~cwebster68/edgelit2.jpg > > > > > > - Chris W. > > *** > > > > Dave Brown > > Christchurch, NZ > > > > *From:* neoni...@googlegroups.com <javascript:> [mailto: > neoni...@googlegroups.com <javascript:>] *On Behalf Of *Tomasz Kowalczyk > *Sent:* Tuesday, September 18, 2018 19:56 > *To:* neonixie-l > *Subject:* [neonixie-l] Edge lit displays identification help needed > > > > Hi, I've recently came across two sets of edge lit displays. They weren't > hard to figure how to power them up, however I'd like to know more about > them - I always like to have a datasheet of something I own. The problem is > there isn't much written on them. > > > > Both types are powered up with 28V, 40mA bulbs. I found that ML387 (link > below) are compatible with original - which was crucial, as about 10-20% of > original bulbs were not working. > > > https://www.tme.eu/gb/details/lamp-ml387/light-sources-lighting/brightmaster/ > > There are two types - first one is a bit bigger and has bent acrylic > lightguides, with all the bulbs being hidden in the back. On the piece of > PCB in the back there is written KGM M18, which leads me to conclusion, > that it is a part of series already known to the internet and its full name > would be: KGM Multi-Indicator Type M18. I cannot be sure, though. > > They can display numbers from 0 to 9. > > [image: IMG_20180902_192635.jpg] > > [image: IMG_20180903_121812.jpg] > > [image: IMG_20180903_164557.jpg] > > > > The second type is much smaller - that's because the lightguides are not > bent at all, which greatly cuts space needed. There isn't much I can guess > about their name, though - on few of them there is written HARWIN on the > side and thats all I know for now. They are also pain in the ass to put > back together after disassembling. > > They can display numbers 0 to 9 and also a left hand dot and right hand > decimal point. > > [image: IMG_20180902_183922.jpg] > > [image: IMG_20180917_155712.jpg] > > > > > > > > So, does anyone know more about them? Every bit of information will be > useful to me. > > > > -- > 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 neonixie-l+...@googlegroups.com <javascript:>. > To post to this group, send email to neoni...@googlegroups.com > <javascript:>. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/7853dcb3-8ebf-4c61-826b-35b003406dc1%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/7853dcb3-8ebf-4c61-826b-35b003406dc1%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- 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 neonixie-l+unsubscr...@googlegroups.com. 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