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1086 Module Crackling & Popping
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<blockquote data-quote="RD/MAN" data-source="post: 4677" data-attributes="member: 61"><p>Guys,</p><p></p><p>The early crackling noise in blackface, Clean, and Deluxe which was identified and fixed back in 2003 was not related to the tubes. If you have any early version of these modules you should check the resistor value at position R1 to see if it is 150 ohm. (brown/green/brown stripes)</p><p></p><p>150 ohm is correct, but the original value was 470 ohm which caused the module to distort a bit up front. </p><p></p><p>Crackling in any other module will most likely be related to a bad preamp tube or even the first gain stage tube located on the chassis. If you have a module that is still crackling after changing the tubes then try changing the preamp tube located on the chassis nearest to the front panel input jack. This tube will also need changed periodically as it's the first gain stage for all of the modules. </p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="RD/MAN, post: 4677, member: 61"] Guys, The early crackling noise in blackface, Clean, and Deluxe which was identified and fixed back in 2003 was not related to the tubes. If you have any early version of these modules you should check the resistor value at position R1 to see if it is 150 ohm. (brown/green/brown stripes) 150 ohm is correct, but the original value was 470 ohm which caused the module to distort a bit up front. Crackling in any other module will most likely be related to a bad preamp tube or even the first gain stage tube located on the chassis. If you have a module that is still crackling after changing the tubes then try changing the preamp tube located on the chassis nearest to the front panel input jack. This tube will also need changed periodically as it's the first gain stage for all of the modules. Hope this helps. [/QUOTE]
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Modular Amps
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1086 Module Crackling & Popping
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