3/24/2023 0 Comments Buzz brush keyboard cleaner![]() ![]() Any dust that is floating around the inside of the keyboard can land on the reed bar and induce noise. If the inside of your keyboard is dirty, every time you move or even play it, you risk kicking up dust. How do I fix a shorted reed bar? If you haven’t already, you should remove everything from the interior of your Wurlitzer and clean it very well. If the short is severe enough, the Wurlitzer won’t make any sound at all. Or, occasionally, the reed screw can be loose, causing the reed itself to rotate and touch the pickup. The debris can be anywhere across the reed bar, and it can be very difficult to spot without a magnifying glass. How can the reed bar become shorted? Usually, the cause of the short is a small piece of debris that is connecting the reed to the pickup. Occasionally, reed bar noise manifests as a low-level whine. if the reed bar becomes shorted, you’ll hear loud pops and crackles. The vibration in the reed induces a signal voltage in the pickup, which is ultimately amplified by the onboard amplifier. It’s basically a capacitor: the reed is one conductive plate, the pickup is the other, and the air gap between them acts as an insulator. The Wurlitzer has an electrostatic reed bar, which requires a polarizing voltage to work. Popping and Crackling in the Reed BarĪlthough the pops and crackles might sound electronic, they are usually caused by a piece of debris shorting the reed bar. In this article, we’ll describe how to address this problem. ![]() It is most commonly caused by a deteriorated carbon composition resistor. However, low-level crackling, popping, or sizzling sounds can also originate in the amplifier. Apparently, this was a problem even in brand-new Wurlitzers, because it is mentioned in the service manual in the context of troubleshooting new keyboards. It is more likely to occur after a keyboard has been moved, so it is something to watch out for any time a Wurlitzer is transported from one place to another. But, because even a tiny particle of dust can be enough to bridge the pickup, even recently cleaned Wurlitzers can suffer from it as well. Reed bar noise is more likely to happen in a dirty, neglected Wurlitzer. This is very common and mostly harmless to the amplifier. Although they may sound dramatic, they’re most often caused by debris in the reed bar. Popping and crackling sounds are a very common problem in Wurlitzer keyboards. ![]()
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