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Vintage threads from the first ten years
Fender Bassman "popping sound"
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 10/6/1999 9:51 PM |
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rb |
Fender Bassman "popping sound" What causes the slight (background noise level) "popping" sound coming out of my 1964 Fender Bassman? Actually the sound comes out of the 4X10 Marshall cab it is plugged into! The noise isn't very loud, but it is persistent. Bad filter capacitor? Any help appreciated. The amp is untouched from 1964; all original caps, tho' the filter caps don't have the nasty "bulging" typical of 35 year old caps. Thanks! |
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| 10/7/1999 8:45 PM |
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| tom | rb- could you be more specific about the popping sound? Are you talking about a regular pop-pop-pop (put-put-put?!?) or a random/intermittent POP sound? The first would be known as motorboating, while the second could be the crackle (and pop) of a bad plate load resistor. Or other things... |
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| 10/7/1999 8:49 PM |
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| Gil Ayan |
A bad filter cap will cause hum, not a popping sound. A popping sound can be caused, as suggested above, by bad plate load resistors, or bad screen grid resistors, or bad tubes, etc. The plate loads on those amps are CC some of them 1/2 watters, so the resistors may have slowly started cooking over the years. I would check than and the screen grids. Gil | |
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| 10/7/1999 10:55 PM |
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| rb |
Thanks guys! I will have the screen grid resistors and plate load resistors checked! I will also substitute tubes to see if that solves the problems; I assume this would be power tubes, and not the preamp tubes? |
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