Subharmonic Rumble of Channel 3 and 4

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the prophet 5150

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Hi,

My odyssey of things being wrong with my VH4 continues!

After some great help I received to tame the fizz of channel 2 issue, which led me to revalve everything, rebias and buy a power conditioner...

I now have a subharmonic rumble on channel 3 and 4. Deep control all the way off, bass all the way down and a variety of guitars - even low output single coils and it is still there.

So to try and deal with the subharmonic issue, I have again retubed and rebiased and it is still there.

Not audible on chords - but on lead lines it is like a sustained woof noise like you would get from a nondescript note being played through a sub-woofer.

It is there in cabs and through my ox, and through a suhr ir box.

I am not sure what is left to try. Any help appreciated.
 
Could you record from the send output of the preamp showing the issue and the exact same guitar dry so I could check?
 
It would be no odyssey if we can find a skilled tech.

For me it sounds like a bad filter cap.

Best regards,
Peter
 
Peter Diezel":1csfy67q said:
It would be no odyssey if we can find a skilled tech.

For me it sounds like a bad filter cap.

Best regards,
Peter
Click to expand...

Hi Peter, you can hear the effect in the clip above with the cabinet. Cheers, Greg
 
Peter Diezel":3pf7ya0l said:
Please check the filter caps.

Thanks,
Peter
Click to expand...

Hi, is there a test I can do on them, or do I just need to research what to buy and put some new ones in to find out?

Thanks again,
Greg
 
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