![]() ![]() On this page we will decode some of the terminology you might hear around the microwave lab (or on this web site), a must-read for microwave neophytes and managers alike. The next time it motorboats is there anyway i can troubleshoot while the amp is on and making the noise? I've tried to include as much relevant info as possible so sorry if it's long winded Any advice is welcome.Click here to read some engineering jokes we have compiled A couple of small pieces if velcro on the lip of the chassis solved most of the rattle). The only other thing that has been done lately is the chassis was pulled to solve a vibration rattle issue(The chassis was vibrating against the screen mesh on the top. From what I've read it's most likely a cathode bypass cap that has drifted out of spec right? Can tubes cause a motorboating sound( I promise it really is a motorbating sound ? Since it's an intermittent issue tube swapping to see if it's gone will be pretty difficult. The amps electolytic, and filter caps were replaced when I bought it. I've been doing a lot of preamp tube swapping lately but the tubes in it now are the ones that have been solid for awhile. I changed my phase inverter about a month ago from a Mullard 4024 to a Blackburn Mullard ecc81. If it is a tube then it's causing a motorboating issue. My questions are this, can tubes cause motorboating? I've had the amp for about 4-5 years now and have become quite familiar with what a microphonic tubes sounds like. When he heard it he said it was definitely motorboating. He's built his own 5f4 clone and does most of his own amp repairs. ![]() The other guitarist in my band is pretty knowledgeable with amps. I hit the standby and again it was gone when I flipped it back on. Tonight about a week and a half later I was at band practice and when we finished a tune it started doing it again. ![]() ![]() I hit the standby switch turned it back on and it was gone. About a week ago I was playing at home and all the sudden I hear a loud putting sound that started in one pitch and then wound down to a lower pitch and kept put putting in the same pitch. ![]()
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