My tube amp power supply is buzzing away Help

Before you do anything, try tightening the transformer down. You may find you need to go no further. And, if the design is not great, look into fixing THAT first.

Trying these other products is good, but unless you first batten down the hatches, you are surely putting a band - aid on the real issue, and your results will not be maximized.

There are a few things that might work, first off check the nuts and bolts connecting the power supply to the chassis as I had a bit of hum in an amp and by tightening the nut just a tiny bit did away with the hum completely as I think over time they work there way loose. One other thing as mentioned above is the Humbuster. If the hum is in the component and not coming through the speakers it's most likely dc on the line.

I fixed the issue by buying a $5 hard rubber bunge and cutting into strips and placing it under the transformer. I then tightened the whole thing down.Now it is much more quiet. Cant hear it from where I sit.

Neat way to qiet down transformers.

Bill

I have a McAlister PP150S amp. My power supply appeared to have been handled roughly as the bottom panel was bent. This magnified the induction noise from the power supply when I first powered it on.

I removed the panel and straightend it. Then I installed four neoprene isolation mounts under the transformer. These are small, cylindrical mounts with a stud in each end. The mounts prevent most of the vibration from being transmitted to the chassis. This modification required adding a jumper ground wire from the transformer frame to the chassis since the neoprene mounts act as insulators.

These mounts are available from McMaster-Carr, part number 9376K114. Go here http://www.mcmaster.com/ and type the part number in the "Find" box. They are available in 1/4"-20 USS thread and M6 X 1 metric thread. They cost $1.39 US each and are 1/2" high. I had to enlarge the holes in the transformer and lower panel for the 1/4" USS thread studs. Metric would have been a better choice, but I had a supply of 1/4" USS nuts/washers.

I also put some dynamat on the inside of the top/bottom/front panels. I did not block the side air vent slots. These mods resulted in a considerable reduction in the inductance hum.

I suggested he work on better packaging in the future that would support the underside of that heavy power transformer. Despite having to go through this mod, I remain very pleased with the sound from this amp.