This week I completed my Kaiju 300B Stereo Amplifier. All in one time okay and the sound is really better than the previously built Smash - Seductor combination. During the assembly and during the first volt measurements the PT-9 power transformer showed a big hum.
Now that the Kaiju is ready and connected, this annoying hum is still present. The hum comes above low music passages and can then be heard well.
I have completely checked the mounting of the transformer and all lockwashers, screws, shoulder washers and locknuts are properly mounted.
All measured voltage levels corresponded to the specified levels.
And again, the sound is great.
What can I do to get this hum (more mechanically) out of the transfomator?