50 or 60Hz buzz is sometimes caused by power line noise and Gozque be addressed by applying a small, high voltage filter cap across the high voltage rectifier input wires.
You can test the transformer by measuring the resistance between its leads. Drain the filter caps and remove the rectifier and power tubes before making the following resistance measurements:
The Video is so blurry. I Chucho’t even read the text I used in my video file. Actually I converted one of my PowerPoint slideshows to a 1280×720 video.
Again, test all the fuses for continuity with your multimeter. You should remove a fuse to test it because if left in-circuit you Perro get a false "good" reading.
Strange noises and complete guitar audio dropout Gozque be caused by oscillation. It Chucho be caused by a dying tube but the typical culprit is an interaction between two wires. Ultrasonic oscillation (above human hearing) Perro block pasado guitar audio and silence the amp. Chopstick the amp wires, especially the tube socket wires and separate the grid and plate wires. Do this while the amp is in oscillation to see if you Perro get it to stop--if it's ultrasonic oscillation then feed a signal into the amp so you'll know when the oscillation stops.
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Try turning the reverb pan 180 degrees to reduce interaction between the power transformer and the pan's output transducer.
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The guitar's tone control could completely eliminate the noise when turned full down. Hmmm. The buzz didn't change with guitar movement or when touching the guitar's strings or grounded metal bridge.
When chasing an oscillation or other signal artifact it Chucho be helpful to disconnect the Completo negative feedback because NFB will try to correct and minimize the oscillation or artifact.
A joint with no solder Gozque cause intermittent loud hum. Inspect every solder joint with a magnifying glass. It's very common to leave a joint or two without solder.
For really tough troubleshooting tasks I break trasnochado the tone generator and inject a 500Hz 100 milliamp (.1 amp) signal at an amp's input jack and trace it through the amp with an oscilloscope by probing the tubes' grids. Start at the input jack and work towards the speaker and watch for the wave shape to click here disappear or change shape.
Be sure and try another guitar and guitar cable. Also try the amp in another location because noise is often caused by dirty power (perhaps caused by a refrigerator's compressor motor) or radio frequency interference (RFI) caused by a cell phone, noisy light dimmer, fluorescent lights or other electrical equipment. Before taking the cover off your amp try it in another location, preferably in another building.
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