- 1). Remove the old tube. Most radio tubes slide in and out easily, much like a fuse. Simply pinch the top of the tube and pull it straight up, perpendicular from the surface of the radio. If your tube does not come out easily, take the radio to an antique dealer for help. Do not try forcing the tube out, or you might accidentally crack the glass tube and injure yourself.
- 2). Inspect the old tube to determine the specific brand and model of the tube. Most tubes will contain small writing on the tube's glass casing. Locate the brand name and the four-digit model number. In some cases, the tube will feature two four-digit model numbers, each separated by a backslash; this simply means that the tube doubles as a fill-in or replica for a different, similar model.
- 3). Visit an antique shop, preferably one specializing in vintage electronic devices to locate a new tube. Some niche record stores also carry replicas of old radio tubes. A shop will always be your best bet for finding the right tube because you can physically bring in the old tube and compare it to the shop's inventory for a perfect match. Even when you're purchasing a new tube with the same brand and model number, physically comparing the tubes is always a good strategy for ensuring the correct fit.
- 4). Inspect the tube to make sure it is in good condition; this step applies only to used tubes, as new tubes or replicas will always be in good condition. Any blackening on the tube's glass is an indicator of poor condition. You want to find a tube with perfectly clear glass.
- 5). Consult online sellers if you cannot locate a suitable replacement locally. Websites such as TheTubeStore.com and OldRadioParts.com offer tubes for popular vintage radios (see Resources).
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