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Well, there are several things that can be done. If you have a blue glow inside
the plate, it's gassy and will cause noise. (Outside the plate is okay.) If you tap it, holding the top with a finger of one hand and flicking it, using thumb and index finger of the other hand, look for sparking around the cathode (and listen for a static like noise). The tube could be intermittently leaky, even shorting. Listen for a "bonging"sound. Although this won't affect performance too much, it -- a microphonic -- could interfere with decent reception of strong signals. If the filament goes on and off, it, and a static noise without a shorting indication, most likely would indicate a bad socket contact. Short of replacing the socket, get a paper clip, straighten part of it, and cut barbs into the straightened part, scattering the barbs around the wire, preferably pointing out (up) so that they scrape any crud when the wire is removed. Then work the clip's wire in and out of each socket pin. The clip's wire should be the same diameter as the tube's pins. Unless there's a lot of crud in the pins, spray cleaning doesn't help much. Sometimes a socket's pins will spread and lose tension. Take a scribe and squeeze the two halves of each pin closer together. Clean them first, though. 73, Bill, K5BY |
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