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Picking up FM radio on Randall RGT100
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<blockquote data-quote="kc2eeb" data-source="post: 57306" data-attributes="member: 811"><p>Usually it's an AM station that amps pick up. The most common, but hard to find cause is a cold solder joint. Without getting too technical, a cold solder joint acts a semi-conductor junction, and rectifies an AC signal. (Not talking about your ac line cord.) In radio speak, a detector. It produces a audio signal from rf (the radio station) and amplifies it along with the guitar. A quick check to isolate were in the amp it's coming from,</p><p>If you have separate gain, drive and master controls, first, turn the gain, or drive down, and the master up and see if you still get it. Then try the gain. Also, try the individual tone controls. It's odd that it's an FM (frequency modulation) station since simple rectification won't demodulate (turn into audio) an FM signal. You can install bypass caps on both sides of the AC line cord, have your tech do it, which are usually .005mfd @ 600V ceramic disk, which will pass RF to ground and stop your line cord from being an antenna.</p></blockquote><p></p>
[QUOTE="kc2eeb, post: 57306, member: 811"] Usually it's an AM station that amps pick up. The most common, but hard to find cause is a cold solder joint. Without getting too technical, a cold solder joint acts a semi-conductor junction, and rectifies an AC signal. (Not talking about your ac line cord.) In radio speak, a detector. It produces a audio signal from rf (the radio station) and amplifies it along with the guitar. A quick check to isolate were in the amp it's coming from, If you have separate gain, drive and master controls, first, turn the gain, or drive down, and the master up and see if you still get it. Then try the gain. Also, try the individual tone controls. It's odd that it's an FM (frequency modulation) station since simple rectification won't demodulate (turn into audio) an FM signal. You can install bypass caps on both sides of the AC line cord, have your tech do it, which are usually .005mfd @ 600V ceramic disk, which will pass RF to ground and stop your line cord from being an antenna. [/QUOTE]
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Picking up FM radio on Randall RGT100
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