Here is a rare find indeed. A three PC board assembly containing 8 Burroughs B-4998 Nixie tubes, 8 sockets, 8 SN7441AN ICs and 8 ICs marked F930059 MS19917. The entire assembly is presumed to be used and removed from equipment, there is no apparent physical damage. These tubes are the smallest mass produced Nixie tubes and are extremely hard to find. These little tubes are often used in such projects as the Nixie wristwatch.
Well, again, eBay seller Potomac Metals Inc has a really cool piece of hardware up for auction. This time it is a 5 digit dekatron counter based on the Sylvania 6476. It looks like some of the original electronics may be missing; this may be only the display end of the device. Either way, this is a great little gadget
Up for auction is a vintage Dekatron Counter Display with 5x Sylvania 6476 Tubes. This display is like a nixie display but instead of numbers there are just dots that correspond to numbers on the front panel, in this case 0-9. These tubes are not tested because we do not have anything to hook this up to but all of the tubes are intact and in good condition. There are a couple screws and bolts missing that connect the chasis to the front panel. You could really use any bolt/nut combination that fits. They should not be hard to replace at all.
The 6476 tube is a Bi-directional double-pulse decimal counting tube filled with neon to produce a bright orange color. Check out below for all the specs on this tube.
- Tube type: 6476
- Brand: Sylvania
- Substitutes: 6476A, CK6476
- Counting direction: bidirectional
- Operation: double pulse
- Sort: SEL
- Base: B12E
- Socket: B12E
- Zero position: pin12
- Counting steps: 10
- Number of guides: 2
- Gas filling: Neon
- Tube diameter max.: 37,2364
- Tube height max.: 96,139
- Max. counting speed: 4
- Supply volt. min.: 350
- Supply volt. typ.: 400
- Maintaining voltage typ.: 191
- Anode/cath. current typ.: 445
- Anode/cath. current max.: 600
- Anode resistor typical: 470 (820)
- Voltage between 2 cathodes max.: 140
- Cathode resistor typical: 68 (100)
- Output voltage: 28 (30)
- PIN 01: K0
- PIN 02: K9
- PIN 03: K8
- PIN 04: K7
- PIN 05: K6
- PIN 06: K5
- PIN 07: K4
- PIN 08: K3
- PIN 09: K2
- PIN 10: K1
- PIN 11: G2
- PIN 12: G1
- center cap: A
Up for auction is a vintage Kintel Model 471 Digital Projection Display or Clock similar to the Nixie tube displays and clocks out there only much more rare. This display has Industrial Electronic Engineers (IEE) company one plane display units. This display comes from the 50's and was used in some type of test equipment. It uses incandescent lights focused on a small character pane that is then projected using a lens onto the larger front display panel. For a better detailed description of how this technology works search for the patent number 3041600.
The great thing about this display is that you can completely customize it and update it to use custom lights or LED bulbs. Maybe even RGB LEDs for a really fancy display. This display was tested by shining an LED down into the bulb holes and all of the characters lit up properly. A couple of the incandescent bulbs are missing. We have not tested any of the incandescent bulbs or the circuitry but it is very straightforward and anyone with an understanding of simple electronics should be able to test the electronics easily. To get this to function as a clock will require a greater understanding of electronics and additional drivers and boards.
This display is made from aluminum and has a plastic front. It is setup to fit a standard 19 inch rack. There are 5 characters, 1 that displays units (ohm, kilo ohm, +/-, nn) and 4 characters display the numbers (0-9 and a decimal point). There are not many of these around. There are people who have reproduced them but nothing stands up to the original design. Check out all the pics, we have taken it apart to show the inner workings.
Here is a tv camera tube that has a fixed internal image that appears to be the complete ASCII standard character set. This tube is in original box which had that foam that turns to red goo and it has seriously corroded the base pins. The remainder of the tube is in great shape and appears to be unused. There is a final test sheet, very faded with it showing test conditions etc. I believe that special chemical treatment will recover usability of the base pins but not guaranteed. They are not bent or broken.