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Post subject: 4x10 Hot Rod Deville problem...low rumble sound?
Posted: Sat Sep 21, 2013 5:31 pm
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Hobbyist
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so, I've had this 4x10 hot rod deville for about five or six years and have just recently started having problems with it. Everything sounds fine until i turn it to about 5 then i suddenly start hearing this low, vibrating, rumble sound from the speakers. I recently changed out all of the tubes and it didn't seem to make a difference. any idea what it could be?

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Post subject: Re: 4x10 Hot Rod Deville problem...low rumble sound?
Posted: Sat Sep 21, 2013 5:56 pm
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Have you changed any coupling caps, tone pots, or resistors in the signal path? It sounds like you are getting ultra-low frequency passing into the speakers. You can test this by installing a non-polar cap in series between the amp and the speakers.

To make a quick and dirty non-polar cap get two 40mfd/450VDC (or higher voltage rating) electrolytic caps. Solder the two (-) ends together. Now connect the (+) ends -- one side from the amp. The other to the speakers.

This is a simple Butterworth filter, that will have approx 6dB per octive $@!&# from 400Hz downward. Now, if the rumble goes away, you need to look at coupling caps, the tone stack, and tone pot areas of the amp.


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Post subject: Re: 4x10 Hot Rod Deville problem...low rumble sound?
Posted: Sun Sep 22, 2013 1:18 am
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Location: Natural Bridge, Virginia
Is the noise a rumble like the low frequency noise one hears on vinyl records (sounds like a subway train going by) or is it a low frequency "putt-putt" sound (motorboating)?

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