Hi group. I'm not familiar with the specifics of AF transformers, but you may want to check on the following. If the transformer is solidly mounted to the cabinet, any noise it makes will be magnified by the cabinet. Remount it using rubber grommets through the mounting holes. No part of the mounting screws or transformer itself can touch any part of the metal cabinet. Also, look and see how the wire windings on the transformer itself are wrapped. Sometimes if the wires got kinked, or the epoxy got knocked off, they can vibrate where they touch. Also look at the plates themselves. If there are any spaces between them, are any bent and touching each other? Also, if they have the old style rectifiers with the large plates, are they secure, not touching, etc. As a last resort, you can always take the transformer apart, coat everything with epoxy, and rewrap the wires around the plates. (But, that would be a job I wouldn't want to do). Hope it helps. Barry.
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