Mouser and its competitor Digikey are both large and well established electronic parts distributors. They may have a minimum order, or a service charge for very small orders, but if so it's probably something modest like $25. And you can go to them for pretty much every electronic part you might ever want, at least if it's current production. I'm not sure about tubes, but apart from that... I've used them both, Digikey more often. Excellent outfits. 28V lightbulbs should be readily available, after all 28V is standard DC power in airplanes. paul

Today I received copies of the schematic and parts layout for the Nova 3 panel from Peter Simpson. I believe Perer also sent a copy to bitsavers. Thanks Peter!! The correct part number for the bulbs is 014-000002, which makes it a CM2176 equivalent. The CM2176 has only a 1000 hour expected lifetime. Reviewing the specs for the CM2185 and CM2187 which were proposed as replacements, the CM2187 is the better fit. Both bulbs would be noticeably dimmer than the originals, with the CM2187 about 34% as bright. The CM2187 bulbs powered by 24V can be expected to last 44+ thousand hours. If a bright bulb is desired, the CM8361 is closer, but it would draw 60 mA instead of the 50 mA of the original bulb. (Even so, it would still be only 76% as bright as the original.) Mouser also has the JKL version of the CM7001, which has the correct electrical and brightness specs, but is a bi-pin bulb, rather than wire terminal. (Also only lasts 2000 hours.) Hope this is helping. Vince