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Planet Analog - Avoiding op amp "motor boating" (also ...

https://www.planetanalog.com/avoiding-op-amp-motor-boating-also-known-as-inadvertent-positive-feedback/

Haven't heard it for a while, but old audio amps used to “motorboat” when you didn't bypass things well enough and got inadvertent positive feedback. Dr. T: So they called it “motor boating” because it “sunk” the amp? That seems strange. Dave: Well, actually, it made the amp sound like a little two-cycle engine. You know, “putt putt putt”, like my little boat did before …

My amp is motorboating, improve it with b+ regulator ...

https://www.diyaudio.com/community/threads/my-amp-is-motorboating-improve-it-with-b-regulator.211329/

i think the 21st Century Maida Regulator thread on DIY Audio. ... However, before changing to a regulator, let's fix your amp. As Jan points out, the motor boating and squeeging are caused by instability in the circuit. yurgs said: i would need about 144mA each side for bias.

Question- amp motorboating | The Gear Page

https://www.thegearpage.net/board/index.php?threads/question-amp-motorboating.1309997/

When I put the amp up on my test bench, and turned it on, there was no motorboating in either the clean or drive channel. So I pulled V1 (NOS JAN 12AY70, cleaned the pins and stuck it back in. Still no motorboating. I then pulled that tube and put a EH 12AY7 in V1 (after cleaning the pins) and the amp began to motor boat.

What causes "Motorboating"? | Telecaster Guitar Forum

https://www.tdpri.com/threads/what-causes-motorboating.210392/

Motorboating is what happens when an electronic audio circuit, designed to operate at frequencies between 30 cycles per second (nowadays 1 cycle per second is referred to as a "Hertz"--named after some guy named Hertz, obviously, who figured out this stuff.

Tube Amp Motorboating - YouTube

https://www.youtube.com/watch?v=ThtE2hAuiIk

Thanks Aart!This video includes a sound clip of motor-boating and discusses how to fix the problem. The problem is generally found in single-ended tube amps ...

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