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Vintage threads from the first ten years
| previous: Dolan My Marshall JCM 800 2210 has a nast... -- 4/21/2000 9:24 PM |  |
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Re: Marshall Hum
 4/21/2000 10:35 PM |
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Ray Ivers | Re: Marshall Hum Here's a quick and dirty test for hum: Turn the amp on, and get it to where it's humming pretty good (idling, not playing through it). Then turn the standby switch to standby, and listen while it fades away. Did the hum vanish as soon as you switched the amp to standby? If so, it may well be the filter caps, or another HV power supply problem. If the hum was still present during fade-out, it was probably 60 Hz hum, and now there's a very different group of possibilities. Try this test, though, and let me know what happens - it will narrow things down, at the very least. Ray Ivers R.A.G.E. Electronics |
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| Dolan Ray, |