How to stop waterboarding

It was "motor boating" (lf oscillating)

Cheers George

So"....... I changed the rectifier tube 5r4gb instead of 5u4 on the..line stage The 5r4 draws less voltage to work properly and the “thumping stopped immediately.
 Cheers everyone!! Steve OP

powder1 OP
three_easy_payments
I suspect OP means "motorboating" which admittedly is a form of torture to the ears.

 I think your correct, "motor boating" is the term, a form of low frequency oscillation, it can be had with tube amps. It can also be a condition of air born LF feedback back to a vinyl turntable.

Which out of these do you have powder1 Tube or vinyl?????????


Cheers George

Happy hunting OP..

Regards

I thought they did that in Iraq.

For all that replied to my quandary I am appreciative. Heck-2 months ago I tested positive for cOvid 19 and was asymptomatic.,so as a 65 year old man I certainly know gratitude. OP

“Water boarding is a term in audio when to many items r hooked up to the same AC line feeding it a nd u get this repetitive bass thumpthru your speaks. If I get my preamp off the same line as my amps——it stops but running power cords that long is difficult for me. I thought that perhaps the Torus line of power conditioners might be the answer account these achieve a perfect 117 volt signal all the time. I think I’ll try these and let you know. I use tube mono amps and I believe it is the trannys that r hunting for  a 117 volt source.. OP

I suspect OP means "motorboating" which admittedly is a form of torture to the ears.  I experienced this once and it was due to my router being in close proximity to toroidal transformers.  Problem instantly solved when I moved the router about 8 feet from the rack. 

Do you mean motor-boating?

I’ve been waterboarded on this forum a bunch of times.  

I've never heard the term, with regards to stereo gear. Waterboarding? I'd like to understand. Gosh hope it's nothing you've personally gone through..

Noise is usually routing, or ground loop issues, but you're a little light on details.  Do you hear it through all the drivers or just the bass section you reference? Like E said, what's on, when it happens?

Regards

Hey powder,

You can get a power condition with a "voltage regulator" however, those fixes are kind of coarse and probably not related to the issue you are having.

Here's an example:

https://amzn.to/3cHrepu

However, without understanding your system better I don't think this is a solution for you. 

Is this happening with all inputs? Vinyl or digital?

What exactly does this sound like?  Like a motorboat?