My tube amp power supply is buzzing away Help

My tube amp - Mcalister Audio has an outboard power supply that buzzes quite loud. Not through the speakers, but the unit itself makes a buzzing noise I can hear 15 feet back - very obvious.

I have read there is some material you can buy to place under the transformer to help. The transformer does not seem well mounted - kind of lose. Can anyone tell me the name of the anti-vibration stuff and where to buy it. I think I am going to tweak it before calling the manu to replace.


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.

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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 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.
Thanks Scompracer. My method is more crude and I my try yours. Funny thing is my bottom plate was also bent from shipping. I love the sound of this amp. Have you found tube rolling helps or changes the sound. The amp has very detailed highs and good sparkle and killer transparancy. Is that what you find?

Bass is very tight and fast. The mids are not as ripe as my past CJ MV60 amp and I did like that about the CJ. The PP150S beats the CJ in every other area of sound in my system. Great amp!
Scompracer, I did the mod the exact way you outlined and the results were fantastic. Wow! Most pleased. I am going to do the same thing for the transformer in my Powervar line conditioner as it also makes some noise.